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Trailer wiring can be a pain if you have to splice into factory wires, but this harness skips all that. The Curt T-Connector plugs right into your vehicle’s existing wiring to give you a 4-pole flat trailer connector. No wire cutting, no guesswork—just plug it in and it’s ready to tow.
When towing, consistent lighting is non-negotiable. This harness includes a powered converter that draws power directly from the battery instead of the vehicle’s lighting circuit. That means stable voltage for your trailer lights and protection for your car’s sensitive electronics.
The hidden, plug-in setup keeps wires tucked out of sight and uses factory connection points for a clean finish. You won’t have loose wires hanging under the bumper, and the connector stays protected when not in use.
The 4-flat connector gives you running lights, turn signals, and brake lights—everything you need for pulling small trailers, utility haulers, or cargo carriers. It’s the standard connection for most light-duty towing setups, ready to go when you are.
This will not affect how the tail lights on your vehicle operate.
Customer Satisfaction Score:
94% were satisfied with this product
6% of customers were not satisfied
Ratings & Reviews
Come with everything needed
Great p roduct
It's a complete product. Everything went in according to the directions and I didn't need anything extra.
Great support, thx
Works perfectly
bolted right up and haven't had one iss ue
I gave it three stars because of the power wire everthing else was simple plug and play.
The harness works great. Pretty self explanatory to install. Took me about 2 hours start to finish.
Easy to use, all laid out for install. I recommend watching a YouTube video because it is a lot of wires.
I had my mechanic install the harness and he said it was an easy install. He also mentioned that it was a very high quality harness. we have not had any issues with the harness. works great.
Installed on my 2017 Impreza hatch. Was a bit of a pain to find a good place to run the 12g wire to the battery but other than that it was relatively simple and straight forward. I ended up using some metal loom clamps and zipties to run the wire underneath the car. I am very pleased with the product, Thanks Etrailer.
Very high quality product. Installation went exactly as described in the instructions. The reason I keep coming back to etrailer is because of their customer support and instructional videos.
Very happy to say when. hooked up my boat trailer this spring to start a new fishing season all my lights were working. So far everything very good!
Install went well as I am familiar with my car. I ran the power wire internally under the interior trim and through the fire wall to the battery to prevent weather exposure as I live in Maine. The instructions should be more car specific to help those not quite as familiar with their cars. Overall the quality is very good and wire lengths were spot on. I would highly recommend this product! Subaru Impreza has a wire channel drivers side under the door sill trim plates which works perfect for this install. All parts required for the install except tools came in the kit. I will be a repeat customer!
Much more difficult than other harnesses I have installed, due to the need for a direct connect to the battery. The instructions provide NO help for where to route the hot lead the length of the car, and the video has no details either. This is the most difficult and time-consuming part of the install, and neither Curt nor etrailer provide any guidance. Very disappointed.
Right channel was dead on arrival. The harness was easy enough to install, plug and play into the tail lights, then run a ground and a fused power. Easy enough. My unit has a faulty right channel, constantly outputs about a volt and a half, and will not pass stop or turn power through. This is my own fault, the unit I had sat in the packaging for over a year until I got around to installing it on my backup car when I discovered the faulty converter, the unit is now out of warranty. Ordering the Tekonsha instead. Never liked Curt for trailering electronics anyways.
Plug and Play at its best.
The vehicle we put the wiring & hitch on was a Subaru Impreza and it worked out great. We now have an Outback and are trying to decide if we will need a hitch & wiring for it too. Will let you know.
I've had the wiring harness in my Subaru Impreza for a year now. It does what I need it to and it's easy to pull out to use it. I remember it wasn't too difficult to install -- the hardest part was trying to be so smart about routing it and preventing future wear and tear. I think it was worth it because everything is okay so far!
Wiring it into my tail lights did somehow disable the trunk light, but that was probably my fault. I don't care enough about it to pull it all apart again and see what happened.
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.
Rachael H.
7/19/2019
We do have a help article that explains how to route the power wire of your wiring harness. I have provided a link for your reference.
Helpful Links
faq-Routing-a-Power-Wire.aspx