What Are Wire Colors On 2004 Chevrolet Silverado For Trailer Wire Harness

Updated 03/19/2025 | Published 03/02/2017

Question:

On the truck side which color wires do what?

asked by: Jake

Expert Reply:

Manufacturers can change the wire colors at any time, so you want to test the wiring with a circuit tester like part # PTW2993 to make sure you find the right wires when installing wire harness.

We do have a chart that shows what color wires are typically found on a vehicle. For your Silverado Green is used for right turn and brakes, Yellow for left turn and brakes, Brown is for taillights, and Black is for ground.

I have attached a helpful article that explains vehicle and trailer wiring you can check out.

expert reply by: Jeffrey L