Get your trailer lights wired correctly the first time. The CURT 56272 is a vehicle-specific, plug-and-play wiring harness that connects directly to your factory tail light wiring -- no cutting, no splicing, no guesswork. It delivers clean, reliable trailer lighting signals through a standard 4-flat connector, keeping your tow vehicle's electrical system intact and warranty-friendly.
CURT's custom wiring harnesses are engineered to match the specific tail light wiring architecture of select vehicle makes and models. The 56272 uses OEM-style connectors that plug directly into your existing tail light harness -- on one side to the vehicle, on the other side to the trailer's 4-flat plug. No T-one adapters, no stripped wires, no electrical tape bundles under the bumper.
This harness is part of CURT's broad custom wiring lineup, which covers hundreds of vehicle applications from late-model trucks and SUVs to minivans and crossovers. Each harness is designed to handle the vehicle's specific signal type -- whether that's a simple incandescent system or a more complex CANBUS-based lighting circuit -- and routes a clean, correctly converted signal to your trailer connector.
OEM-style connectors plug directly into factory tail light sockets -- no wire cutting or splicing required for a clean, reversible install.
Standard 4-flat output (left turn/brake, right turn/brake, tail/running, ground) fits the majority of trailers, boat trailers, utility trailers, and RV tow dollies.
Matched to the exact wiring layout of compatible vehicles -- no adapter guessing, no resistor add-ons for most fitments.
Weather-resistant connectors and insulated wiring stand up to road spray, UV exposure, and the vibration demands of regular towing use.
The 4-flat (also called 4-pin flat) is the most common trailer connector standard in North America. It carries four functions on four flat pins arranged in a row:
This four-function layout supports all basic trailer lighting requirements -- tail lights, brake lights, and turn signals -- and is compatible with boat trailers, single-axle utility trailers, cargo trailers, and most lightweight RV accessories like tow dollies and small popup campers. It does not carry a dedicated brake controller circuit or 12V auxiliary power; for those functions a 5-flat or 7-way connector is required.
No wiring experience is required for a typical install. The general process is: