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How To Determine Wire Function On Harness At Rear Of Vehicle


Y is ther a light green and a dark green wire coming off the truck harness at the trailer feed.


Expert Reply:

The color of wires on a trailer wiring harness can be different colors so we always recommend using a circuit tester like part # PTW2993 to test the wires on a harness by function instead of color.

A typical 4-wire harness will use White for ground, Brown for running lights, Yellow for left turn/brake, and green for right turn/brake.

The best way to determine what the functions are is to have someone sit in the driver seat and run through the functions while using the circuit tester.

expert reply by:
Jeffrey L

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