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Wiring for a trailer doesn’t have to mean cutting into your vehicle’s factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs right into the factory tail light connectors. It’s a true plug-and-play setup that gets you trailer-ready without splicing or modifying anything.
This harness uses a powered converter that draws power directly from the vehicle’s battery through a dedicated hot lead. That setup keeps the trailer lights from pulling current through your vehicle’s lighting circuits, protecting sensitive electronics and preventing overloads—especially useful when running LED trailer lights.
The kit includes the wire you’ll need to run power straight to the battery, and it’s protected by an inline fuse to guard against shorts. Following the recommended route to the battery ensures a clean, reliable install with stable voltage for all trailer light functions.
Once installed, the 4-flat connector gives you everything you need for safe towing—running lights, turn signals, and brake lights. It’s the standard trailer link for small and mid-size trailers, giving you dependable lighting every time you hook up.
The 4-way plug fits snugly with your trailer connector to maintain a solid electrical connection. Adding dielectric grease helps keep out moisture and corrosion so your lights stay bright and connections last longer.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Thomas
10/5/2021
I have had no problems with the t connector. I did not connect the hot wire to the battery. I connected an old style cigarette lighter plug to the power wire along with the included fuse holder which I plug into the 12 volt power outlet in the storage area of my 2018 Ford Escape.This provides plenty of power to power the lights on my boat trailer which is all Leds. It would probably power about any trailers lights. I store it under the spare tire cover when not in use.
Heather A.
11/3/2021
Otmar R.
5/29/2019
Without any problems
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Brooke M.
6/22/2025
That's awesome, Perry! So you're a Veteran? Thank you for your service! Which branch of the military did you serve in?