How To Attach New Trailer Connector On Boat Trailer With Wishbone Wiring

Question:

My trailer wires were cut. Theres a green, green/brown, yellow, yellow/brown, and white wires. The new plug has blue, green, yellow, brown, and white. What color combos go together. Ive tried everything that makes sense.

asked by: Lisa D

Expert Reply:

It sounds like your trailer has a wishbone harness. A wishbone harness splits the running light circuit at the connector so no jumper is needed to be run from one side of the trailer to the other side.

On a wishbone 4-Way connector the white wire is ground, yellow is left turn signal, yellow/brown is left side running lights, green is right turn signal, and green/brown is right side running lights.

You can use a circuit tester like part # PTW2993 and test the pins on the vehicle side trailer connector.

On the new trailer connector splice white to white, yellow to yellow, green to green, and connect the yellow/brown and green/brown to the brown wire. The blue wire can just be taped off. It would be used for brakes but it sounds like your trailer does not have brakes so it will not be needed.

expert reply by: Jeffrey L