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Hooking up trailer wiring doesn’t have to mean cutting into factory wires. This Curt T-Connector plugs straight into existing vehicle connectors to create a 4-flat trailer plug. It’s a hidden, plug-in design that keeps everything clean and simple—no wire tracing, no splicing, and no guesswork.
Some vehicles can’t handle trailer lighting loads on their own, but this harness takes care of that. The powered converter delivers consistent power to the trailer lights while protecting the vehicle’s sensitive electronics. You get stable performance for running, turn, and brake lights every time you hitch up.
The 4-pole flat connector provides the basic lighting functions most trailers need—running lights, brake lights, and turn signals. It’s the standard setup used by small and mid-size trailers, so you can plug in and go without needing adapters or extra wiring.
Instead of a bulky external harness, this kit tucks away neatly using factory connection points. The hidden plug-and-lead setup keeps the install out of sight and protected from road grime, giving you a clean look that still delivers full trailer lighting capability.
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
Ratings & Reviews
Easy install
I got everything ahead of original schedule. Thank you.
Worked great and perfect fit. Unfortunately Kia made the car a pain to install That’s no fault of Curt.
Easy too install. If installing on a 2025 Kia Carnival though the instructions for the tail light removal is misleading. It says to remove the tail lights by pulling outward on them from the side of the vehicle but the tail lights have to be pulled out by standing behind the vehicle. But the lights work great. Will be towing a trailer across country so will update review after.
Product seems good so far but the installation instructions are not accurate. It suggests you pull the taillight out to the side after removing the two screws. the assembly MUST be pulled straight back not to the side. pulling to the side will brake the alignment pins!
The harness seems to be high quality and works well. My only suggestion is that heat shrink tubes should be provided to go over the crimped connections.
It works and does what it should! The dealer told us at least 3 times they couldn't figure out any sort of wiring harnesses that would work but look at me, I'm smarter than a dealer mechanic again
Do you have a question about this Custom Fit Vehicle Wiring?
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Brooke M.
6/7/2025
Thanks for the heads up tip about the lights! That is good to note. When do you embark on the road trip?