Trailer Wiring Adapters - Walmart Trailer Wiring Adapters. Showing 37 of 37 results that match your query. Search Product Result. OPT7® Y Splitter 4 Tow Pin Connector Adapter Harness Wiring for Truck Tailgate to Attach to Trailers, LED Tailgate Light Bars, Boats, Towing, Construction & Safety Lighting – Weatherproof Construction Trailer Wiring Adapter Connector-Hitch Amazon: trailer hitch wiring adapter Amazon: trailer hitch wiring adapter. Hitch Light Trailer Wiring Harness Extender. 4.7 out of 5 stars 428. $8 $ 8. 19. Get it as soon as Mon, Aug 5. FREE Shipping on orders over $25 shipped by Amazon. Hopkins 40955 Multi-Tow T-Connector Wiring Kit. 4.0 out of 5 stars 200. $23 $ 23. 95.