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

by: Terry08/17/2019

Great hitch!! Relatively easy to install and at a great savings over what you would pay at the dealership. I just pull a utility trailer and don't need electric brakes. I bought the electrical kit that allowed me to connect to the factory wiring with no cutting/splicing. I saw a Youtube video in which a fellow used a floor jack with the hitch connected with Vicegrip pliers and used that example to install by myself. Completely satisfied with the Draw-Tite hitch and etrailer.com 690536

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Everything working fine, still completely satisfied with this purchase.

Terry C - 08/18/2020

First, completely bolt up hitch with no drilling required I have installed. I watched the installation video for my car and read the instructions. It was an easy job and looks nice. I also purchased the plug-and-play light wiring harness. It works well and was easy to install. 1296528

This converter box with wire and pigtail is exactly what I needed for my factory prepped 2012 Toyota Highlander. It did not come with these wires in it. After talking to the folks are etrailer; they squared me away and I got this installed and ready to tow my boat to go fishing. It even comes with the two fuses needed. He spiked mini one for the inline fuse holder as well as the low profile 10 amp fuse for under the hood. I did cut the love off of the pigtail fuse so it would fit into the hole in the compartment in the back by the tail light. I attached my converter box to an existing bolt under the dash against the firewall. It does not weigh that much so all is good. Did not even need to use zip ties just tucked up the firm wires above others and holds well. 1112253

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Very easy to install. Instructions for exact fit procedures were spot on. The only thing I did not like, there was no indication to trim the interior panel to keep from pinching the harness between the sill panel and the cargo storage container. 1272238

You mention in your review that you were unable to find a way to keep the wiring harness from pinching between the side panel and cargo container. I have a video linked below, if you go to the time stamp 3:09, our installer shows the best way to line the harness in the paneling in order to keep the wiring from smashing.

-- Katrina B - 03/22/2022

Tekonsha T-One Vehicle Wiring Harness Installation - 2019 Toyota Highlander - Video

by: Jerry04/01/2022

It was very easy to install. It only took 2 of us about an hour from start to finish. I liked how it was just plug in 2 electrical parts and 1 fuse to get the trailer lights working. The instructions were clear and easy to understand how to install everything. 1280655

Easy install and works great. As others have said, Needs longer trailer lead to allow for routing through existing holes. It's shorter length requires it to be routed directly out side of storage bin area to reach trailer, which means it's pinched between the edge of the storage bin and door frame trim. Probably not an issue if you don't have anything heavy sitting on storage bin while towing for long distances... otherwise it should be wrapped with tape at that spot or an extension should be added to allow it to be routed through existing holes. 1276184

by: Christopher04/08/2022

The products were as advertised, shipped and delivered promptly, and the directions were accurate and made the job easy to install. Etrailer.com is my go-to site for any hitch and trailer products! 1283455

The hitch was a perfect fit. I also put the drivers side panel back in place. All it requires is a notch in the panel to fit around the hitch mount. This makes the job complete like it should be. 1131526

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Installation went just like video. All mount holes lined up without any bending, twisting or [anything]. Trimming and re-installing (optional) the plastic filler pieces took the most time. Be sure to wear good covering safety glasses. It's amazing how much sand is up underneath. 1296299

by: Veaceslav03/17/2021

A super good product, very easy to install and connect. Perfectly fit my Toyota Highlander 2019. Have been using for a year, no issues at all. Highly recommended! 986081

No changes a year later! The harness has done fantastic job for two camping seasons. Not only carrying out towing functions, but charging my trailers battery as well. Still highly recommend!

Veaceslav - 03/17/2022

Installation could not have been easier. The video on the e-trailer website for installation in the Highlander was a great help. Even though the vehicle came with the factory tow-prep package that includes a wiring harness, the T-One harness or equivalent is still required. Go figure. As an earlier reviewer noted, with the third-row seat it is necessary to remove the driver-side flip-up third-row cover (the piece just ahead of the tool kit cover). Easy enough to do by simply laying down the rear seat and prying up the rear edge of the cover to loosen the clips. See the attached photos, the first with the cover in place, and the second with it removed. It is necessary to remove this cover to permit removal of the left-side tray to gain access to the existing harness and plug. One other piece of advice is to thoroughly clean the surface to which the box will be mounted to assure a strong bond with the included two-sided tape. I used alcohol-soaked gauze. The price through e-trailer was the best I could find anywhere, and the service was second-to-none! 19328

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This by far the easiest wiring harness I’ve ever installed! And a perfect fit. 1287350

by: Mark04/09/2022

Application: 2017 Toyota Highlander Good fit/finish, installed easily and does its job well. Would purchase from etrailer again. 1283765

The wiring on the 4 pin connection needs to be about 4" longer to make it a great kit but over all it is a good kit. 996964

It is still working as expected.

Andrew - 03/29/2022

Very very simple install! I ran the trailer wire through the rubber Grommet so that it would be on the exterior underneath the vehicle. Then used some zip ties to secure to lower valance on the vehicle gives it a finished look. 1048376

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Another great product from etrailer! It took me about 20 minutes to install it and it worked perfectly. The online videos showing the installation are fantastic. I can’t imagine shopping anywhere else for this type product. 1274833

by: Ronald07/24/2021

Good value, easy to understand installation instructions, I installed this by myself. Works well for me. 1103512

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Great product. Easy to install (2011 Highlander SE). Fit perfectly. I ran my wiring thru the rubber grommet under the left tray and then under the chassis as described in another customer's review (my pic is prior to sealing the cut with silicone). The product's instruction sheet was good but pics a bit hard to see clearly. etrailer.com's videos really helped. Disclaimer: the wire routing described is not spec'd by the mfr. in the instructions. It's only an option for you if you choose. 21877

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Installed on a 2011 Toyota Highlander Base Model Although the instructions missed some parts on my 3rd row seating model, they were very readable and the installation went quickly. I'll only point out a few things I saw that strayed from the written word, and something that I "modified" for your consideration. I hope this is not considered something that would affect safety/warranty. Under the dash, the converter box has sticky tape. I couldn't find anything that this would stick to (it just came off once stuck), so I just zip tied it in place. In the back, there are no instructions on how to remove the "folding cover" for the third row seat. I ended up just pulling it out, which probably wasn't the best. I got lucky, and none of the blind fasteners broke off. Once this folding cover is removed, there's a sticky "tab" that goes over the box over the trailer lighting connector. It's straight forward enough, but not explicitly mentioned. I did not like the idea of the 4 way flat sticking out the back door. Maybe it would be okay for occasional use, but I'd rather have it under the vehicle. Plus, I use a lighted hitch cover that would not work well if the wire went out the door. Under the tray that is removed to access the trailer connector, there is a large drain/access plug in the steel floor. I removed this plug, then used a sharp utility knife to X out the center of the rubber plug. I only cut enough out to allow the vehicle connector (not the trailer connector, which is larger) to be pushed through; up from the bottom. I replaced the plug in the vehicle, then routed the wires along a factory harness to the connector. I filled the rubber plug with silicone to stop water and fumes from entering the cabin, then replaced all the interior bins and covers. Under the car, the wiring set is just long enough to reach the hitch. Here I have it plugged into a lighted hitch cover. I keep a 4 foot 4 way flat extension in the vehicle with the draw bar for when I'm towing. Overall, I'm very satisfied with etrailer.com and their products. Not everything goes to plan, but the products themselves are very good. The price of this DIY job was 1/3 of the cost that the dealer wanted, and I know it was done right. I will buy from them again. (In the pic, the hitch wiring lights up my hitch cover, which I didn't buy from etrailer.com, but had from a previous vehicle). 8703

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Your order-taking & ship-time was great Your packaging left a lot to be desired Box ends should be reinforced with fiberglass reinforcing tape; staples detach. The wire harness box was destroyed; don’t know if it’s all there. It’s being installed now. The harness box should have been taped shut and to the hitch; luckily it arrived with the hitch, again, not sure it’s all there. 1155045

Sorry about the shipping issue. I would not install a possibly broken wiring harness. Customer Service will be reaching out to you.

-- Sierra K - 09/28/2021

by: Allen05/18/2022

Toyota

No problem at all! A cinch to install in our Toyota Highlander! I'll be using this company again! 1299376

by: Chris B08/27/2020

An excellent product, from an excellent company. Installing this was a snap - the instructions were crystal clear, easy to follow, and worked perfectly. I honestly put off installing this wiring because I thought it would be a huge chore - I expected splicing, taping, drilling, and a lot of cursing. I was completely wrong - it was basically just plug and go. Everything fit exactly, and worked perfectly. It couldn't have been easier. 869728

Update: one year later, and Im still completely satisfied with the product. No issues at all - still works perfectly.

Chris B - 08/29/2021

by: Bernie C11/03/2021

Chevrolet Venture

Still working great with my Boat trailer and the short pigtail has not been a problem, even while maneuvering in some tight boat launching ramp sites. Excellent how-to directions and could not have been easier to install. The 4-pole flat connector pigtail is not too long so keep that in mind as you proceed with installing connectors and routing wires. Works perfectly with my Venture twin axle boat trailer. 1194427

This is the third time I have purchased a trailer hitch from etrailer in the last 8 years. Great experience each time! Very good instructions included. Plus excellent videos on YouTube! Almost forgot, the plug in light wiring kits are simple to install and work great! 936421

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Everything was installed as instructed, and we didn't run into any surprises, although the video and other illustrations will instruct you to hang the plug out the back door, i dint like that cheesy look so i ran the wire through a drain grommet that is already in the floor on the left side and mounted the 4 prong flat connector to a Mounting Bracket that i attached close to the receiver area for a cleaner more professional look (note the pics was taken prior to the bracket installation) i will update pics later, Item # 18144, 760623

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