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Hooking up trailer wiring doesn’t have to be complicated. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs straight into the vehicle’s wiring, so there’s no need to cut or splice factory wires. The plug-in design keeps things simple and helps you get your trailer lights working in no time.
This harness includes a powered converter that connects directly to the vehicle battery. That built-in power source keeps the trailer lights from overloading the vehicle’s taillight circuits. It draws power only when the lighting functions are active, giving you reliable performance without draining the battery.
The 4-flat connector provides the running, turn, and brake light signals your trailer needs for safe travel. It’s the most common trailer connection out there, making it easy to hook up to most small and mid-size trailers without extra adapters.
When it’s not in use, keep the 4-way end covered to protect it from dirt and corrosion. For a solid electrical connection every time, apply dielectric grease at plug points and make sure the ground is attached to clean, bare metal. These small steps help the Curt T-Connector stay dependable whether you tow often or just occasionally.
The harness is rated to deliver 5.6 amps on the running light circuit, giving it enough capacity for typical trailer marker and clearance lights. Follow proper installation practices—especially grounding and fuse protection—and you’ll have stable lighting that performs trip after trip.
Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews
Jim P.
4/21/2016
Everything is working well. Im glad to have etrailer my primary source for my towing needs. Respectfully,
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Donald A.
6/20/2026
A year later it still works I havent used it that often so far so good