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Wire Color Functions of Trailer Taillight that Use Red, White and Black Wires

Question:

The lights have a white wire, a red wire and a black wire, I assume the white wire grounds to the trailer frame, but I dont know which wires are brake /turn and which is running lights?

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Expert Reply:

Under normal circumstances the white wire of the light is the ground circuit, the red wire is for the running light circuit and then the black wire is for the stop/turn circuit for each side of the trailer.

On the left side the black wire gets ran to the yellow wire and then on the right to the green.

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expert reply by:
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Jameson C

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