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Wiring Trailer Taillights, What Wire Connects to What?  

Question:

When connecting tail light for a 7 pin plug, what is the black wire connected to on the trailer?

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Expert Reply:

On the LED Trailer Tail Light w/ Reflector # STL13RFHXB the black wire is for the tail/running lights. The red wire is the brake and turn signal lights and the white is the ground.

I have attached below a help article that covers the wiring on trailers as well in case you have any other questions beyond that.

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Bud M

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