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Troubleshooting Trailer Wiring Issues on Gooseneck with Functions Not Matching Truck

Question:

I have a gooseneck trailer that has 6 wires coming out of it. There is a black, red, blue, brown, yellow, and green wire. I have tried everything. On every other trailers it works fine so I assume that my pickup 2003 V10 f250 is not the problem. Just wondering if some one before me switched some wiring on the trailer end. Please help! Trailer brakes lock up when lights are on.

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Expert Reply:

It definitely sounds like someone has done some alternate wiring. I've attached an article on trailer wiring to help, but you will have to go off of the functions listed instead of the colors as the colors may have been changed around. It sounds like your running lights are connected to your trailer brake wire on the trailer. I recommend using a circuit tester with an incandescent light like # PTW2993, to work through each function of your connection with your trailer. I've attached a picture of the locations for a standard 7 way trailer side plug.

I personally would use the Epicord 7-Way Molded Trailer Plug with Junction Box # e99011, to ensure I had a clean connection to my truck. If you need a 6 way connection to your 2003 Ford F-250, I'd use the 6-Way Molded Trailer Wire Connector, 8', # H20036, and a junction box like # 38656. I'd clean up my wiring to assist in this process and allow for future troubleshooting issues. I suggest using ring terminals like # DW05702-1 and some dielectric grease like # LT37534.

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