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

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

Item # 118289
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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. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118289 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price 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 (12)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118289

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 Round - Blade
  • 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.


  • 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


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


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 Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (12 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.


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!

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.

2016 Acura MDX

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


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

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.


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!

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.


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

2017 Acura MDX

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


Great company, friendly service, great easy website information

Works Great...Except I found out It only works when the headlights are turned on. Not a problem.
Russ - 08/27/2020

2019 Acura MDX

I love eTrailer!!!

2017 Acura MDX


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

  • 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...
  • 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...
  • 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...
  • 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...
  • 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 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...
  • 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...
  • 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...
  • Bracket Needed to Mount T-One Wiring Kit to Draw-Tite Hitch on 2020 Acura MDX
    I went out to the warehouse and verified that the holes used to mount the Hopkins Bracket # HM48625 are compatible both with the T-One Wiring Kit # 118289, and with the mounting bracket on the Draw-Tite Trailer Hitch # 75225 that you purchased for your 2020 Acura MDX. The only other thing that you're missing is a ball mount kit (if you don't already have one) and for that I recommend the Kit # 989900 because it includes two ball mounts, one with a 3/4” rise/2” drop and the other with a...
    view full answer...
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  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
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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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