Trailer Brake Lights Not Working

Question:

i hook up a four way to my 2002 GMC 2500 HD and hook up my trailer. all my lights work but i have no brake lights on the trailer. i also donot remember see a yellow and green wire under the truck. but i did use a test lights and hook up the lights that work when i test the wires.

asked by: Israel

Expert Reply:

I am assuming from your e-mail that you used a circuit tester on the plug on your 2002 GMC 2500 HD and all the pins are working. That would lead me to assume that there is a faulty wire somewhere on your trailer. Check the wiring on the underside of the trailer to ensure that all the wire is in tact and correctly run. If only the brake wire is damaged/missing, you can replace it using this wire, item # 10-1-1.
If you only need to replace the wiring on the system, you can use this kit, item # A35W42B.
If you find you need to replace the entire system, you can view our selection of lighting kits.

expert reply by: Andi