This electrical wiring adapter is designed to adapt a 4-way flat vehicle connector to fit a 5-way flat trailer plug. It is specifically intended for boat trailers with surge brakes, adding in a fifth wire for the reverse lights and allowing your vehicle's 4-way flat to easily plug into your boat trailer 5-way flat. This boat trailer wiring adapter can be used to connect the taillights, brake lights, turn signals and reverse lights.
Q&A for Trailer Connector Adapter - 4-Way Flat to 5-Way Flat
Q: Will this connector works on my car?
A: This connector is almost universal, equiped with the standard 4 way flat and 5 way flat plug, it works fine on your car and trailer.
Q: What is the blue wire?
A: The blue wire is to unlock the trailer brakes when you go in reverse. Otherwise the surge brakes will lock up when you try to back up.
Q: How to hook up blue wire?
A: If you are using the blue wire for brakes then you need to attach it to the brake light wire in the rear light. Likewise, if you are using it for a reverse light then connect it to the reverse light.
Q: Can I splice the blue wire directly into the reverse light wiring in the rear tail light?
A: Yes, you can tap into the vehicle reverse lights to power the trailer reverse lights (blue wire).
Q: How can i find the reverse wire on my car?
A: The easiest place to find the wire is the wire loom that goes from the hatch to the body of the vehicle. It can typically be found near the top. Once you find this you will need to pull out the wires and test them using a circuit tester until you find the circuit that is only active when in reverse.