How To Wire 4-Pole Harness with 5 Wires

Question:

trailer harnes has, white, green, yellow and a brown/ yellow wire and brown/ green wire are which are actually 2 wires each stuck together a green-brown and a yellow brown but 4 wires...do you only connect the brown sides to brown on the 4 way plug or all 5 wires to brown on 4 way plug

asked by: Mike E

Expert Reply:

I can't comment on specific wire colors but it sounds like you're referring to a wishbone trailer wiring harness like part # A25W2GWB which has five wires and four pins on the connector. There will be two running light wires (one for each side), a left stop/turn wire, right stop/turn wire, and ground wire. The running light wires are usually brown/yellow and brown/green whereas the left stop/turn is yellow, the right stop/turn is green, and the ground wire is white.

If your colors don't match the above you'll need to apply power to each wire at the connector and see which light it activates.

expert reply by: Conner L