FORD 4 PIN TRAILER WIRING

Trailer Hitch Wiring Harness - 4 Pin - Ford Accessories
This 4-pin wiring harness assembly is made to plug into the factory electrical system. The 4-pin design does not allow the use of trailers with electric brakes.
Tips for Installing 4-Pin Trailer Wiring | AxleAddict
Jan 18, 2019Installing 4-pin wiring on a trailer is an easy project that takes a few hours or less. I had no choice but to install the wiring while my boat was on the trailer, and having to work underneath my boat made the job a little more difficult, but if your trailer is empty, installation is much easier.Author: Matt G.