T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
This item does not fit your vehicle
2016 Jeep Compass
These items fit your vehicle
2016 Jeep Compass
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.
Tired of dealing with complicated wiring setups? The custom-fit T-One connector plugs directly into your vehicle's existing wiring harness without cutting or splicing any wires. It's cleverly located behind your vehicle's driver-side interior trim panel, making the installation process straightforward and clean. Whether you're on your first or third installation, you'll find the process quick and intuitive.
Worried about overloading your vehicle's electrical system? The built-in ModuLite power module is a game-changer. By directly connecting to your car's battery, it reduces the strain on your vehicle's wiring while effectively combining brake and turn signal functions to ensure compatibility with a two-wire trailer system. You get reliable power without compromising your vehicle's intricate electrical setup.
Protect your connections from weather-induced wear and tear with the robust 16-gauge bonded wire and an included dust cap for the 4-way flat connector. These components ensure that the trailer's signal lights remain functional in various conditions, minimizing maintenance concerns.
Need flexibility in your towing setup? This harness provides a 4-way flat trailer connector compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately). This adaptability ensures you can connect various types of trailers without needing additional hardware changes, making it versatile for any towing needs.
Tekonsha emphasizes reliability with a dedicated ground wire separate from your vehicle's factory harness. This feature enhances the grounding process, leading to improved performance and minimized interference during operation, especially beneficial for vehicles like the Acura RDX.
Handle your trailer's basic electrical needs efficiently with the harness’s maximum amperage support of 7.5 amps per circuit. This robust support ensures your trailer’s signal lights work with all the reliability you've come to expect from Tekonsha, whether you're heading cross-country or just down to the local campsite.
This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side interior trim panel in your rear cargo area. Once you've plugged in the tow harness, locate the fuse box under your vehicle's hood and insert the provided 20-amp fuse as indicated in the instructions.
Once installation is complete, the 4-way flat connector will be stowed in an out of the way location in your cargo area.
It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.
A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights.
This will not affect how the tail lights on your vehicle operate.
With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.
California residents: click here
The quality of this wiring harness is excellent and the installation instructions were straightforward and easy to follow. The 4-pin trailer wire was too short, though, to reach the hitch when I ran it underneath my vehicle. So I had to order an extension cable. No big deal but the manufacturer could greatly improve this wiring harness kit by adding another 3 feet to the length of the trailer wire.
2014 RDX w/Tech
I was a bit intimidated when I open this product up. I read the instructions and went for it.
The pre-wired trailer wiring plug was the only thing I had problems finding. The picture provided in the instructions didn't exactly match what I was seeing on my car.
Turns out it was just hidden, through the access hole look or feel forward towards the front of the car. (picture attached) The actual plugging is done by feel, one can't see it and plug it at the same time.
After that, all is good...
Keith G.
12/26/2014
After a year, no issues with the wiring kit what-so-ever.Works perfectly.
Delivered in a couple days and fit perfectly. Also install videos very helpful.
The wiring harness arrived on time. Everything required for the install was included in the box. I was able to secure the ground wire to an existing mounting screw so no need to drill an additional hole. Harness was easy to install. Only takes about 10 minutes. Instructions were very helpful.
Mctamster
6/23/2025
Great.
Kate F.
6/24/2025
Excellent product...no issues and use to have trailer lights for a u-haul rental. Etrailer offers great customer service and pricing; no complaints!
Easy to install. Appears to be made of quality materials. Instructions and installation videos are easy to follow and understand. Shipping cost were reasonable and product arrived quickly.
Installed and working properly. Videos made the process very easy.
Amazing customer service and order communication. I will definitely order from etrailer for my needs in the future.
I bought one of these to replace a faulty unit. I had two units from a competitive brand that both failed in the same way. This unit has proven to be reliable.
The product arrived by UPS very quickly. The packaging was damaged however the product inside had been packed well enough that it was not damaged. Two items were ordered; a Draw-Tite trailer hitch and a T-One wiring harness. The online video was very helpful in describing the installation process for the hitch. I was able to install the hitch by myself in less than a hour. The wiring harness was a little more difficult since Acura doesn't provide much space in which to work and the factory trailer wiring connector is on a very short line. It was also difficult to get the trailer lead routed under the deck panels and into the spare wheel well. But I succeeded. Overall I am very pleased with the results.
Robert C.
5/23/2014
After a year of use I am still pleased with the installation. The harness tucks safely under the rear storage cover in the RDX. No issues have occurred with use. This is a great product.
Everything was shipped together and neatly organized in the box. Instructions were amazing and even tailored to my vehicle with photos. I did find that their videos on website were very helpful as well. I was a bit uneasy about installing a trailer hitch by myself but it was WAY easier than I anticipated. Excellent craftsmanship and saved a bunch of money over U-Haul and priced each item separately on Amazon and etrailer was about $[XX] less and arrived on the same day Amazon had quoted. Very pleased with this purchase and will use them again.
Got the product promptly and installed hitch and harness in 30 minutes! For the harness - Just pull the speaker panel behind the left rear seat (driver's side) and the harness was right there. Plug harness in, feed the plug under the spare tire liner, attached ground to taillight assembly (10mm bolt) and stick module to wheel well using two sided type. Done!
Roman
12/3/2014
Thank you,The 10mm bolt way to go.Have a safe
Again, a few paint chips but not a big deal. Quickly fixed with some fast drying paint. Installation was reasonably easy, but the space under the Acura RDX when working on the ground is not generous. Post-2012 Acura RDX need to have metal blocks (included) fitted between the chassis and hitch plates due the shaping of the chassis. Getting the holes aligned and bolts engaged while holding up the hitch was the trickiest part. Wiring per the video was simple but it would be helpful to have a video showing how the wiring can be permanently routed out to be mounted on the hitch (as is available for a Hyundai Tucson).
Heather A.
5/7/2018
AWB, thank you for your review. If you would like to route the 4 way wiring underneath the vehicle then you will have to find a grommet hole in the cargo area of the vehicle. If you do not have a grommet hole large enough you will need to drill your own hole using a hole saw, please check the underside of the vehicle is clear of obstructions. Once you route the wire through the hole you want to make sure you use some type of grommet or sealant such as part # LT37467 to keep out moisture and fumes. I see you have the Draw-Tite hitch part # 75784. This hitch already has a mounting point for a bracket. You will need a 4-way bracket part # 18144 to attach to the existing bracket on your hitch.
Helpful Links
Love the product. I did have to buy a tap to make the thread for the car because it was oxidize. Just bought the M12 1.25 as the thread if the bolt and it worked. Unused a jack to assist me in picking up the draw type hitch.
The wiring harnesss was a breeze to install. Excellent product. Recommend
Excellent product overall. Flat 4 wire to the connector needs to be at least 6” longer to facilitate installation when routing through the tire well grommet to the hitch. Everything had to be positioned too critically to get it to reach the hitch. It worked but not easily as it should.
Installation was simple and exactly as per instructions. Feeding the hitch wire under the foam pad in the tire well was a bit challenging but doable.
James
1/30/2018
I only use the hitch very occasionally but both products are working well with absolutely no problems.
Easy to install. Took half an hour alone. Make sure you clean out the threads for the bolts it makes it much easier the wiring took minutes the connector was further back in the panel but wiring was plenty long enough take the time to look at the videos very well done.
This was my second purchase of a wiring kit for my RDX. The first was a Wxxxxx product that provided instructions NOT for my car. I found other product instructions on line for my car that made sense. Therefore I knew the W. product was wrong and I had to send it back. The T-One product plugged in exactly as instructed. Installation was actually easier that instructed. My only problem was that the right side lights of my trailer initially did not work. They did work with my other vehicle (2003 Buick Rendezvous). After checking the plug output, there was power at P(parking) , L & R signals. I attached a ground, the ran a jumper from P to P ... worked. Did same for L, then R. Each individually, and they all worked. So this told me that the power requirements were too much for all three at once. I cleaned up the ground connection at the non-functioning light (R) and confirmed it was good, plugged the connectors together, and it all worked as it should. Perfect! The reason it worked on the Buick is probably because the wiring is directly from the light wiring. The T-One isolates the trailer from the rest of the harness, thereby protecting the electrical systems. That sounds good to me.
Extremely easy to install. It took me about 10 minutes.
I worked perfectly for our RDX, with very little trouble when I installed it. Length of wiring harness was great and all things hooked up just right. Worked the first time with all trailer lights working.
Can the wiring harness be fed to the outside under he car to the hitch? Currently it is in the spare tire comparment area & I would have to close the hatch on the wire to connect to the outside trailer. That could cause a wiring failure. The wiring currently works great as is.
Purchased this product and the Curt Class III , 2” inch receiver hitch for a 2013 Acura RDX. Absolutely a perfect plug and play installation that took all of 10 minutes. The online video of this installation is better than the provided instructions. Extremely fast shipping! Received it in two days. Etrailer.com always seems to have exactly what I need and ships it very quickly. Pleasure doing business with them. Customer service is outstanding!
Install was easier than expected. Inserting the trailer plug was easiest when following the factory cable from the spare tire area back to the wheel well and pushing the trailer plug into the spare tire area. No need to remove any of the foam sound deadening material.
This wiring harness is complete and plugs in to the Acura RDX wiring harness for trailer wiring perfectly. The instructions are clear and thorough and installation was quick and easy.
I received this wiring harness very quickly from etrailer and had it installed in 20 minutes. Very pleased with this as well as the hitch I received prior to getting the wiring harness. Good instructions.
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
At etrailer.com 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.
Doug
8/18/2013
Thanks to Keiths comments, it was easy to find. I went back in with a flashlight and reached around and it. Again, thanks to Keith!!!