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:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
Fast, friendly service. Arrived on time
Nice
Did exactly what was needed
Please update Curt that this is the correct cable for 2020 Prius... Regular Prius.
Excellent service! Third time purchasin g!
Wrong size. When I took wiring harness to my mechanic he said it would not be a quick way to wire
Bought from another source
Wiring harness did not have the right year on it and said it was for all wheel drive and I don’t have all wheel drive.
Laraine
1/9/2024
2022 Toyota Prius eco FWD
Very satisfied. They succeeded my expec tation.
Fit exactly video , plus written instructions made it a breeze.
ease of installation, fit.
good product ..i did my whole install on ramps in three hours..its smart to do wireing first..you can intall hitch alone if you take the rear outside facia off and put one long extra bolt in bacwards on each side to halp aloghnment while holding both in place with one hand.be carefull not to let fall on you!
I purchased a Curt harness for my 2019 Toyota Prius AWD-e. The order was confirm almost immediately. The order arrived in the mail 1-1/2 days later. The instructions were clear and precise. 2 hours later, everything worked just as it should and I was pulling my ultralite utility trailer to the landfill.
Thank you etrailer and Curt.
You came through again. Thank you. This harness worked as you said. I’m very happy.
installation went without a hitch after we contacted etrailer for help. etrailer help desk was great.
Very easy to install, best if done at same time as hitch install. By myself it took maybe 3hrs.
great service and product
The install video was a huge help and the product fit my year and model vehicle perfectly.
This worked on my 2021 Prius FWD. I use the cigarette lighter socket to for power because I don't have any lift to work under the car, and this way I only use the car's power when I use the trailer. I am so glad to be able to use my trailer again. The sales people at trailer.com were so helpful in finding the right adapter for my car.
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.
This harness is compatible with 2021 Toyota Prius Limited FWD. The one Amazon suggests is not. Thank you etrailer for being competent.
David P.
4/23/2026
It’s been a month and it still works!
Claire H.
4/23/2026
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
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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.