1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 7 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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Tekonsha Custom Fit Vehicle Wiring - 118289
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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. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118289 or order online at etrailer.com. 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.
  • All Info
  • Reviews (36252)
  • Q & A (9)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118289

  • Custom Fit
  • Trailer Hitch Wiring
  • 7 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.


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 Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (36228 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.

- 118289
by:
2016 Acura MDX

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



- 118289
by:

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



- 118289
by:

Great company, friendly service, great easy website information


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


- 118289
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!



- 118289
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.



- 118289
by:
2017 Acura MDX

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



- 118289
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.



- 118289
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.



- 118289
by:

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



- 118289
by:
2019 Acura MDX

I love eTrailer!!!



- 118289
by:
2017 Acura MDX



- 118245
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug and play. Hitch was placed on a board and jacked up to meet the bolt holes. Remounted the two tow hooks. Not a lot of extra threads but they all fit perfectly. Glad I had an impact. Wiring had to remove protective cap and plugged in. 4 runner already had a fuse in the box. Bought the 4 flat plug mount but drilling up into hitch proved to be to much so just used a good hose clamp to secure the plug. Also more adjustable wire length if needed.



- 118258
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Product quality very high, delivery very fast, shipping container (cardboard box) was not strong enough to support handling/shipment, box bottom was ruptured with hitch assembly hanging out, box should be supported stronger, no parts missing, hitch was scratched up somebut, nothing that a little black paint didn't fix. I installed the wiring harness connections and fuse box on the external side of the vehicle to eliminate having to take apart the internal sheet metal panels and providing easy access to the fuse in the event of fuse failure, this eliminates the necessity of interior Panel removal to change a fuse. Easy installation, product has great great design features ,great customer service with prompt delivery. Just ordered the bracket (#18140) to secure the 4 prong plug to the hitch neatly and secure to eliminate the loose plug. (not shown in photos (Bracket in transit),


Comments
Great, works like a charm.
Anthony J - 09/27/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This kit is very easy to install on my 2012 Honda Pilot EX-L and came with almost everything needed to install it. It was only missing 4 screws to secure the 7 pin plug onto vehicle’s the plastic trim but any type of small screws or bolts would work. Definitely recommended to anyone who’s looking to install a 7 pin trailer harness.



- 118241
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Becuase if this website it was easy to find what was needed for my truck to tow. Very detailed installs online. The best part was everything was bolt in and no drilling required along with plug and play wiring harness. Definitely will be another custom tee in the future!



- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Just installed Draw Tight hitch, wire assembly along with the brackets for a nice look. Everything went smooth with installation and it has a nice clean look as the hitch is well hidden. This is going to work for our bike rack and the cargo carrier I am now going to by. Now I can also get a small utility trailer to pull and haul stuff. I strongly recommend etrailer for all your needs as they communicated with me the whole way through and readily replaced a lock unit that somehow came without the key. Customer service is top notch.


Comments
Absolutely Fine!
Scott N - 04/26/2020


- 118264
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This is a perfectly tailored product for the do-it-yourselfer who with a little help adds a nice hitch to his vehicle. Getting an older vehicle's OEM installed weld nuts clean takes most of the time followed by installing the two washers and nuts in the fascia area. That part needs patience as the work area is limited. The Curt LED 4-Way Flat Connector (Vehicle End) Tester makes it very simple to verify the Tow Package - 4-Pole Flat Trailer Connector that is a snap to install to the vehicles pre-existing harness. One point to pay attention to in the instructional video is when pulling the square washer and bolt through the channel. They must slide in single file as shown. If you try to pull with the bolt through the washer it will get stuck and you will need to fish it out. So bottom line. Great product. Great support. Steve Stewart


Comments
Everything from the hitch to the wiring still works perfectly. Very pleased with the results
Stephen - 05/07/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I purchased this for my 2013 Honda Pilot EX-L. I have not used the wiring harness yet, but the installation was extremely easy and quick. The instructions were very straightforward, and I was able to install everything within 30 minutes. Everything you need is inside the package except some bolts/nuts to mount the connector. I decided to cut out a hole and drill some holes for bolts. I opted for some black ones to match the colors. I'm extremely happy with this product and etrailer's fast and reliable service.



- 118248
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Wish I bought etralier's tow harness earlier. Easy installation. Toyota dealership sold me the wrong one and of course waited too long to return. But use some of the parts from that harness on the one from etrailer(see pics). Would order again from etrailer. Thank you



- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug & play for 2020 Kia Sorento. Dinged a star because the trailer connector does not fit the extra bracket well. It does not appear to have been designed for a bracket mount. I had to force fit and secure in place with a zip tie.



- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Needed a harness for my 2015 Honda Pilot LX and didn’t want to pay a king’s ransom for dealer parts and install. Ordered from etrailer and got a deal. Came with everything I needed and also had excellent, easy to understand instructions. Works perfectly.


Comments
This harness has worked like a charm. No problems at all.
Randy B - 06/01/2020


- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Good product and great service from etrailer! !!!Important note: 2012 Nissan Xterra (depending on what factory it was built) has the 12v power and brake wire REVERSED on the factory installed harness. Meaning when you plug in your trailer, there will be constant power to the brakes on no power to the charge line. If this happens to you like it did to me, you need a tester and a couple butt connectors to make the switch at the 7 pin connector. Also note, these plugs use the trailer for the ground so you're tester wont read if the trailer is not plugged in and you have to hold one of the tester ends to metal on the trailer.


Comments
Thank you for your review. This is a common issue on the Nissans. I have attached a very helpful article that explains the issue and how to fix it.
-- Etrailer Expert Heather A - 05/12/2021


- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


FITS the new 2020 HIGHLANDER! There is a new connector with the 2020 Highlander redesign under the driver side rear bumper. This cable plugs directly into the Highlander connector. See photo. There is no need to route or run wires for the trailer wiring. You will also need a converter to provide the correct signals to this cable. I recommend using the Toyota Plug-n-play converter part number: PT725-48200. It’s around $60 online. Be aware it is installed behind a panel located next to the driver’s side second row seat. Toyota completely changed the vehicle wiring for the 2020 model year. I also recommend the CURT C99FR hitch. Fits perfectly, easy to install and hides behind the bumper.



- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


The hitch is great, but the screws for the electrical connector have rusted.


Comments
It’s still working. The screws are still rusted, though.
Tim M - 07/18/2020


- 118266
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This kit worked great. It took about an hour to install on my 2005 Xterra. The process was just like the video on etrailer.com. The only difference was that I mounted the bracket directly to my bumper instead of the hitch.


Comments
Working great. Im glad I purchased the 7-pin version for this car
Keith - 07/16/2020

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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • 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...
  • 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...
  • 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...
  • 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...
    view full answer...
    Image 1 for
  • 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...
  • 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
  • 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...
  • 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...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
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Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
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Updated by:
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Employee Isabelle B
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