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Wiring a trailer doesn’t have to mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs in behind the tail lights using OEM-style connectors. It gives you a clean, splice-free connection that keeps your factory wiring intact and ready to tow.
Some vehicles can’t power both sets of tail lights at once. This harness solves that with a built-in powered converter that draws power directly from the battery instead of the tail light circuits. That keeps the vehicle wiring protected while delivering consistent current to the trailer lights for safer towing.
The included 4-pole flat connector provides the basic lighting functions every small or mid-size trailer needs—right turn, left turn, brake, and running lights. It’s the standard plug on most cargo carriers and utility trailers, so you’re ready to hook up and go.
The converter’s power wire is designed to route straight to the vehicle’s battery. That ensures a steady power supply to the trailer lights without interference from other circuits. Once connected and sealed, it delivers reliable performance trip after trip.
Built for dependable operation, this Curt wiring harness comes with a 1-year limited warranty. It’s made to handle routine towing demands while keeping your lighting setup simple and safe.
Customer Satisfaction Score:
86% were satisfied with this product
14% of customers were not satisfied
Ratings & Reviews
great service
Works great. Installs in a flash.
Very nice and very easy to install. Lincoln MKT 2019
Exactly what I needed
Easy to install. Working well. No issue s.
Ordering was easy. Two days later I received an email that my order had already shipped. Received another that it had been delivered. I was very impressed with all the follow-up.
Great product. No splicing makes it easy. A couple observations: Could've used some more zip ties, and the double sided tape included for mounting the controller didn't stick so I had to use hot glue. And the connector to the trailer wiring didn't fit with the brand new connector on my trailer, so I had to modify a bit.
The lighting kit was easy to install, requiring a drill for the ground wire and somw fishing of wires through the panels of the vehicle. I used several ZIP ties for the positive lead to the battery to ensure the wire would not be damaged by anything on road. More ZIP ties would be nice, but they are eqasily sourced.
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Michael
10/9/2025
It failed 4 months after I bought it. I was not happywith it