How to Build Your Own LED Tail Lights

Updated February 21, 2017

Vehicle customisation can enhance pride in ownership and improve resale value. Light-emitting diodes (LEDs) can give any car a slick and luxurious appearance. Install custom LED tail lights into a vehicle's existing housing for brighter illumination, longer bulb life and a stronger overall presence on the road and/or at auto shows. Customise the layout and functions of the bulbs for a look that turns heads, catches stares and is entirely one-of-a-kind. Some experience with automotive light wiring makes this customisation go faster; each year and model may have particularities, but the results are impressive.

Remove the housing of the tail light from the vehicle. Begin by unscrewing and/or carefully prying it out with a small, straight-head screwdriver. Remove the plastic from the rear of lamp. Leave remaining the mounting points with enough support to rehouse the lights after customisation.

Mold ABS plastic to create custom plates that match the existing housing of the vehicle. Contour the plastic to the shape of the tail light with a heat gun. Specific customisation options include working with depth to create visual interest or coloured plates as allowed by your jurisdiction's traffic laws.

Create the grid pattern for the LEDs on the plastic plates. Lay out the grid pattern on the formed plastic plates. Drill holes in the plates that follow the grid pattern. Lay out functions required of the lights for the particular vehicle. This may include brake lights or indicators. Holes that are 5mm usually allow the most variation in customisations, but any size will do as long as the drilled holes and bulb sizes match.

Attach the LED bulbs. Apply a small drop of instant glue to each LED bulb, and place each bulb in a drilled hole.

Secure resistors to the LEDs. Solder one end of a resistor to the positive side of the LED. The positive side is the side with the long leg.

Connect the wiring. Determine the wire colours in the car. Use a trailer-hitch wire harness to connect the grounds through a main lead, and connect the wires into the car.

Secure the tail lights in the car. Fit the ABS plastic plates with the LED lights securely into place. Screw in components as necessary for the particular make and model. Seal with black silicone as necessary.


Avoid cracking the plastic by placing the entire lamp in an oven at 150 to 200F for about 30 minutes. After the sealant heats, use a thin knife to open the lens. Customise the brightness of the lights by using different resistors. Many people like a 510 ohm resistor. For a brighter lamp, use a smaller value, such as 450 ohm. In some American models, wires follow a standard. For example, black is the common ground. Light green is used for reverse on both sides. Yellow is used for the drivers' side turn signal. Dark green is the passengers' side turn signal. Turquoise is used for brake lights on both sides. Brown is used for the tail lamp on both sides. Refer to the vehicle's manufacturer for specific information.


Wear goggles when soldering. Wear gloves when working with sharp objects, power tools or high temperatures.

Things You'll Need

  • Goggles
  • Gloves
  • Small, straight-head screwdriver
  • Acrylonitrile butadiene styrene (ABS) plastic
  • Heat gun
  • Drill
  • 5mm drill bit
  • 5mm LED lights
  • Instant glue
  • Resistors
  • Soldering iron
  • Trailer-hitch wire harness
  • Black silicone
  • Silicone gun
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About the Author

Rachel Moran started writing in 2003. Her journalism has appeared in "Orange," "Luxury," "Creative Loafing," "tbt*" and other publications. Her fiction has appeared in the "Tampa Review," "Florida Review," "BLOW" and "Pindeldyboz." Her copywriting has served clients from Bayer to Volkswagen. Moran received her Bachelor of Arts in writing from the University of Tampa.