Stop splicing into your truck or SUV's factory tail light wiring and risking blown fuses, flickering lights, or voided warranties. The CURT 56322 is a vehicle-specific, plug-and-play wiring harness that taps directly into your existing OEM connector -- delivering a clean 4-flat trailer output without cutting a single wire. Designed for a precise fit on select vehicle applications, this harness takes the guesswork out of trailer wiring and gets you on the road in under an hour.
The CURT 56322 is part of CURT's broad T-One connector lineup -- one of the most trusted families of vehicle-specific trailer wiring harnesses in the aftermarket. Unlike universal wiring kits that require you to tap, splice, and solder into factory circuits, this harness is engineered to match the exact OEM connector locations on compatible vehicles. You unplug the factory tail light connector, plug the CURT harness in between, and route the 4-flat output to your hitch receiver. That's it.
This approach keeps your vehicle's electronics fully protected. No current is pulled directly from the factory bulbs, and no wires are permanently altered. If you sell the vehicle or remove the harness, the factory wiring is untouched.
Plugs directly into OEM tail light connectors -- zero cutting or splicing into factory wiring required.
Delivers standard 4-way flat connector: left turn/brake, right turn/brake, tail lights, and ground.
Engineered to match exact OEM connector geometry on compatible vehicle make/model/year combinations.
Most installations complete in under one hour with basic hand tools -- no wiring diagram required.
CURT's T-One connectors (which include the 56322) use a converter module that reads your vehicle's existing tail light signals and translates them cleanly to the standard 4-flat trailer format. This is especially important on modern vehicles with LED tail lights, CAN bus electrical systems, or combined turn/brake functions -- situations where a simple splice can confuse the vehicle's body control module or trigger warning lights on the dash.
The 56322 harness includes an in-line circuit converter (also called a loop module or T-connector module) that handles this signal conversion transparently. Your trailer's turn signals, brake lights, and running lights will function exactly as expected without any dashboard warnings or electrical gremlins.
The 4-way flat connector output on the 56322 is the most widely used trailer connector format in North America. It supports:
This connector format is compatible with most utility trailers, boat trailers, small enclosed cargo trailers, pop-up campers, and lightweight travel trailers. If your trailer uses a 5-flat, 6-round, or 7-way RV blade connector, you will need a separate adapter -- the 56322 itself outputs a standard 4-flat.
CURT designs the 56322 so that a competent DIYer can complete the install in a typical driveway setting. General steps follow this pattern:
CURT is one of the largest and most comprehensive trailer hitch and towing accessory brands in North America. Their custom wiring harnesses are engineered using vehicle-specific OEM connector data and are tested against SAE J1500 trailer connector standards. The T-One connector family covers hundreds of vehicle applications from compact SUVs to full-size pickups to minivans, and CURT updates fitment data regularly as new model years are released.