8 Pin Connector | etrailer This 7- and 4-pole trailer connector eliminates the need for an adapter and allows you to tow a trailer with either a 7- or 4-pole plug. Socket connects to your vehicle's OEM wiring system mounting holes (center to center): 2-3/8" 1-Year limited warranty Note: Only one connector - a 4-way or a 7-way - can be used at a time because the covers on this socket will not open far enough 8 pin wiring harness | eBay Find great deals on eBay for 8 pin wiring harness. Shop with confidence. Skip to main content. eBay Logo: Tell us about your vehicle to find the right parts faster. SPONSORED. Khrome Werks 8 Pin Trailer Wiring Harness Kit 15-16 Harley Davidson Freewheeler. Brand New. $109. Buy It Now.