Boat Wiring Harness | Boat Wiring - Easy to Install Rewire Your Boat - Quickly and Correctly. Take days off your boat wiring project. Our snap-together boat wiring harness comes in three sizes for boats up to 30' and is designed to handle almost any boat wiring configuration - and there is no freight charge for purchases in the lower 48 states. Simply snaps to panels and parts - ours or yours! Boat Wiring Harness | eBay This harness features a 9 pin round plug on one end and an 8 pin plug on the other (7 female) with an extra wire on this end. We're your port for thousands of hard to find boat parts, original manufac..