5-Flat Trailer End Connector, 4' Wishbone Harness, 4' Ground, 4' Auxiliary | West Marine
T H Marine Trailer Wire Adapter | Sportsman's Warehouse
Amazon.com: Trailer Wiring Harness Kit 4-Way Wishbone Style, Y Style 18AWG Pure Copper Core Color Coded Wire with Standard 4-pin Flat Plug Connector, 4' Female and 25' Male for 12V Trailer Boat