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Wiring up a trailer doesn’t have to mean tearing into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into existing vehicle connectors for a simple, no-splice setup. It’s all plug-in, so you can get your trailer lights powered up quickly and confidently without chasing down color codes or cutting insulation.
Electrical problems often start with corrosion, but this harness helps prevent that by using tight-fitting connectors that stay sealed against dirt and moisture. For even more protection, applying dielectric grease to the terminals before installation helps keep contaminants out, ensuring reliable lighting signals every time you tow.
If your trailer lights aren’t responding as expected, this harness makes it simple to test for power at the 4-way connector. You can quickly connect a circuit tester to see if the signal is present before diving deeper into wiring checks. That means less guesswork and faster fixes when you’re trying to get back on the road.
The integrated 4-flat connector delivers the essentials—running lights, brake lights, and turn signals—to most small and mid-size trailers. It’s the standard plug type found at the trailer end of countless setups, so you’re ready for straightforward, dependable towing connections.

Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
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Mike F.
5/8/2018
Both wiring harness that I purchased over the last 4 yearsone to a 2014 Tucson & one for a 2016 Accent continue to perform excellently with no issues. Maintenance has consisted of an inspection and sometimes application of WD-40 to minimize the tendency for corrosion of the contact pins. I am very satisfied with this product.