What is the Function of the White Wire on a Trailer Wiring Harness for a Chevy Blazer

Published 08/05/2015

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Question:

I found the wires that route to the back of my rig and there is a green,light green, yellow and brown. My new light plug in wire has yellow, green, brown and white. I know you match the colors up to themselves but Im confused on what color the white wire connects to.

asked by: Harry

Expert Reply:

The white wire is going to be the ground wire. It will attach to a clean and corrosion free bare metal surface. You will want to test the wires on your Chevy Blazer with a circuit tester such as # PTW2993. This is because there is no standard for wire color so there is no guarantee that the same color wires on the vehicle will match the functions on the wiring harness.

Normally on a trailer wiring harness the brown wire is running lights, yellow is left turn signal and brake lights, and green is right turn signal and brake lights.

expert reply by: Michael H