BOAT TRAILER WIRING HARNESS CONNECTOR

Boat Trailer Wiring Harness | etrailer
The 5 way flat trailer connector is most commonly found on boat trailers that have hydraulic brakes. The fifth wire is hooked up to the reverse light circuit on the vehicle which then sends a signales. 5-Flat electrical wiring connector Fifth wire added for surge brake lockout circuit which is becoming more common on today's newer boat trailers. 5-Flat wiring Connector will still work
Amazon: Boat Trailer Wiring Harness
CZC AUTO 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