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Why Do Some Trailers Have Different Color Wires?

Question:

Why are some trailer have blue and some have yellow. My trailer has green red brown yellow white black.

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Expert Reply:

Trailer wire color varies depending on the trailer. ALWAYS go by function and not by color. Regardless of what kind of connection # PK12703 you're using. I would look at your trailer's manual or you can just test the function. I've included a diagram to help you with the testing and setup of your trailer.

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