my brand new trailer has a 5 pin plug. Truck is 4 pin. Trailer guy said 5th is for brakes but I dont have brakes so it doesnt go anywhere. They always wire them that way now. He said just plug the 5 pin into the four pin, the dead one will be on the end, not connected.
That being said, I think the fifth wire in your case is the second brown wire. They get tied together to connect to the same pin on the plug.
Last edited by SkunkBoat; 10-11-2014 at 10:12 AM.
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