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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Our Price: $28.19
Custom Fit Vehicle Wiring

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118720 - No Converter Tekonsha Trailer Hitch Wiring
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into OEM tow package harness - no cutting, splicing or tapping required. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118720 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (255)
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Tekonsha Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into OEM tow package harness - no cutting, splicing or tapping required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Designed for use with a factory tow package
    • Compatible with 5-pole, 6-pole, and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points in rear cargo area
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's factory tow package wiring harness, which is located behind the access cover at the center of your rear bumper.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

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.

118720 Tekonsha T-1 T-Connector - OE Replacement - 4-Way

Item # 118720

Installation Details 118720 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 118720

Average Customer Rating:  4.9 out of 5 stars   (255 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into OEM tow package harness - no cutting, splicing or tapping required.


Great service. I installed the trailer hitch and wiring in 45 minutes. It was a simple install. I'm in my 70's that shows anyone can do it


I put a new receiver on my wife's 2020 Cadillac AT5 primarily for a bike rack but I thought I should do the wiring harness also. it was simple to install and it worked without a problem. Glad I made the choice to add the harness with the receiver.


The hitch and wiring plug fit perfect was easy to install, very pleased with the product,


I like etrailer products and service but the last order had a damaged box and the electrical cord does not work. I think it was smashed by the hitch,

Etrailer Expert

Jenny N.


When it comes to the harness we do not want to you to take any chances. I will have our Customer Service team reach out.

2017 Cadillac XT5

Don’t buy your after market parts anywhere else. Everything that we buy from e trailer is as advertised and works great.



It still works and we use it often. After a year I still stand behind my review.


Very nice quality. Installation was a snap. Video very helpful. I chose to use a step bit to enlarge the hole. Took two seconds. This is my second hitch from George. Great prices, excellent shipping time. I chose to cut the bumper cover to reinstall. Looks more trimmed out and intentional.

2018 Cadillac XT5

The Curt hitch cost a bit more than the Draw Tite, but I am drawn to "made in USA", which Curt bragged about, and Draw Tite doesn't mention..(ie made in China).

If you look at the pictures of both hitches, you can see that the Curt hitch has a considerably larger cross member, which, I feel, can account for at least 1/2 the difference in cost.

I was sold on etrailer because of their excellent video on you tube. The installation went without a 'hitch' (ouch!). The video was very accurate and explains everything extremely well. The only difference for me was that I did not have to enlarge the 'fishing' holes; mine is a 2018 XT5, and the holes were plenty large for the bolts and doublers. I also installed the Tekonsha 118720 wiring harness, which amounts to simply 'unplugging a dust cap, then plugging in the harness' - there is absolutely no reason for this to take more than 2 minutes....(it took me 5).

As many have noted, the hitch is pretty heavy (I'm guessing 40 to 50 lbs). The weight is not such a problem, except that it is also pretty awkward. What worked very well for me was to not raise the car at all. Where the cross tube, and the receiver tube meet (middle of the hitch) is braced with a large, flat plate (safety chain eyelets) this wide plate is ideal to set on a floor jack, and the hitch balances very well. My wife 'manned' the jack, and I rolled around on a creeper guiding the hitch into place. The 'fishing' wires are long enough that they can be passed through the hitch's bolt holes while the jack is still low. Keeping the wires tight as the jack is raised guides the hitch right into position. I had to 'wiggle' the hitch a little as it passed in between the muffler and the bumper cover, then I was home free!

I didn't really time the procedure, but I would estimate about an hour, start to finish. Not bad for a "mid 60's, fat, out of shape, fella" & his 60(ish) wife!

My trailer lights use the round, 6 pin connector, so I made a bracket that bolts to the cross tube, and holds the 6 pin receptacle. I then cut the 4 pin fitting off the wiring harness, and connected the wires to the receptacle.

Also, I didn't care for the idea of having to keep up with a 7mm nut driver, so I decided to install "Southco 1/4 turn wing fasteners".

Those last two projects took almost a whole day (including nap time!)

I attached pictures of the finished project. Probably doesn't show much..I didn't take pictures as I went.....& I'm not going back!


good fit E.Z. to install. ETRAILER always the way to go. THANKS

2022 GMC Acadia

Harness looks to be made of good quality wiring that will hold up for years to come. Super easy installation of just plugging it into the vehicles existing wiring without splicing any wires makes this harness a great choice. I installed it in minutes during my hitch installation on the vehicle so it made it a little simpler as the rear bumper cover was already removed.


Great company. I submitted an email about which items I needed to purchse for my vehicle. I got a prompt and complete response to my inquiry. The follwing day,while placing my order I had an issue. So, I replied to the original email request for clarification. While waiting for I response I seen the customer service phone number so I called and got an immediate answer to my issue. After the phone call I placed my order. The next day I received a reponse to my email with an apology for not getting back to me due to him being off for the holiday. Then after the items are delivered I get another email letting me know that the items have been delivered not from the delivery company but the purchasing company. This company helped me and kept in contact with me, every step of the way.
Thank you for doing business right.

2017 GMC Acadia

I am so excited and amazed at this product. The dealership wanted to charge me $462.34 to order it, and $429.00 to install it. $891.39, and that doesn't include tax and fees. I must say YouTube is my very best friend as I install the hitch and harness in less than an hour on my 2017 Acadia, and saved [About $750]. I will order all my needed items from Etrailer. The order can within four days. Thank you and if I could give 10 stars I would. CET Thomas, Aka Batman, Byron, GA


Everything arrived in a timely manner and well packed. The install videos made installation easy. Only took an hour or so. The wiring harness for the trailer lights was correct which made that super easy. Towed my boat the next day. I would definitely recommend


Well made everything you need to install with great instructions that make installation a ease

2018 GMC Acadia

easy easy, that's all i can say, video instructions were perfect, and it was a piece of cake to install!

Thanks so much!


Arrived quickly and super easy to insta ll


Plugged in with no issue. The product was damaged in shipping, however, they immediately replaced the damaged unit. Very good customer service.

2022 Cadillac XT5

Excellent quality connector plugs into factory harness and locks in place. Quality four wire pigtail and flat connector make for a nice wiring harness.

2022 Cadillac XT5

My hitch arrived a day sooner than original date. I installed by myself and fit and finish were perfect. I’m able to put the hitch cover in place and you can’t tell I have a hitch. Great hitch, exceptional quality, and easy to install.


This 4 pin connector was an exact fit for my 19 xt5. There are two plugs under the bumper that look similar. Once you remove the cap to the plug that this plugs into on your cars harness which isn't hard you plug in this 4pin into it. The length is great as well. It's literally plug and play. The 4 pin has a rubber boot that hooks onto the saftey chain anchor on your hitch and covers the 4pins when closed, this is probably the best feature. No more dragging it down the road accidentally.

2023 Chevrolet Blazer

Install was simple annd easy. Direct plug in ans stated. Installed on 2023 Blazer redline.

2018 GMC Acadia

Product arrived in three days. Perfect fit for my vehicle. Simple, plug-in installation, nor fishing of, or splicing of wires. I have used this company in the past with the same great products and services.

Robert B.


One year out and the product still performs. Easy to install! I was able to reach right in and complete the plug-in, without removing any body panels.


Instead of buying a new truck we bought a new SUV and purchased a receiver trailer hitch/Hiring for the SUV and a trailer to use instead of a truck, to pull the trailer that’s The best thing we ever did when we brought this product from A great product, cost-effective, easy instructions to follow and easy installation. A very well engineered product, I was designed exactly for Our new XT5 SUV . Easy to follow instructions I was actually easy to install. Highly recommend and I will use it again when my other new car arrives. A great company with cost-effective and great value automobile parts.. Keep up the good work and by the way great customer service [Thumbs up]

2018 GMC Acadia

The wiring harness I purchased for my 2018 GMC Acadia worked great. Was easy and quick to install. Saved me from having to wire in trailer power myself. Very straight forward. Just plug in and pull wiring to the hitch.


Everything works great, Great prices. Saved hundereds over dealer installed option. Easy installation.

2019 GMC Acadia

Excellent product.

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Can I Install A Wiring Harness On My 2020 Cadillac XT5 Without Having To Splice Wires
    Yes you can install a 4-way connector on the 2020 Cadillac XT5 without splicing wires with Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package part # 118720 which will plug directly into the OEM tow package wiring harness. The photos show where the wiring harness will plug into. I have attached an installation video for your reference on the 2017 Cadillac but the install will be the same for the 2020.
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  • Trailer Wiring Connector to Fit a 2018 GMC Acadia
    I recommend either of the Tekonsha wiring harnesses that fit your 2018 GMC Acadia. Tekonsha's wiring has been more reliable than any other brand that we carry. They're both easy to install. You locate connectors behind the rear bumper of the Acadia. The connectors are tucked up there pretty good but if you watch the video I attached you'll see where they are. Skip ahead to about the 1:00 mark to find the installer showing them. If you're going to install a 4-way trailer connector,...
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  • Will Installing a Trailer Wiring Harness On a 2017 Cadillac XT5 Void the Warranty
    Yes, there is a port on the back of your 2017 Cadillac XT5 that will be used for a trailer wiring harness. This port is located behind the lower bumper cover access panel which you can see in the attached photo. Once you find the plug I then recommend using the T-One Vehicle Wiring Harness part # 118720 in order to provide a 4-way trailer connector. The manufacturer of the T-One Vehicle Wiring Harness is Tekonsha who has the most reliable wiring harness on the market which is why this is...
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  • Trailer Wiring Recommendation for 2018 GMC Acadia
    For your 2018 GMC Acadia the best trailer wiring options are the Tekonsha kit part # 118720 for if you need a 4-way or part # 118276 for if you need a 7-way. These install very easily so I recommend them highly.
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  • Recommended Trailer Wiring Harness for 2018 GMC Acadia
    The wiring harness I recommend for your 2018 GMC Acadia that does not have the factory tow package is the T-One Vehicle Wiring Harness # 118720 because of how easy it is to install on your Acadia; you will only need to plug it into the connection behind your bumper. I have added a cut out of the linked instruction manual which shows where that connection point is. In addition to the easy installation of this harness I also really like it because it is manufactured by Tekonsha, who has...
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  • Removing Tow Plug Cap on 2019 Cadillac XT5 to Install Curt Wiring Harness C56325
    There isn't a trick to removing the cap on the tow plug of your 2019 Cadillac XT5 to install the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # C56325. I have added a link below to an installation video of this harness on an XT5, and at about the 2:30 mark you can see how our installer did it. What he did was slide the red tab away from the plug and up, and there will be a little gray tab to push down. I do highly recommend watching that...
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  • What Towing Parts are Needed To Tow Pop-up Trailer with 2022 Chevy Blazer?
    Sure can! For towing a pop up trailer you'll just need a few basic parts on your '22 Chevy Blazer: Trailer Hitch # 76023 Trailer Wiring # 118720 Ball Mount # 989900 I went ahead and included some install videos for these parts for you to check out as well.
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  • What Vehicle Does Draw-Tite Class III 76023 Hitch Fit
    The Draw-Tite Class III hitch you'd looked at, part # 76023 fits the 2017 - 2019 GMC Acadia, the 2020 - 2021 GMC Acadia AT4, and the 2019-2021 Chevy Blazer. The hitch will work perfectly on your Blazer. If you'll be towing with the hitch, you'll need a few other items to complete your towing system. You'll need a trailer wiring harness like # 118720 for a 4-pole connector or # 118276 for a 7-way trailer connector. You'll also need a # 2923 ball mount and # 19261 for a 1-7/8 or # 63845...
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  • Recommended Trailer Wiring Harness for 2017 Cadillac XT5 Without Tow Package
    The 2017 Cadillac XT5's should all come with a tow package port regardless of options so the trailer wiring harness installs are all plug-in play, there is no physical battery connection. I recommend the T-One Vehicle Wiring Harness part # 118720 for 4-way or part # 118276 for 7-way. These will both plug into a port under the rear bumper.
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  • Trailer Hitch Fit for 2021 GMC Acadia AT4
    The Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 76023 is a custom fit for the 2021 GMC Acadia AT4. You will need a ball mount kit, I recommend the etrailer Ball Mount Kit for 2" Hitches - 7,500 lbs # 989900. To power the trailer lights you will need a T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118720.
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  • Parts Needed to Tow a Trailer with 2018 GMC Acadia
    For your 2018 GMC Acadia we have everything you'd need to tow a trailer. For a hitch the Draw Tite part # 76023 that you referenced would be what I recommend as it fits behind the rear bumper cutout of your vehicle, has plenty of capacity and has a 2 inch opening. For trailer wiring you'd then want the # 118720 because it installs easily without requiring any splicing. Since you plan on doing some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball...
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  • Trailer Hitch and Wiring Harness for 2019 GMC Acadia
    The trailer hitch I strongly recommend for your 2019 GMC Acadia is the Curt # C13293 because it is a bolt-on installation that will not require drilling into your Acadia's frame to install, and is designed so that much of the hitch is not visible, as you can see in the accompanying photo. This Class III, 2" trailer hitch has a black powder coat finish which helps protect it from corrosion and also has a 5,000 lb towing capacity and 750 lb tongue weight capacity. The Curt # C13293 is made...
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  • Trailer Hitch and Wiring Kit Recommendation for 2020 Chevy Blazer
    The Curt trailer hitch part # C13418 is your best option for a trailer hitch for towing. This USA assembled hitch is very easy to install, has plenty of towing capacity and installs behind the rear bumper panel of your Blazer (see picture) so it's out of sight when you aren't using it. Then for trailer wiring we have the very easy to install 4-way kit part # 118720 which I recommend highly as well. I attached an install video for this kit and the hitch for you to check out as well.
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  • Can I Install A Wiring Harness On A 2019 Cadillac XT5 Without Having To Splice Wires
    Yes, I recommend the Tekonsha part # 118720 as an ideal solution for you. This Wiring Harness for your 2019 Cadillac XT5 provides a 4-way trailer connector and plugs into the exterior connector located up and to the driver's side of your 2019 Cadillac XT5. No splicing required. If you haven't yet purchase your hitch, I recommend the Curt Trailer Hitch Receiver # C13285 as a solid option for your towing needs and looks great on the back of the XT5 as you can see from the included customer...
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  • Trailer Wiring Harness for 2017 Cadillac XT5 Without Factory Towing Package
    From what I've been able to determine from my research, all of the 2017 Cadillac XT5 have the plug that is used to connect a trailer wiring harness, so the Tekonsha # 118720 should work for you. If for some reason the plug has been removed, you would need to hard-wire in a harness like the Curt # C58044, but this is extremely unlikely.
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    All models of the 2017 GMC Acadia, including the All Terrain variant of the SLE and SLT trim levels, are built on the GM C1XX platform which is new for 2017. Draw-Tite trailer hitch # 76023 is a fit for the new 2017 GMC Acadia, all styles, and I have linked a video showing an example installation for you. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or...
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  • After Installing Hitch on 2019 GMC Acadia, Can the Access Panel in the Fascia be Replaced?
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  • Will the Curt # C13418 Fit the RS Model of 2021 Chevy Blazer?
    Yes, the Curt Hitch - 2" # C13418 will fit a 2021 Chevy Blazer RS. If you need assistance with installing the hitch, I've attached a video to walk you through the process. If you need brake light/turn signal capability when transporting a trailer, I recommend the The T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118720. The 4-pole will plug right into your factory port under the rear bumper.
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  • Recommended Wiring Harness for 2019 GMC Acadia
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  • Recommended Trailer Hitch for 2019 Chevy Blazer with RS Trim Package
    I checked with Curt and as of Friday, they changed their fits and have confirmed that the Curt # C13418 hitch will work on the 2019 Chevy Blazer RS. The only Blazer model that this hitch won't work on (or at least hasn't been confirmed) is the Premier trim package. If you're going to be towing with your 2019 Blazer, you'll need a couple of additional parts. For wiring, you can use the T-One Vehicle Wiring Harness # 118720 which I've included an installation video for to help you with...
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  • Trailer Hitch Recommendation for 2019 Chevy Blazer
    I recommend the Draw Tite hitch part # 76023 for your 2019 Chevy Blazer because it allows you to reinstall the rear bumper cover over it when not in use (if present) to give you a totally concealed look and has great towing capacities as well. It also fits the RS and non-RS models as well. I attached an install video for this hitch on a similar Blazer as yours for you to check out as well. If you need trailer wiring and your trailer has a 4-way connector the harness you'd want is the part...
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  • Will the Curt Trailer Hitch for a 2022 Cadillac XT6 Fit a 2023
    The Curt Trailer Hitch Receiver part # C82WR which is a fit for a 2022 Cadillac XT6 will also fit a 2023 Cadillac XT6. This is a bolt-on trailer hitch that doesn't require any drilling or welding. It features a 2" opening which is great for towing or other hitch mounted accessories like bike racks and cargo carriers.
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  • Trailer Wiring Harness for a 2019 GMC Acadia Without the Factory Tow Package
    From the information I can find I believe your 2019 GMC Acadia will have the wiring routed back towards the rear of your vehicle whether you have the factory tow package or not (see attached photo). If you check up under the rear bumper of your Acadia you should find the wiring harness that you would plug the T-One # 118720 (for a 4-Way) or # 118276 (for a 7-Way) into. I have attached some installation videos on a 2017 Acadia as well as the written instructions for you to reference. I like...
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