Can a 4 prong trailer light plug system be converted to a 7 prong?
phikt06 asked: I have a 2003 Ford Explorer Sport Trac factory wired with a 4 prong wiring system. I purched a trailer with electric brakes which uses a 7 prong system. Is there a way to convert the 4 prong to a 7 prong system?Electric Trailer Brake Control