{"product_id":"mecmo-uscar-7-to-4-pin-trailer-harness-41in-t-adapter-4-pin-flat-outlet-16-awg-copper","title":"MECMO USCAR 7-to-4 Pin Trailer Harness 41in T-Adapter — 4-Pin Flat Outlet, 16 AWG Copper","description":"\u003cp\u003e\u003cstrong\u003eThe MECMO 55384 is a 41-inch USCAR 7-pin to 4-pin T-adapter that converts a factory 7-way trailer socket into an additional 4-way flat connection for tailgate light bars and secondary trailers.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact, plug-and-play harness gives you a quick way to add a 4-prong flat outlet without altering your vehicle’s factory wiring. Built to fit the standard USCAR 7-pin socket found on many modern trucks and equipped with 16 AWG pure copper conductors, the adapter maintains reliable lighting signals while protecting connections with a snug, water-resistant cap. It’s designed as an extension\/replacement for existing USCAR harnesses so you can use LED tailgate light bars, smaller trailers, or accessories that require a 4-way connector.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this adapter preserve my factory tow wiring?\u003c\/h3\u003e\n\u003cp\u003eThe MECMO T-connector plugs into the factory USCAR 7-way socket and routes wiring to an additional 4-pin flat outlet without cutting or splicing the original harness. It keeps the factory 7-way available for heavy trailers while adding a convenient 4-way for lights or smaller towed items.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNo permanent modifications: plug-in installation to existing USCAR socket.\u003c\/li\u003e\n  \u003cli\u003eLeaves the factory 7-pin accessible for full tow capabilities.\u003c\/li\u003e\n  \u003cli\u003eWorks as a replacement or extension for damaged harnesses.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this work with my truck or trailer brand?\u003c\/h3\u003e\n\u003cp\u003eThe adapter uses the standard USCAR 7-way connection, so it’s compatible with most OEM 7-pin sockets on popular trucks and trailers. It’s suitable for vehicles and trailers from Chevrolet, Ford, Dodge\/RAM, GMC, and many others that use the USCAR format.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with factory 7-way USCAR sockets on most trucks.\u003c\/li\u003e\n  \u003cli\u003eUseful for trailers, RVs, boats, ATVs and LED tailgate light bars.\u003c\/li\u003e\n  \u003cli\u003eUniversal fit — no brand-specific wiring required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and weather-resistant is the wiring?\u003c\/h3\u003e\n\u003cp\u003eConstructed with 16 AWG pure copper conductors and a tight-fitting rubber cap for the 4-pin outlet, this harness is built to handle vehicle use and outdoor exposure. The design shields contacts from moisture and debris, helping preserve consistent light signals.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e16 AWG pure copper for efficient electrical flow and longevity.\u003c\/li\u003e\n  \u003cli\u003eWater-resistant rubber cap protects the 4-way flat socket.\u003c\/li\u003e\n  \u003cli\u003eRugged construction suited to everyday towing conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I install the MECMO 55384 adapter?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward: plug the USCAR 7-pin end into your vehicle’s factory 7-way socket, then connect your 4-pin flat accessory or tailgate light bar. No cutting, splicing, or special tools are needed, making it suitable for quick DIY setup at home or on the road.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlug the USCAR 7-pin into the vehicle’s factory socket.\u003c\/li\u003e\n  \u003cli\u003eAttach the 4-way flat connector to your light bar or trailer.\u003c\/li\u003e\n  \u003cli\u003eUse the rubber cap when the 4-pin is not connected to keep it clean.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The MECMO 55384 adapter is aimed at truck owners, fleet operators, and recreational users who need to add a 4-way flat connector for LED tailgate light bars or smaller trailers without modifying factory wiring. It’s especially useful for drivers who want to keep their original 7-pin tow socket available while adding flexible, weather-protected connections for secondary lighting or accessories.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this with LED tailgate light bars?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the 4-way flat output is designed to power LED tailgate light bars without cutting your factory harness.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do I need to splice wires to install it?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — the MECMO 55384 is a plug-and-play T-connector that installs without splicing or special tools.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"MECMO","offers":[{"title":"Default Title","offer_id":48085440495774,"sku":"B0B5G8BPY2","price":40.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mecmo-55384-front-view-plugged.jpg?v=1785871050","url":"https:\/\/northtrailauto.ca\/products\/mecmo-uscar-7-to-4-pin-trailer-harness-41in-t-adapter-4-pin-flat-outlet-16-awg-copper","provider":"North Trail Auto","version":"1.0","type":"link"}