bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 Round - Blade
  6. No Converter
T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector

T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector

Our Price: $35.06
You Save: 32%
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 1.08 lbs
Add to cart
Custom Fit Vehicle Wiring 118276 - 7 Round - Blade - Tekonsha
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

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.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom wiring harness. T-One connector plugs into OEM tow package wiring harness - no cutting, splicing or tapping required. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118276 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 - 7-Way Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (66)
  • Q & A (0)
  • Photos

Tekonsha Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Round - Blade
  • No Converter
  • Tekonsha

Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom wiring harness. T-One connector plugs into OEM tow package wiring harness - no cutting, splicing or tapping required.


  • Provides a 7-way, blade-style 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 4-pole, 5-pole, and 6-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point behind rear bumper
    • 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 7-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 7-pole connector itself - to help prevent corrosion.

118276 Tekonsha T-1 T-Connector - OE Replacement - 7-Way

Item # 118276

Installation Details 118276 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 - 7-Way Trailer Connector - 118276

Average Customer Rating:  4.8 out of 5 stars   (66 Customer Reviews)

Quickly and easily install a 7-way, RV-style trailer connector on your vehicle with this custom wiring harness. T-One connector plugs into OEM tow package wiring harness - no cutting, splicing or tapping required.


All the wiring was already in the vehicle. They first sold me the wrong harness. After inspection I called and returned it for full credit and received the correct one and installed it. Its works great and the dealer had no idea how to wire the car.



Works great! dealer contractor wanted $850 to install a brake controller. E-trailer around $350


Great product and informative people. Product reviews and installation videos were very helpful.The included installation instructions were very basic and could have been a bit more detailed but if you watch the videos, it all makes sense and it makes for a an easy installation.


I was the installer in this vehicle application. I can tell you apon doing so the instillation was straight forward. My friends vehicle and to this day he continues to pull his boat and trailer without issues. Great product and I am a retuning customer with several vehicle applications I have done. Thank you friend no worries.

2023 GMC Acadia

etrailer is my "go-to" source for anything related to towing, RVs or trailer building. Always fast shipping and great customer service.

2019 GMC Acadia

Built Well very easy to use, just plug and go.


Fast friendly service. Explained what I looking for and Justin layed out what I needed. Very reasonable pricing and shipping was updated regularly. Great customer service. I wouldn't hesitate to order again.


Plug and Play


Perfect fit for my 2018 Cadillac XT5 and easy to install

2018 Cadillac XT5

Everything was delivered quickly and quality was excellent


Order came quickly and was accurate. Very simple it install and the site was very user friendly.


Absolutely Perfect A true plug and play install


Everything arrived on time in great condition. Complete installation in less than 30 minutes!


Yes, the hitch and the wiring harness all worked out well. Needed a friend to install the hitch. Everything was included and bolted up with no problems. Wiring harness plugged in to factory wiring. Satisfied, would recommend to XT5 owners wanting to tow small to medium trailers. Thanks again, good product.

2017 arcadia Acadia

Work well for my 2017 Arcadia which is a newly designed model. I was not sure if this item would be an exact "plug in" for my application considering my vehicle did not come with a factory trailer package. etrailer did some checking with the manufacturer to verify it would be and easy plug in. It did plug in and worked perfectly.

2020 Cadillac XT5

It was Plug & Play, easy!!


etrailer has excellent customer service personnel, who are knowledgeable, very friendly and polite. They have timely communications about your order, shipment and delivery.

The quality of the products that I have purchased from them has always been very good.

The instruction videos are thorough and will safe you many installation problems. I just installed a hidden trailer hitch on my 2020 GMC Acadia Denali without problems by using the video as my guide.

2019 Cadillac XT5

Everything you said it was and it was a perfect fit!


Everything fit together perfectly. Make sure you order s mounting bracket for your connector. I forgot and wished I had at the time of ordering. Hardest part was removing the original dust covers off of car wiring harness.

2017 Cadillac XT5

Watch video on removal of dust covers one of them is real tricky on Cadillac ZT5. My on concern about the hitch is the 7 way plug is round and the bracket is oval so they don't work together. All in all nice setup!


This product was a perfect fit for my 2019 Acadia. The instructions and even video were spot on. I couldn't ask for a better experience. Etrailer has exceeded all my expectations as an online resource. I am a mechanic and business owner and I did not expect this kind of support with video instruction from an online retailer. I will continue to use and promote etrailer to all my friends, family, and customers.

Thanks etrailer for making my life easier.

2017 Cadillac XT5

Rather difficult to install. The "how to" video helped a lot. Had difficulty removing protective caps on wiring on vehicle.

Etrailer Expert

Mike L.


The linked install video shows the plugs being removed beginning at the 1:40 mark. If the dummy plug is hard to remove, it can be pried away gently with a small screwdriver.



No problems with it.


5 Min. Installation, Plug & Play Removing Cadillac's connector cover was tough!!

2018 GMC Acadia

These parts were a perfect fit for my 2018 GMC Acadia. Installation was easy with the install videos. Thanks!


Very easy to install just wasnt a fan of not being able to put the two bumper/facia mounts back on

2017 Cadillac XT5

Product arrived quickly and in good condition. All necessary parts were included. The directions and video on installation were accurate and made the process easy.

Show More Reviews

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

  • Do Fuses Need to Be Installed on 2018 GMC Acadia to Install 7-Way Kit # 118276
    When installing the T-One 7-Way kit part # 118276 on your 2018 GMC Acadia no additional fuses would need to be installed under the hood of the vehicle. It simply plugs in like the install video and instructions I attached below show and you're set.
    view full answer...
  • Blown Fuse on a 2020 GMC Acadia Causing Wiring Harness Malfunction
    It sounds like you are either missing a fuse or have blown it out. You are looking for fuse F11 in the rear compartment fuse box of your 2020 GMC Acadia. This would cause the reverse function to go out but not the other ones with the Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector item # 118276. I have linked a picture below that will help you find the fuse location. This fuse box is in your rear cargo area on the driver's side.
    view full answer...
    Image 1 for
  • 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,...
    view full answer...
  • 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.
    view full answer...
  • Rear Bumper Fascia Cover Trimming To Reinstall On a 2021 GMC Acadia With Draw-Tite Trailer Receiver
    The reinstall the rear cover on your 2021 GMC Acadia you will need to trim the cover for the Draw-Tite Max-Frame Trailer Hitch Receiver # 76023. A 3" x 1-1/2" section must be removed for the cover to mount, I have included a picture of this. Once trimmed you will be able to slide the cover back into the mounting tabs and secure it with the factory hardware. The T-One Vehicle Wiring Harness # 118276 is a 7-way blade plug and play wiring harness that I recommend installing with the receiver....
    view full answer...
    Image 1 for
  • 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...
    view full answer...
  • 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.
    view full answer...
  • Recommended 7-Way Wiring Harness for 2021 Chevrolet Blazer RS
    In order to get a 7-way connection on your vehicle you should be able to use the factory connector you are talking about which has the connections for your current 4-way and also a 7-way. I recommend the # 118276 Tekonsha T-One Vehicle Wiring Harness. This custom wiring harness will plug into the OEM wiring harness where your existing 4-way is plugged in right now. No additional modification should be needed for the 7-way connection to work properly. I recommend the Tekonsha over other...
    view full answer...
  • Do Fuses Need to Install When Adding 7-Way to 2017 GMC Acadia
    The 7-way wiring harness part # 118276 which is a fit for your 2017 GMC Acadia does not requre any fuses get installed. It simply plugs in like the install video and instructions I attached below show and you're set. This will work great with the Draw Tite hitch part # 76023 you mentioned as well. If you wanted to do some towing you might be interested in 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...
    view full answer...
  • Does 7-Way Wiring Harness Fit 2022 GMC Acadia Without Factory Tow Package?
    Yes, The Curt T-One Wiring Harness - 7 Way # 118276 will just plug into the back of your 2022 GMC Acadia and give you a working 7-way even though you do not have the factory tow package. There is not going to be any need to run any wires or do anything other than plug the connector in. I have added a link to the installation instructions as well as a link to a video install for you to check out of the # 118276. Additionally, I do recommend Dielectric Grease for Electrical Connectors #...
    view full answer...
  • Trailer HItch and Wiring Recommendation for 2018 GMC Acadia
    For your GMC Acadia the best hitch option we have is the Draw Tite part # 76023. The reason I recommend this hitch is that when not in use you can install the bumper cover on top of it and it would be totally hidden. Then for trailer wiring the T-One kit part # 118720 is the best option for if you need a 4-way or part # 118276 for if you need a 7-way. This is our best and most reliable brand of trailer wiring so we recommend it the highest. If you wanted to do some towing you might be...
    view full answer...
    Image 1 for
  • How to Remove Access Panel and Install a Brake Controller on a 2018 GMC Acadia
    Your 2018 GMC Acadia actually has blunt cut wires for you to splice in a brake controller like the Tekonsha Prodigy P3 # 90195. The last Acadia to use the Adapter # 3026-P that you referenced was the 2017 Limited which was the same as the 2016 model year. The 2017 New Body and newer have the blunt cut wires up under the dash. I took a look at the online version of the owner's manual for your 2018 Acadia and on page 278 it says that the blunt cut wires can be found above the parking brake...
    view full answer...
  • Recommended Trailer Hitch and Wiring for 2017 Cadillac XT5 Base Model
    Yes, the Curt Class III Hitch Receiver # C13285 is confirmed to fit your 2017 Cadillac XT5 base model. It will use existing holes in the vehicle's frame for a no-drill installation and features a towing capacity of 5,000 pounds. I have attached an installation video that you can also use for reference. For a trailer wiring harness I recommend going with the Tekonsha T-One # 118720 if you need a 4-Way connector or the Tekonsha # 118276 if you need a 7-Way. These are both custom harnesses...
    view full answer...
  • 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...
    view full answer...
  • Will 7-Way of etrailer 7-Way Upgrade Kit # e99011 Fit 7-Way of 2020 Chevy Blazer
    Yes, the 7-way of the etrailer 7-way upgrade kit part # e99011 will plug into the 7-way at the rear of your 2020 Chevy Blazer. If you didn't have a 7-way all you'd need is the part # 118276 and you'd be set.
    view full answer...
  • 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...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch Receiver And Wiring For A 2017 Cadillac XT5
    For your 2017 Cadillac XT5, I recommend the etrailer Trailer Hitch Receiver Class III - 2", # e62AR. This will give you a very strong trailer hitch with a 2 inch opening for a ball mount or accessories. To install, you will need to remove the rear fascia door that covers the hitch, but it can be reinstalled when not towing with two bolts. Access holes may need to be enlarged by drilling, filing, or rotary tool. This installation should be routine for a professional installer. Unfortunately,...
    view full answer...
  • Trailer Wiring Harness Recommendation for 4-Way/7-Way on 2022 GMC Acadia
    To add a 7-Way and 4-Way connector to your 2022 GMC Acadia I recommend the following parts: T-One Wiring Harness - # 118276 Hopkins Trailer Connector Socket - # HM40975 The T-One plugs into OEM connectors at the back of your vehicle and then the Hopkins will install on the US Car connection at the end of the T-One. If you're also planning to install the Draw-Tite Trailer Hitch # 76023 the Hopkins mounting bracket will install directly to that mounting bracket on the hitch. To complete...
    view full answer...
  • Recommended Hidden Hitch for a 2023 GMC Acadia AT4
    Yes, there is a hitch for your 2023 GMC Acadia AT4 that mounts behind your rear bumper. It is the Draw-Tite Max-Frame Trailer Hitch Receiver item # 76023.This hitch is custom fit and bolts to your GMC with included hardware. I really like the Draw-Tite hitch because it installs behind your rear bumper cover and can be completely hidden when you are not towing. The Draw-Tite Max-Frame Trailer Hitch Receiver item # 76023 is a class III hitch with a 2" receiver and weighs 32 lbs. It has...
    view full answer...
    Image 1 for Image 2 for
  • Is There a 7-Way Connector That Will Fit a 2022 GMC Acadia Without The Factory Tow Package?
    Yes, the Tekonsha T-One Vehicle Wiring Harness # 118276 will fit on your 2022 GMC Acadia that did not come with the factory tow package. The factory connectors are located behind your bumper cover that the Tekonsha harness will connect into. I recommend using the Mounting Brackets # 18136 and # 18138 to secure the 7-way to your receiver without having to drill into it. If your trailer has brakes the Curt Echo Wireless Trailer Brake Controller # C51180 will connect to the Tekonsha 7-way...
    view full answer...
  • Will 7-Way 118276 Interfere With Panel on 2019 GMC Acadia With Draw-Tite Trailer Hitch 76023
    That's a really good question, and you will be able to re-install the panel on your 2019 GMC Acadia without interference with the T-One Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector # 118276 mounted to the Draw-Tite Trailer Hitch Receiver # 76023. I have added a photo from our installation video of the harness on a '19 Acadia with the Draw-Tite hitch, and as you can see, the 7-way will be back behind where the panel re-installs, you just want to make sure the...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch And Trailer Wiring For 2017 GMC Acadia Without Factory Tow Package
    The trailer hitch we offer that is designed for your 2017 Acadia is the Draw-Tite, part # 76023. This is a Class lll hitch and it has a 2-inch receiver opening. If you are mechanically inclined you should be able to install the hitch with no problem. If you are not comfortable you can have a trusted mechanic complete the installation for you. I am attaching the installation instructions in a separate email. If you plan on doing some towing you might be interested in etrailer ball mount...
    view full answer...
  • Plug and Play Wiring Kit for a 2018 GMC Acadia
    Are you looking for a 4-way or 7-way connector to tow a trailer? We actually have both that are plug and play that fit your 2018 GMC Acadia. If so the 4-way I recommend is part # 118720 and the 7-way is part # 118276. I've linked videos of them both installed onto a 2017 Acadia which uses the same parts. If you're actually looking for wiring so you can tow your Acadia behind a motorhome then we don't have a plug and play at this time. The easiest lighting kits to install are magnetic...
    view full answer...
  • Is There a Plug-In-Play Trailer Wiring Harness for 2019 Chevy Blazer with 4 and 7-Way
    I do have an option to obtain both a 4 and 7-way trailer connector on a 2019 Chevrolet Blazer but all of the plug-in-play harnesses like the T-One Vehicle Wiring Harness part # 118276 only come with either a 4-way or 7-way, not both. However, all you need to do to obtain both is purchase one of the plug-in-play 7-way trailer wiring harnesses and then replace the plug on it with the 7- and 4-Pole Trailer Connector Socket part # HM40975. In regards to brake assist, there will be no additional...
    view full answer...

< Previous

Do you have a question about this Custom Fit Vehicle Wiring?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Thomas T
Video by:
Thomas T

At 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.