Tail Light Wire Colors on Trailer Do Not Match Wire Colors on New Tail Lights

Updated 09/10/2018 | Published 09/07/2018

Products Featured in This Question

Optronics LED Combination Trailer Tail Lights - Submersible - 40 Diodes - Driver and Passenger Side

(3384)

$56.41

Hook Probe Circuit Tester

(66)

$14.40

Question:

bought a set of these, went to install and wire color on trailer does not match lights trailer had red/brown D.S trailer has brown/green P.S lights are brown green brown yellow What wire goes where???

asked by: Gino

Expert Reply:

The easiest way to determine the functions of the trailer wires is to plug in the trailer to a tow vehicle and have someone operate the vehicle lights while you test the wires with a circuit tester such as # PTW2993. Once you have identified the wire functions you can connect them to the lights in kit # TLL160RK. There isn't exactly a standard for trailer wiring so the definitive way of finding out wire function is to test like this.

On the lights a brown input indicates a running/taillight circuit. Yellow is left turn signal and brake lights. Green is right turn signal and brake lights. The white wire is the ground.

expert reply by: Michael H