{"product_id":"oyviny-uscar-7-pin-to-4-pin-trailer-wiring-harness-41in-pure-copper-plug-and-play-adapter-for-led-tailgate-light-bars","title":"Oyviny USCAR 7-pin to 4-pin Trailer Wiring Harness — 41in Pure Copper Plug-and-Play Adapter for LED Tailgate Light Bars","description":"\u003cp\u003e\u003cstrong\u003eOyviny's plug-and-play USCAR 7-pin to 4-pin trailer wiring harness converts a factory USCAR 7-way socket into a 4-way flat connector for easily adding LED tailgate light bars or standard 4-prong trailer wiring without cutting factory wires.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf your truck or SUV is equipped with a factory tow package and a USCAR 7-pin socket, this adapter gives you a simple, reversible way to add a 4-prong connector for light bars, tailgate lights, or basic trailer functions. The harness preserves the OEM 7-way connector while providing a separate 4-way flat outlet, uses 16 AWG pure copper conductors, and arrives pre-sheathed in a protective slit loom for longer service life. It’s built for quick installation and broad vehicle compatibility when a factory USCAR 7-pin is present.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this harness install and use with an LED tailgate light bar?\u003c\/h3\u003e\n\u003cp\u003eInstallation is plug-and-play: plug the USCAR 7-pin end into your truck’s factory tow socket, then mount or route the 4-way flat to your tailgate light bar or under-tailgate wiring. No wire splicing, soldering, or cutting of factory cabling is required, making the process fast and reversible.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect USCAR 7-pin plug mates with factory tow sockets.\u003c\/li\u003e\n  \u003cli\u003e4-way flat output connects to light bars or trailer 4-prong plugs.\u003c\/li\u003e\n  \u003cli\u003eNo permanent changes to vehicle wiring; easily removable.\u003c\/li\u003e\n  \u003cli\u003e41-inch harness length for flexible routing and mounting.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this affect vehicle safety systems like parking assist or blind spot detection?\u003c\/h3\u003e\n\u003cp\u003eSome vehicles detect a trailer when a 4-prong load is attached; that detection can temporarily disable parking assist, blind spot monitoring, or backup assistance. If your vehicle uses rear parking sensors or trailer-detection features, be aware these may be deactivated while the adapter is powering a light bar or trailer circuit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVehicle-specific: systems vary by make and model.\u003c\/li\u003e\n  \u003cli\u003eDetection occurs when the vehicle senses trailer wiring or loads.\u003c\/li\u003e\n  \u003cli\u003eRemoving the adapter or disconnecting the 4-way restores normal systems.\u003c\/li\u003e\n  \u003cli\u003eCheck your owner’s manual for factory tow package disclaimers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat electrical functions does the 4-way connector provide?\u003c\/h3\u003e\n\u003cp\u003eThe standard 4-pin flat wiring supplies brake lights, turn signals, tail\/running lights, and a shared ground circuit for common trailer and light bar setups. It covers the primary lighting needs for small trailers and LED tailgate light bars without introducing auxiliary circuits like reverse or auxiliary power.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLeft and right turn signals and brake lights supported.\u003c\/li\u003e\n  \u003cli\u003eRunning\/tail light circuit included for visibility lighting.\u003c\/li\u003e\n  \u003cli\u003eCommon ground connection for stable operation.\u003c\/li\u003e\n  \u003cli\u003eNot designed to carry dedicated 12V accessory power or trailer brakes.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and use cases are compatible with this adapter?\u003c\/h3\u003e\n\u003cp\u003eOyviny designed this USCAR 7-to-4 adapter for vehicles that come from the factory with a USCAR 7-pin towing socket. Common compatible trucks and SUVs include many GMC, Dodge Ram, Ford, Toyota Tacoma\/Tundra, and Jeep models, but compatibility always depends on the vehicle’s factory tow package and wiring layout.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks only on vehicles with a factory USCAR 7-pin tow socket.\u003c\/li\u003e\n  \u003cli\u003eGreat for adding under-tailgate LED light bars or simple trailer connections.\u003c\/li\u003e\n  \u003cli\u003eNot suitable if your vehicle lacks the factory tow connector.\u003c\/li\u003e\n  \u003cli\u003eCheck rear sensors and detection systems before installing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This harness is ideal for truck and SUV owners who already have a factory USCAR 7-way tow connector and want a clean, non-destructive way to power a 4-prong light bar or basic trailer lights. It’s targeted at DIY installers, fleet users, and anyone who prefers reversible, OEM-friendly wiring solutions that use pure copper conductors and a protected loom for durability.\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: Will this adapter work if my truck doesn't have a factory tow package?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The harness requires a factory USCAR 7-pin socket; it won’t function without the vehicle’s OEM tow connector.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I use this adapter for trailer electric brakes or 12V accessory power?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The 4-way flat supports lights and ground only; it does not provide dedicated brake-controller or auxiliary 12V power circuits.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Oyviny","offers":[{"title":"Default Title","offer_id":67588325834937,"sku":"B08THNVP7S","price":77.55,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/oyviny-front-view-uscar-7-to-4-harness.jpg?v=1790517973","url":"https:\/\/redleafauto.ca\/products\/oyviny-uscar-7-pin-to-4-pin-trailer-wiring-harness-41in-pure-copper-plug-and-play-adapter-for-led-tailgate-light-bars","provider":"Redleaf Auto","version":"1.0","type":"link"}