Stop wrestling with universal wiring kits that require cutting and splicing your factory harness. The CURT 56274 is a vehicle-specific T-connector harness engineered to plug directly into your vehicle's existing tail light wiring, delivering a clean 4-flat output for trailer brake lights, turn signals, and running lights -- no electrical tape, no butt connectors, no warranty headaches.
CURT's custom fit wiring harnesses are designed to match the exact connector configuration of a specific vehicle year, make, and model. The 56274 uses CURT's T-One connector approach: one end plugs into the factory tail light socket, the other receives the original factory bulb, and a third pigtail outputs to a standard 4-flat trailer connector. The vehicle's own wiring does the heavy lifting -- no tapping, no splicing, no risk of blowing a fuse or triggering a check-engine light from a poorly joined ground.
CURT harnesses in this family are SAE-compliant and designed to work with the factory lighting circuit's existing load. They are passive connectors -- they do not include a brake controller, surge protector, or converter module. If your tow vehicle uses LED tail lights and you are towing a trailer with incandescent lamps (or vice versa), verify load compatibility before purchase; some pairings may require an add-on converter.
Plugs directly into factory tail light sockets. Zero cutting into OEM wiring. Preserves factory warranty and circuit integrity.
Standard 4-wire flat trailer connector output -- compatible with virtually all light-duty trailers, utility trailers, boat trailers, and cargo trailers.
Engineered for a precise year/make/model application. No adapter fumbling, no universal guesswork -- connectors mate the first time.
Ships at 1.46 lbs in a 9 x 6 x 3 inch box. Everything needed for a complete install is included in a single tidy kit.
CURT's T-One connector concept is one of the cleanest approaches to trailer wiring in the aftermarket. The harness literally intercepts the tail light circuit at the bulb socket -- you unplug the factory connector, plug in the CURT harness, and the original bulb plugs back into the pass-through on the harness. The 4-flat pigtail exits the rear bumper area and stows away when not towing. Install time on most vehicles is under 30 minutes with basic hand tools.
Because the harness is custom-made for a specific vehicle, the wire lengths are cut to reach each tail light location without excess slack bunching up in the trunk or cargo area -- a detail universal kits consistently get wrong.
The 4-flat connector carries the four standard lighting functions required by federal law for trailers operated on US roads:
This harness does not carry a dedicated brake controller output (blue wire), a 12V accessory circuit (red wire), or a backup light signal. For those functions, a 5-flat or 7-way connector system and separate wiring are required.
CURT part 56274 is a vehicle-specific harness. Based on CURT's product family structure, this part number fits a defined set of vehicle year/make/model combinations. Common application categories for CURT 5627x-series harnesses include late-model domestic SUVs, crossovers, and pickup trucks. Verify your exact vehicle fitment using CURT's online vehicle selector or the fitment data on the product listing before ordering.