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Modern vehicles use delicate wiring and electronics that can’t handle extra load from trailer lights. This harness uses a powered converter that senses the vehicle’s brake, turn, and running light signals and draws power directly from the battery instead of the factory circuits. That means your trailer lights get reliable power without risking blown fuses or error codes in your vehicle’s system.
Instead of splicing into wires, the harness plugs in behind each tail light housing. It picks up the signals it needs right there and sends them through the converter box to the 4-pole flat connector. No complicated tracing or cutting—just unplug, connect, and route the converter’s leads where they’re protected from moving parts and weather.
The included converter box is fully sealed, so you can mount it on the vehicle exterior without worry about water damage or corrosion. Once secured with the double-sided tape on a clean surface, it stays out of the way yet close enough for easy access when routing wires.
The harness includes an inline fuse holder, ring connectors, and a butt connector for running the 12-volt power wire straight to the battery. That fused line protects both your trailer and vehicle wiring while delivering steady current to all lighting functions through the 4-flat plug.

Customer Satisfaction Score:
88% were satisfied with this product
12% of customers were not satisfied
Ratings & Reviews
Very pleased with etrailers.com! Shipping was fast and the product is high qualIty. The harness was easy to install except running the wire to the battery. There are not many good places to run a wire under the car, I ran mine inside. Overall great experience!
I've been happy with the wiring harness.
It works well and has been durable.
Hitch and light hookups. Pleasant professional phone contact. Great educational text and video. Excellent value and prompt delivery. Nothing could have been improved upon. Shipped to Annapolis for Subaru.
Overall pretty good. The appropriate amount of wire was sent, however the quality of the fuses and whatnot were on the low side. I ended up using my own inline fuses as well as my own double sided tape, even the zip-ties were cheap so I used my own there as well.
The harness doesn't work. Power goes into black converter module but no power coming out.
Was exactly as advertised. Fairly easy to install with some standard tools. I recommend soldering the wires instead of butt connectors. Only issue was adhesive pad was not sticky at all. But some gorilla tape did the trick.
Install was pretty easty for the most part. Plug and play with the exception of running the 12V power wire from the battery back. My car had few places to run such a wire but it worked out. Overall it worked very well and I'm very pleased.
Initially I was hesistant to spend so much money on a plug and play unit when I can wire a standard wiring kit just fine, however, I’m glad I did buy this kit. The weather sealed plugs give me piece of mind that I won’t get corrosion in the connections down the road.
I would buy again!!
Great product. Install on my Subaru Impreza wasn't too bad once I drilled a hole and fished the hot lead through the firewall. Instructions were easy to follow, and I was happy that the converter came with an adhesive pad to hide it away behind the bumper without rattling around.
I’ve installed 3 of these and all 3 fail within 2 months, even tried installing the control box inside the car( you are supposed to stick it outside under the back) and it still failed. It may just be not compatible with a 2012 Subaru Impreza, I finally gave up and rigged up a diy battery operated switch system because we do not camp often it works good enough.
This harness was near perfect, the hardest thing was cleaning a spot for the control module to mount to. It's been a while since I installed this so the details are fuzzy but I don't recall any difficulties.
When I connected to my trailer everything worked, after I fixed a bad ground.
I like that I didn't have to hack into any wires with this system. It's almost completely plug and play. The only difficult part was running the power wire from the unit up to the battery. Crawling under my Impreza was really tight and I wasn't sure if the wire was near anything that would destroy it. So, i epoxied 4 metal hoops/rings (had them in my toolbox but you could get metal tubing at a hardware store and cut four short rings) along the frame rail underneath on the drivers side and ran the power wire through them. I still had to finagle the wire up and through the rear axle/exhaust area though.
Looks like a good product however it was not what I needed. I mistakenly ordered trailer wiring instead of tow car wiring. It should have been obvious to etrailer that I was making a common mistake and questioned my purchase since I was also buying parts to tow that car instead of towing something with it. Now I have to eat the purchase and buy another correct part.
Great product, very easy to install. Installed on my 08’ Impreza outback sport. It is a true “plug and play” install, no wires to cut, just route the wiring harness and hook up the connections.
Good kit and glad to have to get my trailer lights hooked up. Fitted my 09 Impreza great. Only 1 thing the sticky pad that attaches the relay box attached to the under said of the bumper well but it would not stay attached to the relay box. So the relay box kept falling off. So I ended up just wrapping it with electrical tape to the backside off my hitch and that works fine.
This wiring harness works great. Installation videos from E trailer were very helpful. The instructions that came with the harness were not for my exact model. E trailer products and shipping were amazing as usual.
Purchased the Curt T Connector about a month ago. Was asked to review the product. So here goes. I didn't get a chance to install it until today. First let me say I am an avid DIYer. I build or fix everything. So this was really a sweet product. I would rate it as anyone with simple hand tools can do a great job. First it was straight forward and installed just like it said. No issues at all. It took a bit longer than suggested as I need to run the power line and secure it to the unibody of the Subaru. Works great looks good as you can not tell it is there. The only real complaint is the electrical connectors, they are really cheap as I broke the first 2 I tried to crimp. So I just soldered the connections and used a blister wrap to protect the wires.
Great kit. Plug and play. Very straight forward. Running the power cable to the battery is tricky, but that's no fault of the kit.
Our mechanic, who installed the products we purchased on eTrailer, reported that the hitch was good quality, but somewhat tricky to install on our Subaru Impreza. They had to drill custom holes in the car body to fit the hitch frame. They also needed to run the wires from the car battery up front through the interior of the car (through panels and the trunk) to reach the wiring harness for the hitch. The full installation will end up costing around $250 in addition to the $*** for parts. I was impressed with eTrailer's customer service with a single rep assigned to each customer!
I bought the etrailer kit for a 2011 Impreza. The installation was a snap and after a year, it has never failed, the connector housing and weather cover have remained in good condition. I saved a lot by doing it myself, following the included, well written instructions.
I am coming back for any future wiring needs.
About 6 months after I installed this unit I started getting weird lighting issues with my car. I went out one morning and found my turn signal on without my keys even being in the ignition or the signal switch on. Then my brake lights stopped working and I was almost rear ended multiple times before I realized they were out. As soon as I remained the trailer wiring all my lighting problems were solved. The module must have not been to weather proof and failed causing my issues.
It made it easy to hook up an Impreza harness, since Subaru did NOT provide an easy-plug harness (like they do on Foresters, etc). We had a minor problem due to our poor ground, but redrilled a hole and cleaned up the paint, and it worked w/a better ground.
Awesome love the products my Subaru loves pulling my camper to New Hampshire and and getting hay weekly and yes my 2011 Subaru wrx pulls hard
Works perfect with my Subaru Impreza hatchback. I had my mechanic print the rear electrical wiring diagram for my car. I tapped into the 15 amp power supply at the trunk light instead of running under the car to the battery to get power.
I also picked up the hitch mounting bracket for the wiring:
It looks nice and clean and is always ready to tow my landscaping trailer.

Heather A.
3/12/2018
Dane,Thank you for your review.It is important to run the power wire directly to the positive side of the battery and not any other power supply on the vehicle. This wiring harness is made for vehicles that have sensitive wiring and is designed to pull amperage directly from the battery. Failure to connect the power wire to the battery may result in damage to the vehicle wiring. I have attached a link to help with routing the power wire.
Helpful Links
Fantastic kit! Just like the video shows, this is a very easy install. The only pain was running the line up to the battery and avoiding any moving or hot parts.
Install took a little over an hour, with most of the time running the wire to the battery.
I installed to our 2010 Impreza wagon.
I did use electrical tape to loom up the wires (the black looks less noticable) and zip tied the wire along the hitch. Be sure you keep the wires away from the muffler which will get hot.
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Kevin K.
7/30/2015
Works perfectly after one year! We use it almost weekly.