8 wire harness trailer | eBay Find great deals on eBay for 8 wire harness trailer. Shop with confidence. 8 Wire Trailer Harness Diagram | Trailer Wiring Diagram Jan 17, 20198 Wire Trailer Harness Diagram – 8 wire trailer harness diagram, People understand that trailer is a vehicle comprised of very complicated mechanisms. This car is designed not just to travel one place to another but also to carry heavy loads. This article will be discussing 8 Wire Trailer Harness Diagramh are the benefits of knowing such knowledge?