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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. 7 Round - Blade
  4. Custom Fit
  5. Trailer Hitch Wiring
  6. Powered Converter
T-One Vehicle Wiring Harness with 7-Way Trailer Connector
Tekonsha

T-One Vehicle Wiring Harness with 7-Way Trailer Connector

Part Number: 118289
In Stock
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$76.74
Retail:$135.60
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Custom Fit Vehicle Wiring

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118289 - Custom Fit Tekonsha Trailer Hitch Wiring
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Quickly and easily install a 7-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118289 or order online at etrailer.com. Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 7-Way Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (24)
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Tekonsha Custom Fit Vehicle Wiring - 118289

  • 7 Round - Blade
  • Custom Fit
  • Trailer Hitch Wiring
  • Powered Converter
  • Tekonsha

Quickly and easily install a 7-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 7-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • 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 in rear cargo area
    • Plug in connector
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • 4 Mini fuses included
    • (2) 7.5 Amp fuses
    • (2) 20 Amp fuses


Specs:

  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 12 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's junction box, which is located in your rear cargo area, behind the driver's-side trim panel in the spare tire compartment. You will need to remove the cargo nets, floor hatch, and some interior paneling to access this box. Once you've plugged in the connector, insert the included fuses into your junction box as indicated in the instructions.


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 plug on your automobile and the 7-way connector itself - to help prevent corrosion.


ModuLite Powered Tail Light Converter

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. Note: This will not affect how the tail lights on your vehicle operate.


With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118289 Tekonsha T-1 T-Connector - 7 Wire - Modu-Lite

Installation Details 118289 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness with 7-Way Trailer Connector - 118289

Average Customer Rating:  4.7 out of 5 stars   (24 Customer Reviews)

Quickly and easily install a 7-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

by:

Had it professionally installed and it works perfectly as it was designed to work. I use it for my fancy bike rack by Saris that has an electric lift which I use for our 60 pound bikes. Also has all the usual trailer lights. turn signals, back up lights, etc. which help a lot because the bike rack blocks most of the car lights.



by:
2016 Acura MDX

I have a 2016 Acura MDX. The wiring at the connector doesn’t match the signals coming out of my car, so this is completely non functional. I discovered this after testing the harness a month after installing. It otherwise fits fine and seems to be designed for my car. Instructions were good wasn’t too difficult to install.



by:
Acura MDX

This worked perfect in our 2020 Acura MDX. Great directions and easy to set up. I also appreciated the great service and support from etrailer.



by:

Installation was easy with the included instructions. The only problem was the pre drilled holes to attach the cover did not align with the factory hitch. I had to use 4 zip ties to attach the harness to the hitch



by:

Almost plug and play. Go to YouTube, watch a couple videos and take your time. The ship time and packaging were great. If I needed another, I’d go with etrailer again.



by:
2018 Acura MDX

Super fast shipping service and excellent customer service via email. Photos to be added after install.

Richard profile picture

Richard

10/21/2023

Great



by:

Easy to sort through the products by using the date and the model #



by:

I’ve used etrailer for all of my hitch and trailer needs for years now and I think they’re terrific. Any questions are always answered accurately by their professional staff, and the customer service has been outstanding! I recently had a shipping issue that was quickly handled and resolved in almost no time at all.
Thank you to Teresa J for taking such good care of me!



by:
2020 Acura MDX

Trailer hitch and wire harness works and fit great. The bracket that is supposed to hold the plug is not even close to lining up with the holes on the plug.



by:
Acura MDX

Products arrived on time, they were a perfect match to my Acura MDX , the video helped in instation - overall a good experience



by:
2018 Acura MDX

Product arrived ahead of schedule even with Hurricane Dorian slamming Florida. I have purchased several products from etrailer and I am very happy with the items and the service.



by:
2016 Acura MDX

As near to plug and play as you can get. The biggest issue is threading the cable through the vehicle to get it to the hitch. Two pairs of hands would make this process much easier. All connections were correct. Instructions are very clear.








by:

The package arrived earlier than I thought. Well, packaged, with no damage to anything. Easy to install, just as advertised!! This was my first purchase from e-trailer and it was great!! So happy!



by:

Great company, friendly service, great easy website information

Russ profile picture

Russ

8/27/2020

Works Great...Except I found out It only works when the headlights are turned on. Not a problem.



by:

Great product, great and easy to follow instructions and of course, great price!



by:
2017 Acura MDX

Easy install, well setup and good instructions. Works as it should



by:

The product I order was the perfect fit for my vehicle.



by:
2019 Acura MDX

I love eTrailer!!!



by:



by:
2016 Acura MDX



by:
2016 Acura MDX

Great instructional pictures and excellent product, went off without a hitch! Lol



by:



by:
2017 Acura MDX



by:
2017 Acura MDX


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

  • Recommended 4-Way 7-Way Combo Connector for a Factory Wiring Harness
    Yes, it will. The 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket item # HM40975 connects to the standard USCAR connector. A USCAR 7-way socket is a standardized automotive electrical socket that provides a connection point for trailer wiring so it will work perfectly with the T-One Vehicle Wiring Harness with 7-Way Trailer Connector item # 118289. Please note that only one connector a 4-way or a 7-way can be used at a time because the covers on this socket will not open far...
    view full answer...
  • No Power To Brake Controller After T-One Vehicle Wiring Harness with 7-Way Install On 2015 Acura MDX
    It's possible that after you install both the T-One Vehicle Wiring Harness with 7-Way Trailer Connector part # 118289 and Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 with Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3028-P on a 2015 Acura MDX that you still need to insert more fuses into the factory fuse box to power up the controller. These fuse locations will be listed either in the owner's manual or on the underside of the fuse box lid.
    view full answer...
  • Easy Brake Controller Solution for 2018 Acura MDX without Trailer Wiring
    I have a solution that would allow you to install a brake controller in your 2018 Acura MDX without factory wiring. You'll need the Redarc Tow Pro Elite part # RED44FR that you mentioned with the install harness # 3028-P and then the 7-way kit part # 118289 and you'd be set. All of the brake controller wiring is present on the versions of your vehicle with or without the tow package.
    view full answer...
  • 7-Way Trailer Wiring Harness that Fits 2019 Acura MDX
    We do have a 7-way trailer wiring connector kit that fits your 2019 Acura MDX with the part # 118289 which is custom fit.
    view full answer...
  • Recommendation for 7-Way Trailer Connection on 2020 Acura MDX
    Yes, the Tekonsha Vehicle Wiring Harness with 7-Way Trailer Connector # 118289 will include the backup/reverse lights. You will not need to splice any wires on your 2020 Acura MDX for this connection. You will also want a Mounting Bracket # PK12711U for the installation of your 7-way connection. This will allow you to mount the 7-way on the exterior of your MDX near the receiver hitch.
    view full answer...
  • Parts Needed to Install 7-Way and Prodigy P3 Brake Controller on 2014 Acura MDX
    To install the Prodigy P3 part # 90195 on your 2014 Acura MDX that does not have a factory 7-way you'd need to first start with a 7-way kit part # 118289 and then use the brake controller install harness part # 3028-P and you'd be set with everything needed.
    view full answer...
  • Will Installation of the Tekonsha 118289 Require Removal of the Hitch on a 2014 Acura MDX
    No, you will not need to remove the hitch to install the T-One Vehicle Wiring Harness with 7-Way Trailer Connector # 118289. This is going to be a really simple, plug and play process so you've got nothing to worry about. You may want to consider adding a mounting bracket to this so you don't have the plug just hanging down. For that, I recommend using the Mounting Bracket and Installation Hardware - Pollak 7-Pole, RV-Style Trailer Connector - Vehicle End # PK12711U, which comes with self...
    view full answer...
  • Parts Needed to Control Trailer Disc Brakes on 2015 Acura MDX
    In order to control the brakes on your trailer, you will need a brake controller. Since you're going to be installing the Tekonsha # 118289 on your 2015 Acura MDX, you don't already have the towing package in place, which would mean that you'd need to hard-wire most brake controllers in. Because of this, I recommend using a wireless brake controller like the Curt Echo # C51180, which won't require any wiring of the controller into the cab of the vehicle since it simply plugs into the...
    view full answer...
  • Troubleshooting 7-Way Wiring Installation on 2017 Acura MDX
    The Tekonsha T-One Vehicle Wiring Harness with 7-Way Trailer Connector # 118289 is confirmed to fit your 2017 Acura MDX. This fits all models so it is not a matter of your vehicle not being supported. You are correct, you won't get anything on the blue wire for the brakes without a brake controller like the # RED44FR. The black 12V power should be working if properly installed. Since you already have a tester, try testing the wire behind the end of the connector. It is possible the wire...
    view full answer...
  • Brake Controller and 7-Way Trailer Wiring for 2020 Acura MDX
    Since the brake controller wiring is present on your 2020 Acura MDX all you'd need is the 7-way kit part # 118289 like you mentioned, a brake controller like the Brake EVN # TK63VR, and an install harness part # 3028-P and you'd be set.
    view full answer...
  • Will the etrailer Trailer Hitch e98840 for 2017 Acura MDX Work for Boat Towing
    The # e98840 etrailer Trailer Hitch Receiver has a maximum gross towing weight of 6,000 lbs and tongue weight of 900 lbs. As long as the boat you are towing does not exceed these weights the hitch will not have any issues. If you are towing a larger boat, it is possible to increase the gross towing weight to 8,000 lbs by using weight distribution. I also recommend checking your vehicle owner's manual for its specific capacities. You will need to follow whichever capacity is lower, the hitch...
    view full answer...
  • Trailer Hitch Fit for 2018 Acura MDX w/ Full Size Spare Tire
    None of the hitches we offer for the 2018 Acura MDX would allow a full sized spare to be stowed under the vehicle with the hitch installed. Your best bet would be to go with the compact spare, and if you get a flat while towing install the compact spare and carefully limp the trailer someplace safe where you can leave it until you can get the flat tire repaired or replaced. I wouldn't recommend towing any further on that compact than it would take to get to a safe place. Of the available...
    view full answer...
  • Does Trailer Wiring Harness for 2017 Acura MDX Require Connection to Vehicle Battery
    To install the Tekonsha # 118628 trailer wiring harness on your 2017 Acura MDX, you wouldn't need to run a separate circuit to the battery, as that's been done at the factory. All you'll need to do is plug the connector in at the junction box in the cargo area and install the fuses as outlined in the linked instructions. The 7-way kit, part # 118289 would be the same. If you went with the 7-way, and your trailer has brakes you'll need to install a brake controller to actuate them. The...
    view full answer...
    Image 1 for
  • Is a Relay Required for a Wiring Harness on a 2020 Acura MDX
    While you are correct that a wide variety of trailer wiring harnesses do require the installation of a relay, this is not the case for your 2020 Acura MDX. I recommend going with one of our Tekonsha wiring kits because we have found that their converter boxes tend to be the most reliable. For a 4-Way plug you need the T-One # 118628 but for a 7-Way plug you need the T-One # 118289 for a 7-Way plug. It is worth noting that even though you don't install any relays, you do need to install...
    view full answer...
  • Plug & Play Harness For Redarc Tow-Pro Elite in 2020 Acura MDX
    Hi John, We can get your 2020 Acura MDX set up with the Redarc brake controller and there is a plug-and-and play harness that will work. You were also correct about the 7-way, and that's what will allow you to use the plug-and-play harness. First, lemme go ahead and list out the parts you need: - Redarc Tow-Pro Elite Brake Controller for Tekonsha Harness # RED63RR - Tekonsha Plug-In Wiring Harness # 3028-P - T-One Vehicle Wiring Harness with 7-Way Trailer Connector # 118289 The Tow-Pro...
    view full answer...
  • Parts Needed To Add 7-Way To 2022 Acura MDX
    Hey Steve, thanks for reaching out. The Tekonsha # 118289 you mentioned is only for the 2014-2020 Acura MDX, so this will not work for the 2022 model. We do have a wiring solution for the 2022 MDX, but it does involve hardwiring a tail light converter. You can use the # C59236 and the # ETBC7 kit to complete your 7-way wiring. I have linked install videos for both products for you below.
    view full answer...

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


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Matthew E
Updated by:
Matthew E
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C
Employee Bradley B
Test Fit:
Bradley B

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