How to Wire a Replacement 7-Way for a Gooseneck Trailer

Updated 01/26/2015 | Published 01/25/2015

Question:

Ok , please help have a Ford F-350 super duty Flat bed Dooley Pull a gooseneck, I accidentally tied a rope to the cord to keep it from rubbing on The bed And while making a sharp turn with the plug out from behind the truck So we got a new seven blade round trailer plug Everyplace I checked cannot find the right Connection Green,Yellow,Brown,Black,White,Red On the Gooseneck how wire a 7 blade Nothing is hooked in the center

asked by: Patrick

Expert Reply:

7-Way connectors like the # A7WCB that you referenced should be wired by function and not color. Since trailer manufacturers can sometimes use non-standard color wires for the taillight functions of their trailer it is best just to determine the function of each wire from your trailer's wiring and then wire it by function to the 7-way you end up getting.

What you can do to determine the function of each wire is use a 12 volt battery like a car battery and run a jumper wire from the positive post of the wire to the wires of the trailer and then wire it by function according to the diagram I attached.

expert reply by: Jameson C