How To Install LED Light Strips In A Car

Want to add some amazing style and color to your ride? Not only can you do it yourself, but you can also get great results for less than the price of a pair of speakers!

I’m passionate about helping others so I worked hard to put together this detailed do-it-yourself (DIY) guide to show you how to install LED strip lights in a car.

Want to see what they look like before you spend the time and effort? Be sure to check out my demo video at the end.

Infographic – Car LED light facts and tips

Car LED facts and tips infographic

What are LEDs?

What is an LED illustrated diagram and examples

Light-emitting diodes (LEDs) are semiconductor components that produce light. Semiconductors are basic electronic elements made up of silicon and other elements that allow electrons (electrical current) to flow in certain ways. Diodes are “one-way valves” which allow current to flow in only one direction. An interesting property is that they also produce visible light. An anode (positive lead) connects to a positive power supply and the cathode (negative lead) connects to the ground or (-) wire. 

Light-emitting diodes (LEDs) are one of the most important components in the electronics world. They’ve been around for decades but in the last 10-15 years or so they have become increasingly useful in our everyday lives. This includes uses in both home and car lighting, too.

LEDs work on the principle of a semiconductor junction. In other words, they contain 2 different materials like silicon and germanium bonded together to form a junction – or bridge – that forms a diode.

Diodes are extremely important to the electronics world as they’re electrical one-way valves, so to speak.

That principle is the basis of microscopic transistors which are what allow microprocessors and many other modern technological miracles to work.

The tiny components like the LED chip (the semiconductor materials themselves) are very sensitive but are sealed in an extremely hard and durable epoxy housing. Wires are bonded to the tiny components for connecting power.

If you’d like to read more about the different types of LEDs check out this page.

How LEDs produce light

Diodes have a special side effect when they pass electricity – they produce light! The color of the light produced depends upon the materials used to make them.

Over the years more and more companies have improved upon them and now produce cheap, great-looking LEDs that can produce light in a variety of colors.

Unlike regular light bulbs, however, LEDs actually work on a low voltage (say around 1.5 volts or so each). This means they must be used with a resistor to limit the amount of current flowing Otherwise they burn out quickly.

Resistors are used with LEDs when powered by car voltage (normally somewhere around 12V).

LEDs vs light bulbs & neon bulb comparison

LEDs have several advantages over incandescent (filament-type) bulbs and neon tubes as well. Here’s a comparison table highlighting some of the pros and cons of the three types.

Power use Low Moderate/high Low
Cost Low Low/medium Medium/high
Voltage Low Low/as required High (special power supply)
Durability Excellent Poor/moderate Poor/moderate
Life expectancy Extremely high (tens of thousands of hours) Low/medium (hundreds of hours) Low/medium (hundreds of hours)
"Soft" glow effect Poor Fair Great

As you can see from the table, LEDs have significant advantages in nearly every category that matters. They’re more cost-effective too.

It’s not just because they’re so durable and have an extremely long useful life (in the 10, 000 of hours, typically) but also because they need a lower voltage to work.

One drawback is that they can’t reproduce the “soft glow” neon tubes can, but that’s a minor drawback overall. When done well they still look great!

How do multicolor RGB LEDs work?

Image of RGB LED example

Image showing a multicolored red-green-blue (RGB) LED up close. These LEDs are actually a combination of 3 separate red, green, and blue LEDs built together. Today’s multicolored LEDs are very tiny and some are only a few millimeters in size!

Red, green, and blue (RGB) LEDs are made of 3 separate color LED segments combined into one small package.

Just like images displayed by your computer monitor or a phone’s liquid crystal display (LCD) the colors are produced in various brightness levels to form different color combinations.

RGB LEDs have 3 connections: one for each color. By using a specially designed LED controller the 3 colors are driven at different brightness levels and various hues of colors are produced.

Of course, basic red, green, and blue colors can be produced as well. The number of variations in color and brightness you can choose from depends on the ability of the controller used.

How do LED light strips work?

How LED light strips work diagram

Diagram showing the design and basic operation of car LED light strips. The 12V supply powers the light strip controller which drives each light strip with separate red, green, and blue on/off waveforms. These waveforms are how brightness and color combinations become possible. Resistors are required to limit the amount of current each LED segment can receive.

LED light strips worked by being driven by a special power supply that controls the amount of time (and which color) LEDs switch on and off.

While simple single-color LED strips don’t need a power supply, they’re incapable of having different color combinations and special features like dimming or pulsing with music sounds.

An LED controller makes this possible in more advanced light strips by using very fast switching on/off with separate wiring for each individual RGB color.

Image of LED light strip up close

LED light strips contain an evenly spaced set of multiple RGB LEDs and resistors wired in parallel. When powered, each color receives a separate on/off signal from the LED driver controller box. This allows a variety of brightness levels and color combinations.

The longer the on time applied to an LED, the brighter it will seem to your eyes. If one color is turned on more than the others that color will appear more prominent. (For example, if blue is turned on more often than red, you’ll see a color mix with more blue in it)

Each light strip connects in parallel with other light strips by design in most light sets.

Choosing a great LED light strip set

Example of LED light strip set for car interior

Car LED light strip sets like this popular one from Amazon that I've tested are a great deal for the money and offer a lot of options including color-changing, a remote, and pulsing with your music.

Getting a good LED light set is definitely important. There are so many sold today it can become a headache when shopping!

Although you can buy a simple single-color light strip set for around $10 (like this one here) I recommended spending just a few dollars more.

My advice is to look for one with the following features:

  • Good buyer reviews and happy users
  • Fairly installer-friendly
  • Offers multi-color modes
  • Music mode to change with sound
  • Color rotation modes (gradient, fast, etc)
  • Brightness control

You don’t need to spend a lot – say $30 or less. Here’s a great example of a light strip set that does all this and more for a great price.

Instructions included with Chinese products like these can be hard to understand, so be ready for that!

Supplies, tools, and your shopping list

Inspirational example of notebook checklist

It’s really smart to make a list of what you’ll need before getting started. It only takes a few minutes and can really help you be better ready for the specifics of installing in your vehicle!

I recommend making a basic list of what you can expect to need before you begin installing LED lights in your vehicle.


  • Multimeter (for measuring voltage) – preferred over a test light
  • Crimp tool for crimp connectors
  • Screwdrivers and etc (as needed for your vehicle)
  • Wire-cutting pliers or pliers with a wire-cutting feature

Image of recommended car stereo installation tools

I highly recommend getting an inexpensive but good multimeter (left) like this best-selling budget model from Amazon and a wire crimp tool and wire crimp connectors (right) before starting your installation. You’ll get professional results and it will go much more easily, too!


  • Wire (“zip”) ties (usually sold in a bag of 100 or more), 6″ length or similar
  • Wire crimp connectors (small assortment)
  • Roll of electrical tape
  • Good quality fast-drying glue
  • Fuse tap adapters (if wiring from fusebox)

Example of LED light car interior installation supplies recommended

If you’re mounting the light strips to flat (or other material) surfaces, I really recommend using a great glue like this fantastic Gorilla super glue gel that’s easy to work with. For making your installation wiring neat or mounting lights to wires or other nearby objects, definitely pick up some small wire ties like these.

While it might not seem important now, I strongly recommend picking up a pack of wire ties. They’re incredibly useful for keeping wires held together and nice and neat.

They’re also very handy for mounting light strips to metal braces or nearby wiring (and other objects) underneath your dashboard and seats.

Installing LED lighting in your car: getting started

Image of guy looking under Mazda dashboard for LED installation

You’ll need to do just a few major steps to get your LED lights installed. The good news is that in most cases it’s not that hard! It does take a little while to do it right, but it’s well worth it!

You’ll need to plan to do the following:

  1. Wire the controller (or lights directly) to a power source of +12V and ground
  2. Mount the light strips securely
  3. Test and verify operation

In most cases, you don’t need to run any wiring to the battery. LED lights use only a relatively small amount of power so in most vehicles they can be connected to the factory stereo or cigarette lighter socket wiring.

There are also a few more sources I’ll mention later.

How to wire 12V LED lights in a car

Image of cigarette socket adapter for car LED lights

Many sets include a cigarette lighter plug with an on/off switch. While using the cigarette socket to power a set is an easy option, it’s not the best or neatest way. However, for temporary use it’s ok.

While LED car interior light sets often include a cigarette socket power plug, that’s not the best option. Ideally, you’ll want to hardwire them to turn off with the ignition switch just like the car stereo.

LED light strip wiring diagram

LED light strip wiring diagram

In order to power the set you’ll need to hardwire it to an accessory wire to get a +12V supply that switches on or off with the ignition.

You can normally find a wire that works for this in one of several places:

  • Behind the car stereo (usually the first option)
  • At the cigarette lighter socket wiring
  • At the fusebox in the vehicle interior

How do I find a +12V accessory (“ACC”) wire?

1. Look up your vehicle’s wiring colors

I recommend looking for wiring color codes for your vehicle at In most cases, you’ll find the colors and diagrams for your car or truck’s wiring.

If that doesn’t work out, it’s ok. We’ll fall back on plan #2.

2. Test wiring until you find a suitable wire

For this step, you’ll want to use a digital test meter (as I mentioned earlier). The main reason is that in modern vehicles not all wiring is 12V.  Some now have signal lines or other wiring with voltages below +12V.

Caution! A simple test light can’t show you the real wiring voltage and can cause potential problems with the vehicle. Using a test light can lead to using a lower-voltage wire by accident which can cause your LED lights to fail or never work right.

You can try removing the radio and, with the ignition in the ACC position, check wiring until you find +12V wires. Then test again with the ignition off to decide which are suitable.

3. Tap off of the fusebox

Example vehicle fusebox locations

A vehicle’s fusebox containing a power source for the radio – and your LED set – is usually in one of a few places. (Above) Under a panel in the dash itself or (below) in the lower driver’s side of near the brake pedal. The owner’s manual normally has labels for the fuses.

Additionally, another option is connecting to a power source at the fusebox. They’re typically found at the left side of the dashboard, either near the lower left-hand side of the interior or under a panel in the dashboard itself.

You can use the vehicle’s owner’s manual to show you which fuse is for what purpose. Most vehicles have one for the radio supply that you can tap power from.

Mini and micro fuse wiring adapters examples

Fusebox wiring adapters make it pretty easy to tap off of a power circuit for installing LED lights. You plug them in place of the original fuse and then connect the power wire.

If tapping off of the fuse box consider picking up a fuse wiring adapter. They can make it so simple!

If you don’t have an owner’s manual you can use a test meter to check fuse power with the ignition on and off until you find a suitable one. Then use a fuse tap adapter or other connection to attach the LED power wire.

Here are some great ones which will make installation much easier.

Connecting the wiring

Once you’ve found a suitable source for power, you’ll need to:

  • Connect the LED power wire
  • Ground the negative power wire

Here’s a helpful diagram with some ideas clearly explained.

How to hardwire car LEDs instructional diagram
Mounting your LED light strips

As many light sets (like the one I’m using here) have the light strips permanently attached to the control box, wire length is limited. However, there should be enough for most typical installations.

I measured about 48″ (122 cm) and 58″ (147 cm) for the front and rear lengths on mine. That’s about 4 ft (1.22 m) and 5.6 ft (1.7 m) in length for each front and rear pair.

Interior light strip locations

Car LED light strip interior location diagram

Diagram showing typical locations for the LED light strips in a car interior. Great locations are under the dashboard for the front 2 and either on the front or rear of the seats. Use the light strips with longer length cables in most cases.

Ideally, you’ll install your light strips (assuming you have 4, which most sets do) here:

  • Left & right front: under the dashboard, facing down
  • Left & right rear: under/on the front or rear edges of the front seats

Be sure to have them facing the areas you want the light glow to appear on.

You can also test them temporarily using some good quality tape to hold them in place before installing them permanently.

Locating the controller

Car LED light controller installation example image

The LED light set controller (for those having a remote control and/or sound sensor) needs to be accessible from the remote and should be placed where it can sense sound properly. Install it on one side of the dashboard center console where it’s hidden a bit. Most likely the driver’s side is best (as shown in the diagram above).

LED controllers that offer a remote control usually use an infrared receiver (IR) type of sensor. These need a direct line-of-site to the sensor in the control box.

Additionally, models (like the one shown here) have a sound sensor internally, too. In both cases, you’ll need to place the control box where it’s not totally covered and where the remote can work with it. Normally I suggest the driver’s side, hidden slightly underneath the dashboard.

Installing the light strips and cables (and why adhesive strips may be a bad choice)

Installing LED light strips in car interior diagram

The diagram above shows 2 great ways to install the LED light strips in your vehicle. I no longer recommend self-adhesive strips, even included on the light strips. After being exposed to heat in a car’s interior they often fail.

While LED light strips typically include a self-adhesive tape on the back of the strips, it’s often not reliable. The reason is that the adhesive fails after multiple sessions of heat exposure, vibration, and being kicked by feet in a vehicle.

For that reason I recommend the two methods I mentioned earlier:

  • Use a high-quality glue for attaching to under-dash plastic panels
  • Use wire ties to fasten light strips to vehicle wiring bundles or dashboard brackets

Using a high-quality gel super glue like Gorilla Glue is a great idea. Although it may sound permanent, you’ll only need a few small drops (about 4 to 5) for each light strip. The glue dries quickly but gel glue is easy to work with and quite strong.

Be sure to clean any surfaces beforehand with alcohol and a cloth, an alcohol pad, or a good surface cleaner. Silicon and other protective products like Armor All leave a residue that prevents glue from adhering well.

Additionally, wire ties are easy to use and allow for a lot of creative installation ideas. Nearly any nearby object or hole can be used to support a light strip.

Attaching light strips to seats

Similarly, after attaching the light strips underneath the dash, you can do the same for the seats as well.

If you’d like to avoid using a permanent glue, you can also consider using genuine Velcro. Generic velcro tends to have poor quality adhesive and won’t last long.

Where possible, try using wire ties on the seat frame if available. Wire ties are very strong yet can be cut and removed later without any permanent damage.

Spice up your system! LED amp rack lighting example

Custom car amp rack with Planet Audio amps and backlighting

Want to add some extra style and class to your system? One great idea is to use LED light strips, facing your amps, to create a cool soft light glow that looks sharp. Pictured above: My custom car amp rack I built.

In the photo above you can see my custom car amp rack with backlighting inside. LED light strips are great for your own low-cost custom amp rack too!

Just add them around your amps (for as many sides as you like or make sense for your system) with them facing the amps. It’ll add a beautiful look that you’ll be proud to show off.

In fact, you can use a simple relay connected to the remote wire & power from the amp +12V & ground terminals so they’ll come on automatically with your system.

Final notes and demo video

Car Interior LED Light Set Demo

An example of the kit installed in a Toyota sedan. The results are great!

Adding LED lights to your vehicle’s interior is a very cool project you can do yourself! The results are great and one of the most cost-effective ways to really spice up your ride.

Example of LED light strip set for car interior

As I mentioned before, a good LED light strip set won’t break the bank. In fact this multi-color car LED light strip kit I picked up from Amazon is under $20. It’s easy to install, too.

Additional reading

Speaking of taking your ride to the next level…got an amp yet? If it’s time for an upgrade, have a look at my list of the best 4 channel amps for sound quality.

Got questions, suggestions, or ideas? Feel free to comment below or send me a message.

Your comments are welcome!

  1. thats the greatest guide ive ever found. I really really appreciate people who explain everything carefully. Thanks a lot :)

  2. Hi! Nice guide! I want to install it too:) But what fuse I should use for LED’s? Did you used anything? or just putted original only? Because others are putting two fuses, one for original use and other one for LED’s.

    • Hi there, glad you like my guide! That’s a great question, actually. I’ll update the post as I’m sure other people are wondering the same as well.

      To answer:

      – Most LED sets like I showed don’t require much power and you can wire them to an existing power wire like the car’s accessory wire for the radio, a cigrette lighter/12V socket, or similar that turns off with the ignition.

      Those are already fused from the factory.

      – You can also hardware your LED set to the battery. In that case, check the amps rating on the set, but I’d expect you need about 2 amps (2A) when using a glass fuse typically. For blade fuses the smallest size you’ll usually find is 5A although 2.5A do exist.

      I checked the current rating (maximum draw) of the great LED set used for the installation guide and it’s 2 amps (2A), so that’s probably a good average number to go by for what to expect.

      LED light sets that come with a cigarette lighter plug often have a fuse built into them. If you don’t use that plug you’ll usually need to use your own fuseholder and some 18-22 gauge wire.

      Thanks for stopping by!

      • Thank you very much! So that little control box which comes with LED’s are with build in fuse, yes? So there is no need installing another one? :)

        • Hi Ted, the control box actually contains the electronics to drive the LEDs. Most often the cigarette lighter plug has a fuse built into it (you can often unscrew the tip to find it).

          Therefore if you don’t use it but hardwire the set you’ll need to add a fuseholder. You can optionally buy a cigarette lighter socket with bare wire on one end and just to it that way, too, saving having to worry about the included plug or adding a fuse.

          Here’s a great example of one like I’ve used before.

  3. Hi Marty!!! Great guide. Just installed the led lights and i have a little problem. When i push the ignition button the led lights working good and i can change the color but when the engine starts the led lights turning to white color and i cant change the color or to swith them off. Any ideas why this happening???

    • Hi Theodore! Thanks and I’m glad you like the guide. I worked very hard on it.

      It sounds to like most likely the power got interrupted when the car started. The fact that the LED set reset is the giveaway of that happening, unfortunately.

      So you’ll want to try to find a better power connection. You can try different places including the fuse box and use a fuse tap to get power there. Before going through all the trouble, I would run some jumper wires temporarily to test whatever connection I think should work.

      Then if it’s fine when the car starts wire it up neatly/properly. I hope this helps! :)

      • hi marty great post love it thank you !!!!!!!!!!
        i got some question i hope you can help me out please and thank you in advance……
        i installed 2 pairs of cob lights to my car (rx8) 1 as a fog lights the other one on the side of the car (fender) and 1 pair of led strips as a side markers ….. everything was wprking fine for about a month or so but yesterday everything when off so i have no fog lights no femder lights and not turn signal lights or marker lights so this morning i checked fuses and yes its blow so i try by adding a new one but same thing happened it blow too so do i have to add something else to all this lights ?? like a resistor or something like it ???? also i did not get the power from any of the sources you recomend ….i simply wire it to the turn signal wire …….thx

        • Hi there, and thanks for the comment! I’m very happy you like it.

          Here are my thoughts from what you described:

          1. Yeah definitely unless there’s a reason to do so, it’s generally best not to run power from a source like the turn signal wire.

          2. By the sound of things you have a short circuit that is blowing the fuse right away. That tells me that likely either a) one of the lights has a problem or b) there’s a short in the wiring somewhere.

          What I would do is disconnect/remove everything and try testing them off of the car using a 12V power supply or fused wire inline to temporarily power from the batter (like right off of the battery posts). That way you can find out if one of the lights is bad (It can happen!).

          [You might be able to just disconnect the wiring to the lights you installed and then run test wire to each one separately, one at a time, as needed to test them. That’s in case it’s a lot of trouble to remove the lights]

          If they all are working then you know you’ve most likely got an problem with the wiring you connected when installing them. But I would first make sure it’s not a defective light and go from there. It’s important to isolate where the problem is rather than guess about it. :)

          Thanks for dropping by!

        • I know this is an old post but I hope You can help.
          How do I reuse the cigarette lighter barrel to switch on and off? I’m going to hardwire so I don’t want to plug it in. Cheers and thanks for the excellent guide, just what I was looking for!

          • Hi Adam. If I understand your question correctly, you’re wanting to know how to hardwire a light set to the cigarette lighter socket, right? There should be a pair of wires running to it. You need to get access to those then you can tap off of the positive (and negative if needed) wire for power.

            If the cigarette lighter socket switches on and off with the ignition, that will work. Otherwise, you’ll need to find another switched wire. It’s often easier to tap off of the fusebox as you can find a switched circuit there or use the radio/accessory fuse circuit.

    • Hi Marty,
      I have just bought one of these sets, before installing I have attempted to test it, mine came with the cigarette lighter wire but also wire to directly wire in, I put these to the battery to test the lights and they are not working, the instructions are useless foe this issue, do you think it will be the remote or shud the lights cone on instantly when connected directly to the battery positive and negative?
      Thank you

      • Hi Brian. Typically the lights won’t come on once power is applied or will just blink then turn back off as mine do.

        I suspect the remote is likely the problem. Hopefully you’re able to resolve it.

        Often there’s a fuse built into them too, so you could try checking that as well (there maybe a removable tip or other portion holding the fuse inside).

  4. Hey Marty,
    Great write up!
    I am adding a set of these to my vehicle as well but I would like them wired to an always on circuit so I can leave them on at car shows. The problem is that the control box will continue to pull a charge off the battery overnight, etc when not driving the car for days. I am tapping directly into the fuse box to an always on circuit. Is there any way to add a switch to manually control the circuit when I want them on/off? Thanks!

    • Hi Aaron, and thanks for the comment!

      Yes, it basically as simple as you mentioned: You can just add an inline on/off toggle switch to the power lead you’re using for the LED light set. The LED set doesn’t use much current (around 2 amps most likely) so a small one should work fine.

      I checked and OReilly auto parts has some for around $3.50. Walmart, Fry’s, and many others carry them too. I wouldn’t pay over $5 for a switch like that in my opinion.

  5. Hi Marty! Terrific info. Thanks for posting it.
    I am wiring in a pair of 6 inch long plain, old white led strips that turn on when the car is running. Is it as simple as….add a new fuse (2.5 or 5 amp) to a vacant ACC spot in the box, wire the positive directly into that new fuse, wire the negative to a ground, and mount the led strips? And, you mention using 18-22 gauge wire. Is that it, or am I missing anything?

    • Hi Chris! I’m glad you liked my post.

      Yes, if they’re typical 12V power LED strips that’s right: You just need an ACC switched power source from the fuse box, radio harness, over where ever you find a good connection point.

      I mentioned the smaller wire gauge (like 22 ga., for example) in case people aren’t sure what size to get. If you have 18 ga or whatever already handy that’s cool. But just don’t spend the extra money on larger wire like 18 ga as it’s unnecessary.

      Since LED typically don’t draw much current the larger wire isn’t usually necessary.

      I hope this clears it up!

      Thanks. :)

  6. Hi! I’ve tapped the fuse box, but the LED’s are always on, even with ignition off! How can I set them to ignition on only?

    I have a Mini Cooper from 2011! Thanks for the help!

    • Hi there – It sounds like you’ve tapped off of the wrong fuse in the fuse box. How did you check to see if it switches off with the ignition? I normally recommend using a voltmeter to do it so you can be 100% sure.

      I would check that first and go from there. Thanks :)

    • Hi Marty.
      Just want to ask about one colour led stripe. I would like to connect it to the bulb socket in the back of my small VAN vw caddy. Its using 10W bulb. Do I need any transformator, or the led stripe can be connected straight away to the bulb socket? Reason why I want to do it is, have more light in the back and it will be controlled by doors (as regular light). There is 12V power, I alredy check it. Some led stripe have 4-10W per 1m. Soo… If I instal 2m it should come to 20W. Its a problem, or?

      Thank you for reply.


      • Hi there Maty. Usually it should be fine to use it even it’s 20W and and the original was 10W. As long as the power draw (total amps) doesn’t exceed the fuse for that power circuit (the lights in the rear).

        If it’s a standard 12V supply LED strip then yes you won’t need any kind of adapter. Just wire it directly if you like.


  7. Wow, fantastic tutorial! I have a set of LED strip lights, set up for use indoors. So, it comes with a A/C power adapter. I’m thinking if I cut the cord before it gets to the adapter, then wire that into my 12v ACC, I’m good to go, right, because the light strip itself and the controller are actually D/C?

    • Good evening, Bob! Thanks for the compliment I’m glad you like it.

      Yes, as long as it’s 12V DC on the output of the AC-DC adapter, that should be fine. Before cutting it you’ll want to be sure to note which is the positive wire and which is the negative one.

      Generally these days the wiring output polarity is often printed on the AC adapter. Yes, LEDs in the light strip are DC powered and the controller almost always is, too.

  8. I used the Fuse circuit tap rather than the cigarette lighter. However, when I turn the car on the lights come by default. Basically, the on/off button on the keypad is always in the “on” position when the car is started. I wish it was in “off” position when I started the car.

    Its quite an annoyance because I drive in the day mostly and have to turn them off every time I go somewhere. Is there a simply way so the lights are “off” by default?


    • Hi there. Unfortunately if the LED lights turn themselves on by default when they have power, about the only way to work around that is to wire them to a wire/circuit that has power when only when needed.

      That would most likely be from the parking lights or dash lighting, for example. Depending on what your vehicle is, you may be able to find a wire to tap off of so it’ll take care of this. Ideally there’s one or more wires for this (you’ll need to look up the schematics for your car or truck) inside so you won’t have to run a long wire.

      Hope this helps!

  9. I have a 2016 F150 that I installed a LED light bar underneath the tailgate. Wired it in directly to the tail lights and back up light. The problem is when I started up in the morning the rear blinkers blink very fast and no brake lights. For some reason after a while everything starts working After I turn it off and let it sit it seems to work. But it happens every morning. Can you help. Thank you

    • Hi Bryant. My first guess is that the body control module (or some other similar electronic controller) is seeing the extra load and it’s causing this problem. That or there’s a problem with how it’s wired up.

      I would be sure to ground the LED light bar to the body and try re-wiring the power to the LED lights. If you’re wanting it to come on with the parking lights/tail lights, you could wire a relay to +12V for power and have it switched (relay coil wire) on or off from the tail lights.

      Hopefully that helps.

  10. This is a great article. I have a big SUV that had an old DVD player installed in the roof. It’s long since died and wanted to wire some additional LED lights into the empty hole, but also wanted to perhaps wire around the foot area.

    I was wondering if you had the chance to wire 2 lights together using the same remote? I’ve searched but not found anybody that may have tried this or gotten this to work.

    • Hi Bruce. Unfortunately I don’t have a great solution at the moment. My best suggestion would be to use 2 of the same LED light sets that use an infrared remote (which most of those do).

      If both light controllers can be placed next to each other the remote should be able to control both at the same time.

      If you cut the cables that go from the controller to the LED strips and extend them with multi-conductor wire that might work too. Not the easiest thing to do, but another option.

      I hope that helps a bit!

  11. Absolutely fantastic diagrams as well as detailed instructions…!!!!!! FINALLY SOME I CAN COMPREHEND…!!!!!
    However , I do have a question for you and I truly truly hope you can email me a response fairly quickly.
    Ok , I have 2 separate amps for front and rear speakers and neither of them have pass-through outputs for “daisy-chaining” and they’re both 4-channel as well. My problem is , my H.U. only has front L & R , REAR L& R.
    If I’m correct in my understanding , thats a total of 4 channels. I’ve got 8 channels I need to get signal to , right ?



    • Hi David & thanks dropping by. :)

      As I have your email address you used for your comment, I’ll email you directly with the information you need here shortly. As the conversation sometimes go on a bit that’s easier than doing it here.

  12. Hi Marty, thanks for this thorough guide! Similar to Bob Labbs above, I’m chopping off an AC wall plug and hooking it up to my 12v van battery via the switch panel. Before cutting off the AC plug, I tested the strip and remote on AC power and it worked fine. Now that I’ve wired the positive end to my switch panel and grounded the negative end to the metal frame, the LEDs only light up blue and I cannot change it at all with the remote. Any idea how to fix this? Thanks in advance!

    LED light strip:

    Switch panel:

    • Hi Ben. My best “guesstimate” with the information you gave me is that it’s possible you don’t have a good ground. If you don’t, it’s possible to have a voltage drop and that can cause electronics to work oddly or not at all. (And similarly for a lower than anticipated positive voltage when that happens)

      My advice would be to double check both the ground & positive sides with a test meter to be sure they’re about 12V and that the ground is close to zero ohms to the battery negative side. Double check the light set’s wiring polarity too just to be sure.

      You can also temporarily bypass your connection to the switch panel by jumpering to a known good 12V source ground (including directly to the battery) to help eliminate the problem & help troubleshoot it. Scrap speaker wire is really useful for that.

      Whenever an issue like this comes up, I always verify what’s going on with a test meter so I know what’s really happening. You can get a decent meter with digital readout for under $10 or even $5 these days.

      Hopefully this helps a bit! :)

  13. Marty,

    can I use 3 LED kits on the same cigarette socket? Meaning can I solder each LED kit separately on the same wire of the one connecting to the cigarette socket?

    • Hi there, yes you should be fine doing that if the LED kits only draw up to a few amps each. The cigarette lighter socket fused circuit is usually rated for around 15 amps I believe.

      (A cigarette lighter uses a lot of current when it heats up the coil)

      Just check the kit’s amperage or fuse to find out how much it draws to be sure.

  14. I would like to extend the wire from the fuse box to the led controller. Will a 2-core 14amp 0.75mm^2 cable do the trick?

    • Hello Roxanne. That’s about a standard 18 gauge wire, which is more than enough for what you need. So it’ll be fine since the LED strips will only use around 2 amps or so.

      18AWG wire is very common for car audio & power projects like this. Thanks for dropping by. :)

  15. Hey Marty,
    First off, I want to say Thank You, for taking the time and shareing your knowledge in how to do this. I also am impressed that you included. recommendation of the add-a-circuit. I’ve followed your instructions and install my under dash LEDs. I may even end up install some in the rear seat area. Major kudos to you.

    Question: Do you have install instruction’s for underbody light kit’s?

    • Hi Sam and thanks for the comment. :) No I’m sorry I don’t currently have instructions for underbody lights. However, they wouldn’t be too hard, just that mainly you’d want to wire them to switch on/off with a switch or your parking light circuit and get a power supply from a +12V battery connection or other higher-current wiring source. That’s not really so hard to do in most cases.

      You can use a relay to switch the underbody lights on/off if they’re a simple on/off type.

    • Hi there. Basically, you’ll want to look up the positive headlight or parking light circuit wiring colors for your vehicle and you (usually) should be able to just connect the light set to those. In some cases, you may need to use a similar wire that’s switched on with the lights but not going directly to the headlights or parking lights.

      It depends on the vehicle etc. You’d connect the LED light set’s ground (-) wire to the vehicle body or other ground connection.


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