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.
Trailer wiring can be a hassle if you have to cut into factory wires. This Curt T-Connector solves that with a true plug-in design. It connects directly to your vehicle’s existing tail light plugs, creating a 4-pole flat trailer connector without any wire splicing or guesswork.
Many vehicles with LED lights or sensitive electronics can’t share power safely with a trailer. The built-in powered converter on this harness takes care of that by drawing power directly from the battery, keeping the trailer lights bright and the vehicle circuits protected from overload.
With its hidden routing design, this harness tucks neatly behind panels and routes through factory grommets, keeping your install clean and protected. No dangling wires or exposed splices—just a seamless connection that looks like it came built-in from the start.
The 4-flat connector gives you all the essentials—running lights, brake lights, and turn signals—so it’s perfect for towing small trailers, utility haulers, or cargo carriers with lights. It’s built for reliability and stays weather-resistant for long-term use.
Customer Satisfaction Score:
90% were satisfied with this product
10% of customers were not satisfied
Ratings & Reviews
Looks good. Arrived promptly Thank you
Perfect!
First, let me tell you that the wiring harness fits like a glove and was easy to install with the enclosed instructions.
Second, after I installed the kit on my 2024 Toyota Cross a "Check engine light" came on so I rechecked the install and could not find anything wrong. I took it to the local Toyota dealer and ran a diagnostic test and determined that it was not a Toyota issue and charged me about 300 bucks. It was determined that on one side of the wiring install I did I blocked one of the proximity sensors and they all had to be recalibrated at the tune of $400.00 more. I had the work done and returned home to see if I had misread the install instructions from etrailer and there was no mention of avoiding sensors.
I called etrailer and shared with them my situation and that I thought they should have mentioned in the instructions that for cars with the Proximity Sensor System, take caution NOT to block the rear sensors when you drop the wires down through the tail light cavity, and would they refund me the cost I incurred. They went from friendly to very stern in their reply and stated they would not but they would correct their instructions. The last time I checked, they had not.
Third, I have been a customer of etrailer for over 40 years and having a car lift in my garage, I have installed a lot of their hitches, wiring kits, weight distribution hitches, lights, brake controllers and many other things for myself and friends without ever having an instruction issue. I'm sure the rear and front mounted trailer hitches count is over 20, maybe 25.
Do you have a question about this Custom Fit Vehicle Wiring?
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. Let us know if anything is missing or if you have any questions.
Kate F.
9/3/2025
Hello Douglas, thank you for sharing your experience. I’m really sorry to hear about the frustration you’ve run into, I know I’d feel the same way in your shoes. Just to clarify, the installation instructions actually come directly from Curt, the manufacturer, so we aren’t able to make changes to them ourselves. I will look into this further.