Light Wiring Harness | etrailer Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness.T-connector plugs directly into existing wiringred converter reduces strain on wiring system 1-year warranty Installation This custom-fit T-connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. Amazon: light wire harness Nilight 10014W LED Light Bar Wiring Harness Kit 14AWG Heavy Duty 12V 5Pin Rocker Laser On Off Waterproof Switch Power Relay Blade Fuse-1 Lead,2 Years Warranty. 4.4 out of 5 stars 227. $19 $ 19. 55. Get it as soon as Tue, Mar 26. FREE Shipping on orders over $25 shipped by Amazon.