Arrives before Christmas To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
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Say goodbye to the hassle of cutting, splicing, or tapping your vehicle’s wiring. With the custom fit T-One connector, installation is as simple as plugging into existing wiring in your vehicle’s rear cargo area. Designed for ease, this system lets you quickly connect a 4-way trailer connector without the fuss.
Protect your vehicle’s wiring system while towing with the Powered ModuLite feature. This smart system reduces strain on your car’s electrical system by drawing power directly from the battery. It ensures that your trailer lights operate without overloading your car’s circuits, offering peace of mind on every journey.
Adaptability is key for reliable towing, and this wiring harness connects seamlessly to multiple trailer adapters, including 5-pole, 6-pole, and 7-pole systems (adapters sold separately). Whether you need various configurations for different trailers, this harness has you covered, ensuring a smooth connection each time.
Maintain a clean and operational connection out of the elements with the included dust cap for your 4-pole flat connector. It’s designed to safeguard against moisture and dirt, ensuring your trailer lights remain functional when you need them most.
Tekonsha is known for its reliability, and this harness is tailor-made for Mazda CX-5 models from 2017 to 2021. The high amperage rating—5 amps for stop/turn lights and 7.5 amps for tail lights—ensures robust performance, making this a trusted choice for your vehicle.
Prevent corrosion on your electrical connectors by following the handy tip of applying a small amount of grease. It’s a simple, effective measure to prolong the life of your connections, ensuring they remain in top condition for countless miles on the road.
This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your rear cargo area. You will have to remove some interior paneling to access this harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.
Once installation is complete, the 4-way flat connector will be stowed in your spare tire compartment.
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.
California residents: click here
Worked exactly as advertised and allowed me to do a cross country trip towing a trailer with my SUV, saving lots of money instead of renting a truck. Instructions were clear and the video was very helpful.
This was purchased for a 2018 Mazda CX 5. I did a review on the excellent hitch I purchased and spent more time talking about the wiring and how to remove the panels on the 2018. Can't use a hitch without wiring. Get yourself a cheap set of interior auto trim tools. Saved a lot of time popping out the trim connections. Push the trim back into place before you put the passenger seat latch in because it has a pop connection and is easy to do after the trim is in place. After removing all of the undercarriage covering, with plenty of bolts and pop up trim tabs, and taking forever to run the power cord up to the battery, I thought it would have been so much easier to run a hot lead from the power module over to the passenger side, along with the other wiring that has to go over there, and hook a cigarette lighter plug to it. When using the trailer, you pull out the trailer harness from the left side, and you can pull out the cigarette plug and plug it in on the passenger side for power. It is rated for 10 amps and the power module only 7.5 amps. I would have liked to have seen the trailer plug harness about 6 inches longer because it does not reach very far out of the car and I put the power module as close to the back of the car as I could. Plenty of wire holding straps and all the parts needed to do the job well. Everything needed to do the job well.
We've ordered several items from eTrailer including this wiring harness. It works great for our travel trailer and was fairly easy to install ourselves. Their customer services is excellent!
Product is great. Have had some issues with the wiring harness — the lights on the trailers sometimes stop working and it’s been diagnosed to the harness itself not the trailer wiring. Have to position it correctly for them to work.
Simple, I am no electrician and I was able to do it myself just fine.
Everything I needed was included. Installing the power cable was not so easy on the CX5 but this was not the fault of the Harness.
I haven’t installed it yet. But shipping packaging can be a bit stronger.
Ruky
4/25/2023
After a year of use I am glad to say this product has held up with no issues whatsoever. Highly recommend this product.
arrived fast. Box was damaged and wiring harness bag looked crushed and taped shut again? Install video was extremely helpful. Was able to install hitch an wiring without having to raise vehicle!
It took more time to take the car plastic apart than it did to hook up the trailer wiring. 1 year later, still works great!
Very easy to install and having the OEM plugs is risk-free.
items arrived as advertised shipping time, the how-to videos laid the groundwork for a smooth & easy install on my own, overall fast shipping, informative install videos, parts that are high quality and fit/installed just as videos suggest, would definitely purchase these products from here if needed again! Thanks
Everything was as expected and had no real issues getting it installed. I cheated a bit and instead of wiring the power lead to the battery i wired it to a power plug to plug into the power port in the rearmost storage compartment. The plan is to just keep it non powered with the cord stowed out of the way until I need to tow which is very infrequent.
great product . but it would be helpful if they had a video of taking interior panels off to get at wiring.
Fanatastic harness kit!
Once all the trim is removed it's a plug and play affair. The only difficulty is finding a 12v source for the module. I my case the CX5 has a 12v outlet in the trunk so it was easy to just tap into the positive wire.
The video is very helpful to connect and install the wiring.
I wish there was a better way to connect the positive wire at the battery.
Installed the wiring harness a year ago. Installation instructions were easy to follow and using the provided wire clips meant no splicing/cutting wires. Wires and connectors feel heavy duty, and of very good quality. So far so good!!
This has nothing to do with the product, since it is necessary for all of these types of wiring harnesses: If you decide to install yourself, note the hardest part for me was running the wire through the splash shields under the vehicle to the engine battery. It may be best to see how to find a power source through a factory installed power port close to the rear of the vehicle. (e.g. old cigarette lighter)
Michael G.
6/21/2021
It has been a year and product still works as designed. Note I only use a trailer approximately once per month.
I ordered a complete tow hitch set up for my 2020 Mazda. This is the 3rd hitch I have from them. They were all very easy to install and have preformed well. The wiring harnesses were very easy to install as well. This last order I got a bad harness and had a problem with a constant drain on the battery. They were very helpful in getting the information to me for a return of the bad part. Their customer service has been very good and I would recommend them to anyone for both good product and good service, as well as the best pricing I have found.
Maurice
7/1/2021
I just recently ordered another harness to replace the bad one and all is good. Not totally sure the first one was bad now because I got a recall on the auto for an issue that drained the battery. May have been the problem but when I unhooked the one I thought was bad the battery problem went away. Now the recall was done and a new harness is installed and no issues.
Shipping was very fast and the items were well packaged. The online video to help with installation was spot on and very helpful. Install on our Mazda CX-5 was easy with the included hardware kit. All and all took me about 45 mins to install the hitch. I did it all in my driveway with the help of my 2 sons and my wife.
Easy to install. Took a little longer because I changed my mind about routing and had to redo some things. No big deal though. Opted for the plug method for power with the port in the hatch space. Haven't had occasion to use it yet, but don't expect any issues.
Helpful customer service, fast easy shi pping
Install was not simple. Three guys and a lift. Had to put hitch on twice due too the fact we took off the muffler rubber holders. Can't get lower ones on with hitch in place. The electrical plug and play omg that was a joke. The entire left and right sides of back interior had to be removed to get to the "plug" and "play" connectors. I rate this as the most difficult hitch I've installed. I've done the BMW x1,x3 and Jeep Grand Cherokee hitch installs from your site...and they were seemless...awesome..but the mazada cx5 really sucked.
Jenny N.
2/15/2022
The installation of the harness is involved for this vehicle. I recommend taking a look at our installation video that we have on a 2019 Mazda CX-5. And also the FAQ that we have on routing the power wire to the battery.
Much simpler to install than the 2005 model. The use of M/F connectors for left and right taillight wiring interruption made the installation a breeze. Routing the power wire to the fuse box in the engine compartment was (and probably will ever be) the most difficult part. In one vehicle, I routed this wire inside the passenger compartment, passing through the firewall via an existing rubber grommet plug. In the CX-5, I followed the video showing how to route the wire outside of the passenger compartment via an existing rubber grommet plug and under the vehicle, but inside the Mazda shrouds. (Shroud routing was easiest, despite working under the vehicle.) In either case, Mazda provides a 10mm stub on the fuse block / battery connector. Buy a stainless 10mm nut and flat washer, separately, for this. All is good!
This applies to a wiring harness installed on a 2017 Mazda CX-5. The 2017 CX-5 was revised so that in order to change a rear light bulb, the lens is now removed from the vehicle instead of going through an access panel in the cargo area. Therefore there is no access panel in the cargo area as stated in the instructions or as shown in the video for the previous generation. The connection points for the trailer wiring harness however are still behind the cargo area trim panels and most of the trim panel must now be removed in order to access the connection points. The same steps must be followed as shown in the video for the pre 2017 model but the cargo trim panels must be more fully removed in order to access the connection points. There is a grounding point already present on the driver side along with a unused rubber grommet that can be used to route the power lead under the vehicle.
Installed easy except running the power line back to the battery. The 2019 Mazda cx-5 had the underside of the car completely covered in panels. So I ran the power line inside the car under the door sil and into the fuse compartment by the drivers foot rest. I then used a fuse tap (replaces 1 fuse with 2 fuses and with a wire coming off the 2nd fuse to connect to the converter box. It is very easy to run the wire this way. I made sure that the fuse I tapped into was one that was powered all the time and not one that only had power when the engine was on and also was at least the same amperage as the converter wanted.
I have just installed the hitch and don't need the wiring harness yet. It looks like it will be easy to install once I get all the panels out of the way, (that's the difficult part). The kit looks complete and it is very well made. With regards to the video, should be a piece of cake.
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Mark L.
2/8/2019
After one year and hundreds of miles pulling a small trailer, electrical hookup still works fine. I did run it out the bottom of the car and connected to the bumper for a more professional look.