Wiring Connections For Wishbone Harness To Use On Trailer Wiring

Updated 11/01/2013 | Published 10/30/2013

Question:

yellow brown wire and green brown wire where do they connect to

asked by: Tom

Helpful Expert Reply:

It sounds like you have a wishbone harness. On a typical 4-way connector, you would have a yellow wire that would be for a left turn and left brake light signal, and a green wire for the right turn and right brake light signal. You would also have a single brown wire for the running lights and a white wire for the ground.

A wishbone connector will have a brown/green wire for the running lights on the right side, and a yellow/brown wire for the left side running lights. you will also have a yellow wire that is for the turn signal and brake lights on the left side, and a green wire for the right side turn signal and brake lights.

The best way to test this is to use a 12 volt battery and test each circuit to confirm their function. I have linked you to a couple of help articles that explain trailer wiring and also troubleshooting wiring installations. I have also attached a drawing that shows the wires and how they should be run on your trailer when you have a wishbone wiring.

expert reply by: Jeffrey L