With the many methods of towing in the RV world, you must have an electrical connection between the RV and the towed vehicle for lights turn signals brakes etc.. Pre-made cables are available at most Camper part stores, as well as kits for wiring into the wiring harness of vehicles.
PIN-4=Right Turn & Stop Lights (Green wire).
PIN-S= Electric Brakes (usually Blue). This pin is used to provide a variable voltage to the electrical brakes of larger tow trailers and campers to assist in stopping them.
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