Wiring Diagram for the Pollak Heavy-Duty, 7-Pole, Round Yes, the 7-Pin Round connector is wired differently than the 7-Way flat RV connector. I will list the typical heavy duty truck wiring connections inside the plug on the trailer side for you. At the index guide for plugging the trailer end in to the vehicle end the pin directly below will be the ground connection. Amazon: POLLAK 7-Way Round Pin Trailer End & Vehicle POLLAK 7-Way Round Pin Trailer End & Vehicle End Socket Kit BougeRV 7 Way Trailer Plug Weatherproof Trailer Wiring Harness 7 Pin Trailer Connector with Junction Box for RV Trailers, Campers, Caravans, Food Trucks (8 Feet Long) by BougeRV $27 $ 27. 89. In Stock.
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