Standard 5 Pin Trailer Wiring. The good news is that the standard connector for trailers uses four pins. I drew this crude diagram to help explain.
Easy to install one piece plastic molded plug. Is there anything standard with respect to wiring or was this a dealer add-on that may not be wired standard. A number of standards prevail in North America, or parts of it, for trailer connectors, the electrical connectors between vehicles and the trailers they tow that provide a means of control for the trailers.
Repair or replace your trailer wiring or connectors with replacement parts at Camping World.
This can often happen when modding your stick.
In any case, it is a simple test to see if a ground detection system is what activates the trailer wiring. How much voltage should a trailer brake controller put out? Easy to install one piece plastic molded plug.