Stop wrestling with splicers and tape. The CURT 56027 T-connector plugs directly into your vehicle's existing tail light wiring harness, passing through your factory signals untouched while adding a standard 4-pin flat output for your trailer. It takes about 15 minutes with basic hand tools and leaves your truck or SUV wiring completely reversible.
CURT's T-connector design is built around a simple principle: your vehicle already knows when to signal left, right, and brake -- this harness just taps into that information and passes it to your trailer without interrupting or modifying the factory circuit. The 56027 is a vehicle-specific fit unit engineered for select cars, trucks, and SUVs that use a compatible tail light connector configuration, making it a genuine plug-and-play install rather than a universal splice job.
The harness ships ready to install. Connect one end to your vehicle's tail light harness, run the 4-pin flat pigtail to your hitch receiver area, and you're done. No dielectric splicing, no wire taps, no risk of a short-circuit from a sloppy aftermarket connection.
Plugs directly into the factory tail light connector on each side. Factory plug passes through -- no wires cut, no tape, fully reversible.
Industry-standard 4-pin flat trailer connector carries left turn/brake, right turn/brake, tail/running lights, and ground. Compatible with the vast majority of small trailers, utility trailers, and boat trailers.
Molded connectors match OEM tail light harness plugs on compatible vehicles -- no adapter rings, no forcing. Clean fit every time.
At 0.54 lbs and packaged at 9 x 4 x 2 inches, the harness tucks neatly behind the bumper or along the frame rail without bulky hardware.
The 4-pin flat connector on this harness handles the four circuits required by most single-axle trailers and all DOT-required lighting functions for trailers under a certain gross weight:
This is the standard SAE 4-pin flat configuration used across CURT's wiring lineup and recognized by every trailer manufacturer building single-axle utility, landscape, boat, and cargo trailers.
The 4-pin flat output covers all lighting circuits required for trailers that do not have electric brakes or 12V auxiliary power needs. That includes:
Most installs follow this sequence -- no vehicle-specific expertise required:
Typical install time is 15 to 30 minutes for a first-timer with basic hand tools. No soldering, no test light probing, no wiring diagram required.