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Wiring a trailer doesn’t have to mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 5-Pole Flat Trailer Connector plugs directly in line with the tail light wiring for a clean, plug-and-play setup. There’s no splicing or guesswork—just connect the harness and you’re ready to tow.
Standard 4-pole wiring covers running, turn, and brake lights, but this harness adds a fifth circuit for electric reverse lockout or backup lights. That extra pin is especially handy for trailers with surge brakes that need to disengage when backing up. It also keeps your setup ready for boat or utility trailers that use the same feature.
If you ever want to add a brake controller or 12V power circuit later, this harness makes that upgrade straightforward. Use it as the starting point for a 7-way setup by connecting it to a universal installation kit. That way you can expand your towing capability without redoing the entire wiring job.
The included converter ensures the trailer lights work properly with your vehicle’s wiring without overloading circuits. Because it ties in through OEM-style connectors, the setup stays tight and reliable over time. It’s a simple way to get dependable trailer lighting with built-in protection for the vehicle’s electrical system.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Gabriel
12/13/2021
Still going strong after a year. No complaints.
Ted
1/23/2023
Working just fine. Mostly happy with easy installation.
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Steve
10/25/2025
I replaced the vehicle with an identical model only 7 years newer. Your hitch and wiring harness were so much better than what came on the newer Tacoma that I swapped them out. Not that much extra work for a superior product, especially since I am keeping this truck for as long as I can.