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Wiring A 5 Wire Wishbone Trailer To Vehicle's 4 Way Flat


Hello i have a boat trailer with green and brown Coming of one side and yellow and brown coming Of the other side. How do i hook them up to the 4 flat plug


Expert Reply:

It sounds like you have a typical wishbone wiring setup which usually matches the following: green for right turn/stop, yellow for left turn/stop, brown for taillight/side markers, and white for ground. You would want to wire the trailer to the vehicle in a color to color manner; and for the trailer's brown/green and brown/yellow wires, those get wired directly to the vehicle's brown wire.

To make things simple, you can use something like Wesbar Wishbone Wiring Harness with 4-Pole Flat Trailer Connector - Trailer End - 18" # 002402. This allows you to wire up all 5 of your trailer wires color for color and then simply plug it into the vehicle's 4 way connector.

Keep in mind, color is usually a good way to determine the function of each wire, but the only way to truly know is by using a tester such as LCD Digital Circuit Tester # PTW2992. I attached demonstration videos for you along with a wiring diagram.

4 Way Flat 5 Wire Diagram
4 Way Flat 5 Wire Diagram
(click to enlarge)
expert reply by:
Andrew N

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