Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2018 Mini Cooper
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2018 Mini Cooper
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Wiring a trailer usually means cutting into factory wires, but this harness keeps things simple. The Curt T-Connector plugs directly inline with the vehicle’s tail light wiring and gives you a 4-flat connector for trailer lights. There’s no splicing or wire tracing—everything clicks together using factory connectors for a clean, hidden install.
The harness includes a powered converter that draws power directly from the battery through a fused connection. It uses a 10-amp inline fuse on the power feed and a 20-amp fuse that installs in the under-hood fuse box at position 10 labeled “Trailer Tow.” This setup protects both the vehicle and trailer circuits while ensuring consistent 12-volt power to your lights.
Some vehicles don’t come pre-wired for towing, leaving you without working trailer signals. This harness adds all four basic functions—running lights, turn signals, and brake lights—through its standard 4-flat connector. That means your trailer lights stay in sync with your vehicle’s lighting right out of the box.
If you want to expand beyond basic lighting, this harness sets you up for it. Once the 4-way is installed, you can plug in an adapter like a 4-to-7-way to run additional circuits or connect a brake controller later. It’s a solid foundation that lets you add towing features as your setup grows.
The converter box is sealed and weather-resistant to handle regular towing use. If it ever fails, the full harness can be replaced as one unit for straightforward maintenance. Curt backs it with a one-year limited warranty, so you can wire up and tow with confidence.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Bob P.
10/15/2022
Working great. not bad installing it either. I would recommend this product rather than try to wire it any other way.
Lee
11/29/2019
No problems at all and use it every few weeks.
Carl L.
8/16/2019
The kit was awesome. Exact fit and easy easy to install. And is working perfectly. And the plug in that comes with it that tells you all is working correctly Very nice
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Craig
11/25/2025
It lost my brake lights 3 weeks ago I had to remove it go back to original wiring