{"product_id":"oyviny-uscar-7-pin-to-4-pin-trailer-wiring-harness-41in-16awg-pure-copper-adapter-for-led-tailgate-light-bars","title":"Oyviny USCAR 7‑Pin to 4‑Pin Trailer Wiring Harness — 41in 16AWG Pure Copper Adapter for LED Tailgate Light Bars","description":"\u003cp\u003e\u003cstrong\u003eThe Oyviny Plug \u0026amp; Play USCAR 7-pin to 4-pin wiring harness converts a factory USCAR 7-way socket into a standard 4-way flat connector for powering LED tailgate light bars and basic trailer lights.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact adapter lets you tap the existing OEM USCAR 7-pin trailer tow plug on trucks and pickups to feed a 4-pin flat trailer plug without cutting or splicing vehicle wiring. Built with 16 AWG pure copper conductors and a protective slit loom, the harness maintains the factory 7-way connection while exposing Brake, Turn, and Tail signals to an added 4-pin output. It’s a straightforward option when you need a simple, temporary or semi-permanent wiring solution for under-tailgate light strips, small trailers, or auxiliary lighting.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this harness power an LED tailgate light bar?\u003c\/h3\u003e\n\u003cp\u003eThe adapter routes the vehicle’s brake, turn, and tail lamp circuits from the USCAR 7-way socket into a standard 4-pin flat plug, so a light bar can use those signals without modifying the factory loom. Installation plugs directly into the OEM USCAR port and provides a 4-way receptacle for the accessory.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePlugs into factory USCAR 7-pin socket — no wire cutting.\u003c\/li\u003e\n  \u003cli\u003e4-pin flat output supplies Brake, Turn, and Tail circuits.\u003c\/li\u003e\n  \u003cli\u003e16 AWG pure copper conductors for reliable conductivity.\u003c\/li\u003e\n  \u003cli\u003e41-inch cable length with slit loom for routing flexibility.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this affect vehicle safety systems like parking assist or trailer detection?\u003c\/h3\u003e\n\u003cp\u003eSome trucks with rear parking sensors, trailer detection or blind spot systems may interpret a connected light bar or 4-pin load as a trailer. That detection can change or disable certain driver-assist features when the adapter and accessory are attached.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVehicles with factory trailer detection may alter sensor behavior when a 4-pin load is present.\u003c\/li\u003e\n  \u003cli\u003eBackup assist or blind spot alerts can be disabled by the vehicle while a trailer load is sensed.\u003c\/li\u003e\n  \u003cli\u003eRecommended: confirm compatibility with your truck’s tow package functions before permanent installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and towing setups is this adapter compatible with?\u003c\/h3\u003e\n\u003cp\u003eThe harness is designed for trucks and SUVs equipped with a factory USCAR 7-pin towing socket. It’s common on many modern pickups and can accommodate aftermarket light bars or standard 4-pin trailer wiring requirements.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eIntended for vehicles with USCAR 7-way factory tow package only.\u003c\/li\u003e\n  \u003cli\u003eWorks with many GMC, Ford, Dodge Ram, Toyota Tacoma\/Tundra, Jeep and similar models when factory plug is present.\u003c\/li\u003e\n  \u003cli\u003eUseful for light bars, small trailers and trailer-style accessories needing a 4-flat connection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the build details and installation notes?\u003c\/h3\u003e\n\u003cp\u003eThe adapter uses durable black plastic connectors and a protective black slit loom over 16 AWG pure copper wire. The 41-inch harness length gives enough reach to mount a 4-flat receptacle under the tailgate or at the bumper for easy hookup.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e16 AWG pure copper conductors for stable electrical flow.\u003c\/li\u003e\n  \u003cli\u003eBlack slit loom for abrasion resistance and neat routing.\u003c\/li\u003e\n  \u003cli\u003ePlug-and-play mating: installs without cutting factory wiring.\u003c\/li\u003e\n  \u003cli\u003eKeep in mind vehicle-specific features that may be affected by an added load.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Oyviny USCAR 7-pin to 4-pin adapter suits truck and SUV owners who already have a factory USCAR 7-way tow socket and need a clean, reversible way to power a 4-flat accessory — commonly LED tailgate light bars, small trailers, or occasional towing where a full rewire isn’t desired. It’s best for DIYers and installers looking for a non-invasive, durable wiring solution; verify your vehicle’s tow package and driver-assist behavior before use.\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: Does this adapter require cutting my truck’s wiring?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — the Oyviny harness is plug-and-play, connecting to the factory USCAR 7-way without cutting vehicle wires.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will using this disable parking sensors or blind spot alerts?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It can on some models: vehicles with trailer detection may change or disable those systems when a 4-pin load is detected.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Oyviny","offers":[{"title":"Default Title","offer_id":48084639219870,"sku":"B08THNVP7S","price":40.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/oyviny-front-view-uscar-7-to-4-plug-harness.jpg?v=1785861323","url":"https:\/\/northtrailauto.ca\/products\/oyviny-uscar-7-pin-to-4-pin-trailer-wiring-harness-41in-16awg-pure-copper-adapter-for-led-tailgate-light-bars","provider":"North Trail Auto","version":"1.0","type":"link"}