To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Wiring for towing can be tricky, but this Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector keeps it easy. It’s a plug-in design that connects directly to your vehicle’s tail light housing with no splicing or wire tracing needed. The connector with the yellow wire goes to the driver side tail light housing, and the connector with the green wire goes to the passenger side. Once it’s in place, you’ve got a clean, hidden install that’s ready for towing lights.
This harness comes with a powered converter that isolates and protects your vehicle’s sensitive wiring from the trailer’s electrical system. It ensures consistent power delivery to the trailer lights while preventing feedback or overload on your car’s circuits. That means stable lighting every time you hook up, even if your trailer system uses a different wiring setup.
The 4-flat connector gives you all the essential lighting functions – running lights, turn signals, and brake lights – so your trailer is visible and road legal. The wire colors make setup simple: Green for right turn/stop light, Yellow for left turn/stop light, Brown for running light, and White for ground. Everything is clearly labeled and ready to go.
No factory tow package? No problem. This harness is built for vehicles that didn’t come prewired for towing. It provides everything needed to get a trailer connected quickly and safely. Once plugged in, your vehicle is fully set up with trailer lighting capability—no extra factory parts required.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
Great
easy install, works great!
Nice product.
works just like the package says. easy install
Good part. I bought this for my van and works well.
It's very easy to hook up I'm glad I bought it works great no problems
Nice quality because the shank that goes into the hitch is solid but hallow like the ones from other sources.
In my case, it arrived securely packaged within the Hidden Hitch box. At the writing of this 'review' - I haven't installed it yet. TBD.
Well made, easy to install and worked perfectly.. We just sold the car and I removed the wiring harness so I can install it in our next fiat.. Highly recommend this product. Mahalo
Easy installation with the exception of routing the hot lead to the battery. A recommended path would be an improvement here as the coil springs must be avoided.
Michael S.
5/19/2018
No problems.
Rachael H.
5/19/2018
Helpful Links
What makes this hitch system a sure winner is the absolute ease and accuracy of the installation. The video is an outstanding addition to walk you through almost everything. I say almost, because the one missing element is a 'how-to' on installing the positive lead to the battery. I'm still wrestling with whether or not to run it internally or externally. Aside from that, I was able to put the rear of my 2013 Fiat Abarth on solid stands which gave me ample room to do everything. Although the video suggested pulling additional supports off of the exhaust system to make it easier, I found that it wasn't necessary (and besides, since the car wasn't on a lift, as in the video, accessibility was a bit tougher). The entire installation took about an hour because I was pausing periodically to watch the video and make sure I wasn't missing anything. Someone more mechanically skilled could probably do this in less than 30 minutes. Well done, etrailer!
Hesitated for a few weeks ,,,,looked at obstacles ,, then got down to getting it installed. Took me 3 hours fiddling with details and it was completed . A week later one of the taillight fixtures was not locked in perfectly,,, loosened 2 screws and reset the fixture , retightened 2 screws, done
Robert
5/31/2024
A year later ! I’m impressed with the wiring harness,,,, no adjustments needed or failures,,,,did replace a trailer lite lens that broke and added a pair of amber side lights and had no effects on the harness
Excellent new "plug & play" version to the outdated wire splice type. Solid and dependable. Exact fit for our Fiat. Using the system currently. 5 Stars.
Gary K.
6/20/2023
Perfectly. The pigtail wiring is used at least 4 days a week for our mini-trailer for hauling items too large for our hatchback. Still 5 stars!
Missing a gasket. This worked well and included quality wire power supply/ground wire. Butt-connectors were of the cheap variant, though, not water resistant by any means. Instructions aren’t clear, no indication of what side the module goes on vs what side the green wire goes. Fine print at the bottom of the instruction sheet showed a wiring legend. Green wire is right. Got it.
The green-wire side T connector is missing its water resistant gasket. Filled it full of dialectic grease to get me going for now.
Easy installation
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.
John
3/30/2026
Simple install. Worked as advertised