7 Pin Trailer Wiring Harness | etrailer Tow a trailer with either a 7-way or 4-way plug with this dual vehicle-end connectoruded pigtail harness hardwires into your vehicle and the connector end mates with the 7-pole socket to form Features: Dual connector lets you hook up to a trailer with either a 7-pole, RV-style plug or a 4-way flat plug Pigtail harness hardwires into your vehicle and connects to 7-way socket Includes Amazon: 7 pin trailer wiring harness wwwon›Search›7 pin trailer wiring harnessBougeRV 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. 4.5 out of 5 stars 64. $27 $ 27. 99. Get it as soon as Tomorrow, Mar 6. FREE Shipping by Amazon.