Vehicle Trailer Wiring Harnesses, T Connectors Unplug your vehicle's factory wiring harness and plug in a Hopkins vehicle wiring harness. That's how easy trailer wiring is with a Plug-In-Simple! wiring kit, featuring Exact OEM Fit Trailer Harness Wiring - Walmart www.walmart››Automotive ElectricalTowing Wiring Harnesses and Kits. Boating Supplies. Trailer Harness Wiring. Showing 40 of 3718 results that match your query. Search Product Result. Marketplace items (products not sold by Walmart), and items with freight charges are not eligible for ShippingPass.