Wiring Multiple Lights On a Trailer with Red and Black Wires  

Question:

Expert Reply:

In most cases, a trailer tail light with only two wires will ground through the mounting hardware so there is no ground wire. Therefore, the wires are for stop/turn and running lights. That said, not every light is the same and all should come with some sort of wiring diagram you can use to install them correctly. However,, if I were to guess I would say red is for stop/turn and black is for running lights. I have attached for you below our entire selection of tail and marker lights.

If you have multiple lights on each side of the trailer, you would simply combine all the wires with the same function and attach to them to the wire going to the trailer connector. Please note, not ever trailer and light manufacturer uses the same color wires which is why you need to match by function instead of color.

expert reply by: Conner L

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