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Wiring a trailer doesn’t have to mean cutting into factory wires. This Curt T-Connector plugs directly into the vehicle’s tail light circuits so you can add a 4-flat trailer connector without any splicing. Everything fits behind the tail lights for a clean, factory-style install that’s quick to finish.
Some trailers can overload weak wiring, but this harness uses a powered converter that can handle up to 7.5 amps per circuit. The converter draws power directly from the vehicle battery through its dedicated 12-volt lead, protecting the vehicle’s wiring while delivering steady current to the trailer lights.
The power wire connects to the main battery under the hood—the one charged by the alternator—so the system runs safely without affecting other vehicle systems. The converter only sends power when trailer circuits are active, so it won’t drain the battery when nothing is plugged in.
You can route the black power wire several ways depending on what works best for your setup. Many installers choose to run it through the interior for a cleaner path from the trunk area to the engine bay. The harness design keeps things straightforward no matter which route you take.
The 4-pole flat connector delivers running, turn, and brake signals—everything most small and mid-size trailers need to stay legal and visible on the road. It’s a standard plug type that works with common trailer wiring setups right out of the box.
Customer Satisfaction Score:
89% were satisfied with this product
11% of customers were not satisfied
Ratings & Reviews
Matthew C.
4/15/2015
used to pull my boat trailer, and works well
Laura E.
8/23/2017
Mike, for additional assistance in routing a power wire, check out this helpful article:
Helpful Links
Ron P.
11/13/2017
No problem with the system since installation
Jakob
2/15/2022
As far as durability goes. I have had no issues with over a year of use so far
Do you have a question about this Custom Fit Vehicle Wiring?
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Chuck L.
7/17/2018
I use a small trailer quite often with my Malibu. There has been no issues with the wiring kit or the hitch. I expect it will last the life of the vehicle. Thanks for the followup email.