1995 GMC Sierra 4' Pigtail Wiring Harness for Pollak 1995 GMC Sierra - 4' Pigtail Wiring Harness for Pollak Replacement 7-Pole RV Socket. This mating connector and wiring harness serve as a bridge between your GMC Sierra wiring and a Pollak 7-pole trailer connector (PK11893). Connector mates with RV-style socket to form a weathertight seal. Features:4.7/5(95)Category: Accessories And Parts GMC K1500 Wiring Harness | Auto Parts Warehouse wwwpartswarehouse›GMC›K1500When it comes to selecting a reliable source for your electrical system's wiring harness, trust 4-Seasons. 4-Seasons's line of OE equivalent replacement wiring harness is specially developed to work like the original item that came installed in your vehicle as it was freshly released from the production line, therefore giving it with perfect fitment and good overall functionality.