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!Switch Panels · Boat Wiring · Easy to Install · Boat Lights · Complete Boat System Amazon: boat wiring harness Amazon: boat wiring harness. Skip to main content. Nilight 16AWG DT Connector Wiring Harness Kit LED Light Bar 12V On Off Switch Power Relay Blade Fuse for Off Road Lights LED Work Light-2 Leads,2 Years Warranty. 4.3 out of 5 stars 109. $16 $ 16. 19. Get it as soon as Tue, Apr 9.