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Trailer Connector has 4 Pins But 5 Wires: What are the Functions of the Wires  

Question:

2011 dodge Laramie flat plug 4prong wiring What does each wire go to on the trailer. Trailer has 5wire 4 prong plug 2brn1 what 1 yel 1blue.

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Expert Reply:

Your wiring harness is what is called a wishbone harness. The white wire is the ground and is attached to the only covered pin out of the 4 on a trailer side 4-Way.

The 2 brown wires are running lights; one for each side of the trailer.

The yellow wire is left turn signal and brake lights.

The blue wire, which is normally green, is the right turn signal and brake light wire.

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Michael H

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