Shop Nilight 7 Way to 4 Way Coiled Trailer Extension Wiring Harness 5FT Heavy Duty 7 Pin Round to 4 Pin Flat Jacket Cable Add Reverse Lights Adapter Cord for Tow Hitch Car RV Boat Truck in high quality, support 2 Years Warranty. It easily plugs in your vehicle’s electrical socket and usually requires no additional wiring Works on most vehicle wiring components like turn signals.