To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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Wiring a trailer doesn’t have to mean hacking into your vehicle’s wiring. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into existing factory connectors. It’s a straightforward plug-in setup that skips wire tracing or splicing, making it perfect for DIY installs.
The integrated converter takes care of turn, brake, and running light signals so your trailer lights function exactly as they should. It pulls the correct signals from your vehicle wiring and delivers them cleanly to the 4-flat trailer connector, helping prevent warning light errors or fuse issues.
Once installed, this harness stays tucked out of sight. The hidden plug-in design routes wiring along factory paths, keeping everything secure behind trim or panels. That means your wiring stays protected and your vehicle keeps a clean look even when you’re not towing.
The 4-flat plug gives you the standard connection for running lights, brake lights, and turn signals. It’s the go-to setup for most small and mid-size trailers, so you can hook up and go without adapters or extra hardware.

Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews

Everett
9/22/2025
This product is still working great and I really am happy with my trailer. After I installed my 1 14 hitch the 2 option became available. I wish I had the 2 hitch because I think my bike rack would rock less from side to side.

Katrina D.
1/9/2024
I am sorry for any confusion on this. I have gotten in contact with the manufacturer and they have confirmed that, yes this fits an AWD Prius. We would need to know what you do have to recommend the correct harness.

Laraine
1/9/2024
2022 Toyota Prius eco FWD
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David P.
4/23/2026
It’s been a month and it still works!