ShopNilight Dual Output 4 Way Flat Vehicle Side to 7 Way RV Blade Wiring Adapter 4 Pin Flat to 7 Pin Round Blade and 4 Way Trailer Wiring Harness Adapter w/Mounting Bracket for Truck RV in high quality, It easily plugs in your vehicle’s electrical socket and usually requires no additional wiring Works on most vehicle wiring components like turn signals.