7 Pole Round Pin Trailer Wiring Connector Diagram. The three additional pins are: trailer brakes, back-up lights and eTrailer: Trailer Wiring Diagrams. Crimp each connector then plug the connector into the tow vehicle.
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. Trailer-Vehicle Connector Wiring. by James W. This IS the standard trailer plug wiring setup.
Trailer wiring is very important to towing safety.
Seven-pin connectors are rarely used on trailers for local use.
Wanting to switch to the RV style as that is the new "standard". Wire, Self Locking w/Coded Sockets, Supplied with Spring Wire Guard Info. Tighten it in place with the larger set.