When this happened to me I bought a plug at Radio Shack. You need to make sure you have the polarity correct when you wire it. Also, there is usually a fuse inside the plug. Is it there and is it ok?
Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2012 Honda CRV on Blue Ox Aventa LX tow bar. Full timers since Jan 2012.