{"product_id":"curt-56040-vehicle-side-4-pin-trailer-wiring-harness-easy-plug-in","title":"CURT 56040 Vehicle-Side 4-Pin Trailer Wiring Harness - Easy Plug-In","description":"\u003cp\u003eIn this review of the CURT 56040 trailer wiring harness the bottom line is simple: this is a smart, no-fuss solution for Subaru owners who need a standard 4-pin trailer connection without cutting or splicing vehicle wiring. Designed specifically for select Subaru Ascent, Forester, Outback, Crosstrek and XV models, the harness plugs into the factory wiring and provides reliable power to trailer tail lights, brake signal lights and turn signals. It is best for DIY owners who want a clean OEM-style install and dependable lighting performance for routine towing.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to install:\u003c\/strong\u003e The plug-in T-connector design requires no cutting, splicing or soldering, so installation is fast and reversible.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard 4-pin connector:\u003c\/strong\u003e Supplies tail, brake and turn signal circuits with a universal 4-flat plug for common trailers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVehicle-specific fit:\u003c\/strong\u003e Custom-fitted for select Subaru Ascent, Forester, Outback, Crosstrek and XV models to ensure correct connector placement and minimal routing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliable power delivery:\u003c\/strong\u003e Built with surface mount technology to produce less heat and maintain consistent light intensity under load.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeather protection:\u003c\/strong\u003e Includes a rubber dust cover to protect the 4-way flat connector from moisture and dirt when not in use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis harness is ideal for Subaru owners who tow occasionally and want a simple, OEM-compatible wiring solution that preserves factory wiring integrity. DIYers who prefer a plug-and-play approach will appreciate the minimal tools and time required for installation.\u003c\/p\u003e\n\u003cp\u003eIts less appropriate for users who need a 7-way connector, integrated trailer brake control, or custom wiring beyond basic lighting circuits. If a vehicle does not appear on the compatibility list, owners should seek a model-specific harness for their make and year.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePlug-in installation saves time and avoids permanent changes to the vehicle wiring.\u003c\/li\u003e\n\u003cli\u003eCustom fit for specified Subaru models results in clean routing and secure connectors.\u003c\/li\u003e\n\u003cli\u003eDurable construction and surface mount circuitry deliver consistent light performance.\u003c\/li\u003e\n\u003cli\u003eIncludes a rubber dust cover to extend connector life in outdoor conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOnly provides a 4-way flat connector, so owners needing auxiliary power or brake controller wiring must purchase additional adapters.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eCURT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector type\u003c\/td\u003e\n\u003ctd\u003e4-pin 4-flat trailer connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVehicle fit\u003c\/td\u003e\n\u003ctd\u003eSelect Subaru Ascent, Forester, Outback, Crosstrek, XV\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003ePlug-in T-connector, no cutting or splicing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eRubber dust cover for weather resistance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuit technology\u003c\/td\u003e\n\u003ctd\u003eSurface mount technology for reliable power\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe CURT 56040 is a practical, cost-effective option for Subaru drivers who need a dependable 4-way trailer lighting connection without modifying factory wiring. Its vehicle-specific fit, easy plug-in installation and durable components make it a good value for routine towing tasks, provided a 4-pin connector meets your needs.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this harness require cutting into my vehicle wiring?\u003c\/strong\u003e\u003cbr\u003eNo. The harness uses a vehicle-side OEM-compatible plug so no cutting or splicing is required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the harness support brake controller functions?\u003c\/strong\u003e\u003cbr\u003eThe 4-pin connector supplies tail, brake signal and turn lights but does not provide a dedicated brake controller circuit or 12V auxiliary power.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIs the connector weather resistant?\u003c\/strong\u003e\u003cbr\u003eYes, the kit includes a rubber dust cover to protect the 4-flat connector when not in use.\u003c\/p\u003e","brand":"CURT","offers":[{"title":"Default Title","offer_id":48669994549467,"sku":"B0031G8GME","price":52.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/7195UiV3SwL._AC_SL1500.jpg?v=1778691302","url":"https:\/\/gearmusthave.com\/products\/curt-56040-vehicle-side-4-pin-trailer-wiring-harness-easy-plug-in","provider":"GearMustHave","version":"1.0","type":"link"}