This 4-way flat connector is designed to supply power for tail lights, turn signals and brake lights, as well as a ground connection. It features durable rubber-molded construction and is made with 72" of standard color-coded, bonded loop wire to easily splice into your vehicle's wiring system. It includes both a vehicle end and trailer end and can be cut to splice into existing wiring or left as a loop to serve as a useful extension harness. It is compatible with all 2-wire vehicle systems.

A connector tester works by plugging into the connector socket on your vehicle and responding to the various electrical signals produced by pushing the brake pedal, signaling a turn, turning on the running lights and so on. When the socket is getting proper power, the tester's various LEDs will light up corresponding to each wire in the connector. Testing your vehicle-side socket is essential after installing a new custom vehicle-to-trailer wiring harness and is highly recommended every time you hitch up to tow. Also, if you are experiencing electrical problems with your trailer, This tester will be able to tell you whether the problem is rooted in your vehicle's electrical system or if your trailer needs some rewiring.

Long Attachment Bracket for Vehicle Plug Brackets. Attaches to cross tube of hitch.

This trailer wire connector bracket is designed to hold a dual output 7-way RV blade and 4-way flat socket. It can be used with all OEM style 7/4-way combination sockets. It features sturdy steel construction and comes with mounting hardware.