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Wiring a trailer doesn’t have to mean cutting into your vehicle’s wiring. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into factory tail light connectors, giving you a clean install without splicing. Each side clicks in behind the tail lights, and that’s it—no guesswork, no wire tracing.
The harness includes a powered converter that draws power directly from the battery through a single black hot lead. This design shields your vehicle’s wiring from overloads or shorts that can occur on the trailer side. In the event of a short, the converter box takes the hit instead of your vehicle’s electrical system, keeping the factory circuits safe.
Once the T-connectors are plugged in, you only need to run one wire up to the battery. That wire connects to an inline fuse holder and the positive terminal for steady 12V power. It’s straightforward and easy to route using existing paths under the vehicle, making this an approachable project for DIY installers.
With a standard 4-flat connector at the back, this harness powers running lights, brake lights, and turn signals on most small and mid-size trailers. Once installed, it’s ready to plug in and tow safely with consistent light operation every time.

Customer Satisfaction Score:
98% were satisfied with this product
2% of customers were not satisfied
Ratings & Reviews

Nick
8/28/2025
Great product, 0 problems!


Brooke M.
3/27/2025
Thanks, Blaine! It's nice to have an idea on what to expect with this install

Katrina D.
12/19/2023
Whenever you do use it, we will love to hear how it works for you!

Jeff
3/7/2025
It worked out well


Victor
12/22/2023
Year update , my harness still working flawlessly, no issues at all. Customer reps. Still reach out after a yr. To check if all is good. What does this say about them. 10??rating company. Always a pleasure
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Vern
8/7/2026
Very well No problems