Universal electrical adapter that lets you connect a 7-way RV blade trailer plug to a vehicle with only a 4-way flat socket, with wiring included to splice in a trailer brake controller connection.
It's a common problem: your vehicle might only have a 4-way flat socket, but your trailer has a more capable 7-way RV blade plug that needs to connect for reverse lights, electric brakes, and auxiliary power. The Curt 57186 solves this mismatch, adapting a 4-way flat vehicle socket to accept a 7-way RV blade trailer connection.
Beyond the basic adapter function, this kit includes the wiring and electrical components needed to splice in and route a trailer brake controller connection from the cab of your vehicle — a feature not every simple adapter offers. The 7-way connection covers tail, brake, reverse, turn signal, and auxiliary power functions, giving your trailer everything it needs even though your vehicle's factory socket is more basic.
Bridges the mismatch between socket types
Includes components to splice in a controller connection
Keeps the connector clean and ready for use
Keeps wires contained and well protected
Installation is plug-and-play at the connector level, but some manual wiring is required to complete the brake controller splice. This is a universal adapter, not vehicle-specific, so it should fit most trucks and SUVs equipped with a standard 4-way flat socket.
In The Package: • 4-Way Flat to 7-Way Blade Adapter • Brake Controller Splice Wiring • Mounting Brackets • Spring-Loaded Dust Cover