10 Pin Wire Harness | etrailer Convert your vehicle's 4-way flat trailer connector to a 7-way RV-style connector. Plug the 4-pole connector into your vehicle and connect the wire leads to get 12V power, electric brake or auxiliary White wire: ground wire A10-7084VP Mighty Cord 4-Way to 7-Way Pre-Wire Adapter Harness - 12". Wiring 10 pin wiring harness | eBay www›Search›10 pin wiring harnessFind great deals on eBay for 10 pin wiring harness. Shop with confidence. Skip to main content. eBay Logo: Shop by category. Shop by category. Enter your search keyword Yamaha 10 Pin Wiring Harness 26 ft long . Pre-Owned. $69. Guaranteed by Tue, Feb. 5. or Best Offer +$25 shipping.