How to Convert a Wishbone 5-Way to a Wishbone 4-Way Trailer Connector

Updated 12/03/2018 | Published 12/01/2018

Question:

I have trailer with brown/green and yellow/brown and white.....I am trying to wire to 4 wire pigtail with no success

asked by: Brain

Expert Reply:

It looks like you have a 5-way wishbone wiring harness. I cannot say for certain but my guess would be the that the following are true:

White Wire = Ground
Green/Brown = Right Running Light
Yellow/Brown = Left Running Light
Yellow = Left Turn/Stop Light
Green = Right Turn/Stop Light
Red = Reverse Light/Brake Output

In order to test this you will need to apply 12 volt power to each wire and see which circuit it activates. For a 4-way wiring harness to replace this you are going to want to use the Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector part # 002402. If the above is correct then you will need to make the following connections with the new trailer connector.

White Wire = White Wire
Green/Brown = Brown
Yellow/Brown = Brown
Yellow = Yellow
Green = Green
Red = Null