CURT LED-Compatible 7-Way RV Blade Vehicle-Side Trailer Wiring Adapter Model 57003CURT LED Compatible 7 Way RV Blade Vehicle Side Trailer Wiring Adapter Model 57003 There are several different types of connectors used to supply power from a tow vehicle's electrical system to a trailer's wiring system. Some trailers only need the bare essentials running lights, brake lights and turn signals while others require a connection for reverse lights, electric brakes and auxiliary power. With connectors ranging from simple to complex, it