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Wiring a trailer doesn’t have to mean cutting into factory wires. This Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into existing tail light wiring for a clean, factory-style connection. It’s built for vehicles without a tow package and provides a reliable 4-flat trailer output for running lights, turn signals, and brake lights.
The harness installs from inside the vehicle and connects behind the tail lights, so you don’t need to run wires under the vehicle or through tight spaces. When you’re ready to tow, you simply pull the 4-flat connector from the cargo area and route it out to the trailer. When you’re done, it stores neatly back inside, protected from dirt and moisture.
The included powered converter keeps your trailer lights operating smoothly without overloading your vehicle’s electrical system. It supports up to one stop/turn light per side at 2.1 amps each and up to 5 amps total for tail lights. A solid ground connection on clean bare metal ensures consistent performance and helps prevent flickering or signal loss.
Starting with this 4-way setup gives you flexibility to expand later. If you add trailer brakes or need a 12V charge line, you can easily upgrade by pairing it with adapters like part #37185 or #ETBC7. That makes this harness a solid base whether you’re towing small utility trailers now or planning to pull something heavier later.

Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews

Norman
2/3/2015
Unfortunately the trailer hitch lasted longer than the car I installed it on. The hitch worked well for the time I used it.

Jenny N.
8/24/2023
It is very unusual for that to have happened. This would be covered under the warranty for the harness.

Gwendolyn Y.
10/24/2025
Hey, Kevin. I'm really sorry to hear that you're harness is not working for you. I'm going to reach out and get this taken care of for you.

Albert
3/25/2025
Item still working as it should and I like buying from this company. Theyre responsive to questions and this is what they do.
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Gary B.
12/8/2018
Great. Looks great installed and weathers well.