T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

by: Anthony08/31/2022

This harness installed fine; my complaints go toward the Mazda engineers. However, since it was my first time, it took me nearly 10 hours to run the ONE power wire from the back, under the car, over the rear subframe, through the aero panels, up the brake line (staying away from the exhaust), around the battery, and then secured to the batter using lots of wire loom and zip/nylon ties (more than what was in the package). The wire follies were not the kit's fault. It might have taken less time is I went under the carpet (on the inside), but I won't know unless I do another one. So far, so good. Sorry, pics are all on my phone.1386541

Anthony

9/1/2023

after a year, the harness and power wire are doing fine. for less hassle, I need to to run the connector through the grommet on the drivers side and out of the car. I hate smashing the wire with the tailgate each time I tow its only been three times, but hated smashing the wires on each one. a bit of extra sealant on the grommet and we are good to go...now just need to find the time.

Relatively easy to install. All adapters fit perfectly. Very happy. 250906

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Aidan

5/20/2017

Perfect. No problems. No rust.

I usually don't have time to write a review. but because I really like how easy was the installation and the wiring instruction that you guys posted in your website. I am writing now to appreciate the business we done. the Hitch design and material well done.I received the items on time. the job took 2 hours for both hitch and wiring.
you deserve 5 stars.792620

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by: Zenon04/06/2023

I am very happy with this purchase. The harness was easy to install. Works very well. I feel confident taking the trailer on the road. Thank you for very good, very friendly customer support.1551364

Received the Draw-Tite 75217 trailer hitch for my 2016 Mazda CX-5 sooner than expected, along with the 118563 wiring harness, all in excellent condition. I chose the 2" class III Draw-Tite hitch over the class II, 1-1/4" hitch offered by Mazda at 3 times the cost. Pretty easy install after viewing the installation videos on etrailer.com. One really nice feature was it came with 4 bolt wire guides instead of the 2 that other reviews commented on, nice to see they take customer feedback seriously !!

I plan to use it to pull a small trailer I own, a small U-haul trailer and for a bike rack (without needing a stabilizing strap). 331647

Oldwinger

1/10/2018

After a year of intermittent towing, I still love the hitch and wiring harness, no problems with either.

I haven't installed it yet, but like the hitch this seems like a quality product with everything included.

I watched the video and again, like the hitch, it was for my vehicle and was step by step. The toughest part is all of the interior molding that needs to be removed and that is not tough.

I really like how connectors are used instead of using side taps or splices.

I'm not too wild about snaking a power wire up to the battery, but that is only because I have to do it on my back since I don't have a lift. I'll get over it.

It would have been nice if I knew I needed to buy the attachments for the the connector separately. It probably said on the site and I just missed it. I will need to order the two attaching plates before I start to install.

From the looks of it, this will not be hard to install. It seems like a quality product. And, I would recommend it at this point. I don't think I will change my mind after installing.1467698

Absolutely the best product I could have asked for. I watched the video on your site and installed my trailer wiring harness in less than an hour. The support that etrailer gives is unmatched . It is exactly what I was looking for, no vehicle wire needed cutting ,no soldering just plug in the supplied harness and run the vehicle power supply. You even showed where the most convenient place to get power was and everything worked perfectly the first shot. Great job etrailer!405071

Bcnemo

7/15/2018

Works just fine!

Delivered on time and easy installation. Minimal wiring work was needed, anyone who can crimp 4 connectors and run a wire can install this harness. I would recommend following the installation video, it is much more detailed and gives better recommendations on how to properly run the power cable from the battery while avoiding the power train heat shields.

PS: Dont forget to get a Zinc plated M6 nut to connect to the battery (part # 185916) I had to run to the local big box store to get one.210145

Ben W.

7/9/2016

One year later and the wiring kit is working great. I am not crazy about how the wiring harness just hangs out the back of the trunk, as the trunk has taken a few chunks out of the wire while closing. Overall though great product and would buy again.

As a retired (42 years in field operations & maintenance) electronics tech, I have designed and built a lot of wiring harnesses. This looks like a pretty good wiring kit. It is complete with a minimum of wire splicing required. Quality of parts and workmanship looks good. Installation instructions are clear and useful.1467652

Install was simple enough, but not 100% accurate. Box claims everything needed and mentions cutting and no splicing then the instructions have 2 splices, one is just into a butt connector but the other is cutting and spicing without provided hardware. Instructions also say to use the included zip ties which aren’t included, none of that is a big deal and you probably already have, but just incase…. After those minor descrepancies the kit works great!1473267

Curt Trailer Hitch & T-One Wiring Harness:
Great products, Great price. Etrailers you tube videos' make installation easy. No surprises.

668453

John W.

7/11/2020

Product has been great. No problems at all

by: Bobby 01/24/2023

Good instructions. Easy to install. Quality product.1506833

by: JeffB11/13/2016

2016 Mazda CX-5

Installed a receiver hitch on a leased Mazda CX-5 and wanted the option to take it back off if at the end of the lease. The wiring harness installation was a breeze with this kit. Running the long power feed to the battery took a while but I'll be able to remove the whole unit easily, if needed. The product has been working as expected and doing business with eTrailer is painless. Their online resources and support team have been very helpful with this project.316201

by: Russ N. 09/05/2019

I appreciate that etrailer provides incredible information to help choose the most compatible parts and accessories for my vehicles and purpose. I needed a sturdy receiver hitch and wanted one that showed the minimal appearance distraction. Once I got the hitch, the video instructions for installing the hitch saved me from a good deal of wasted time sorting out what order to take the exhaust down, install hitch and route wiring and restore exhaust. All in all, I saved a substantial amount of money doing it myself and never felt frustrated by lack of specific experience. Stress-free experience. 697976

Great products and fast delivery. I installed on a 2015 CX5. Getting exhaust removed from 4 rubber hangers was fun (soap does help). Next challenge was fitting the hitch between the exhaust and car frame by yourself. I ended up grabbing a bunch of scrap lumber and propped the hitch up. It is quite heavy and awkward working in your garage (not up on a lift like the pro's). I had problems clearing the rubber bumper but after lots of adjustments and getting the hitch supported with wood I got it. Wires that hold the bolts work great. Wiring package instructions were okay once I understood what they meant. Took a little to digest without pictures. All in all, went well, certainly not 20 minutes, more like 1 hour or more for hitch, and 1-2 hours for wiring - removing panels and feeding wire to battery took some time. I did crack 2 pieces of my trim popping the plastic parts up with a screw driver and fingers. Did not help it was very cold over Christmas time when I did this. Towed my pop up trailer 1000 miles without an issue. So can't complain!464769

by: Brad A.08/04/2019

I received the trailer hitch and associated products on time and installed them according to the very helpful instructional video. I have used the trailer many times and have never had a problem. The old trailer itself had a short in the lights that blew out the fuse. When repaired, the fuse was easy to replace because it was so accessible.680553

Very simple tie in with the tail lights using the mating connectors. I routed the trailer pigtail through the grommet so it would be outside the car. The run up to the battery was a good exercise for the wife who spent a few hours under the car. I don't know why they didn't include the nut for the battery tie in or use the correct size terminal lug but the right size parts were available at my local hardware store. All in all a very good product.198382

I purchased a Curt trailer hitch and T-One harness for my 2014 Mazda cx-5. I was anxious about buying the direct battery powered harness because of the extra hassle of running the hot wire to the battery. However, that part of the installation wasn't bad. I was able to easily slip the wire under the plastic trim inside the car and cut a small nipple on the rubber boot protecting the wires on motor side of the fire wall and pull the wire through that hole into the motor area. I used a 14 gauge house wire that I duct taped end to end with the flexible power wire. The hard house wire was easy to push through the hole in the boot and work through an existing, big opening in the interior. The end to end taping allowed me to pull the black power wire through the small hole into the motor area. The wire is very tight in the hole so there should be no water leak into the car. I also put a dab of silicone caulk on it since I am a belt and suspenders kind of guy.
The hitch was a great fit and the wire bolt holders were great. Getting the rubber isolators off and on was a much bigger deal than in the video, but, with persistance not too bad. I torqued the bolts as recommended which was about 0.5 to 1 turn more than my hand tight set. Glad I used the torque wrench. 221016

by: Shane12/15/2017

2015 Mazda CX-5

I bought a hitch and plug-n-play wiring for our 2015 Mazda CX-5. Everything worked as expected and I installed it myself. Your online video instructions help tremendously giving your customers the confidence they need to make their own installations.
Thanks for a great purchase!
Shane 460418

Product works as advertised, easily connects into existing wiring. However this is not an easy installation, made harder by the way they're constructing cars these days. Removal of inside left panel of Mazda CX5 is not easy . The running of the lead to the battery takes up a good part of a day, due to the fact that Mazda has three covers under the car that must be removed to run wire. 241859

Very easy install video to follow. Made installation quite easy. I had to jack up the front end to crawl underneath and lead the power wire under the car and up to the battery. MAKE SURE when you feed the power wire up into the engine bay it’s on the outside of all the heat shields. There’s two of them and it can be a bit tricky to get it outside the second one without taking off trim pieces under the car. It can be done with one person but it helps to have a second. One person feeding the wire lead from top and the other underneath guiding it. I also had to remove a few bolts holding the plastic rain rail on to feed the power wire begind it. Overall very good product and easy to install.498954

Easy installation . Reviewing the videos helped guided how to remove the proper panels of the vehicle. I choose to guide the power wire inside the car by removing the left side door sills, and zip tied it to the existing wire harness. Then I followed along the wire harness through the firewall where the rubber grommet is.Then to the battery.420271

Had my mechanic put the hitch on and wire the car. He had no trouble at all, everything fit as described. Great instructions and video! I have yet to actually pull a trailer but expect it to be the clear deal! Thank you, Neil R. 108541

Took a little longer than I expected because I didn't want to run the wire to the battery along the frame figuring it would eventually rub through and short out, so I ran it inside under the door sill trim plates on the drivers side and had to drill a small hole in the firewall with a rubber grommet under the dash to get it to the engine compartment. Green wires to the passenger side could have been a bit longer due to where I had to mount the control box. Works fine672792

by: Bryant02/02/2018

Excellent product, plug and play simplicity.

Watch the installation video first, it's excellent and will save you from accidentally damaging trim pieces or connectors upon disassembly.472219