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Trailer 4-Way Wiring Harness has 2 Wires Coming Out of Running Light Pin

Question:

From car is white and a yellow green and brown But the trailer has a white yellowbrown and greenbrown that can be spit ? How do I wire

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Expert Reply:

It sounds like you have a wishbone harness. A wishbone harness has 2 wires for the running light circuit, one for each side of the trailer. That way you do not have to run a jumper wire from one side of the trailer to the other for running lights on both sides. These two running light wires will be spliced together to connect to the single running light wire on a 4-Way.

Yellow/brown would be for the left side and green/brown the right side. On a 4-Way, trailer side, the covered pin is ground. Next to it is the running light pin. Then the left turn/brake light pin, and the last pin is right turn/brake light. I have included a link to our trailer wiring FAQ which includes some diagrams.

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