Basic 4 Way Trailer Wiring Diagram. Wiring your four-pin trailer can be a challenge when you first do it, but it's a simple do-it-yourself task. The first step in wiring your trailer cables is to ground the white cable first.
There are several standards for trailer wires, and if you search, you'll find a different Trailer Wiring Diagram for each.
The original wiring on my boat trailer was damaged and installed incorrectly by the previous owner.
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Small trailers must be equipped with lights. Find the trailer light wiring diagram below that corresponds to your existing configuration. Please, follow these basic instructions to place your order: Add only the numerical characters of the Item Number.