1. Custom Fit Vehicle Wiring
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  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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Our Price: $120.19
Custom Fit Vehicle Wiring

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118289 - 7 Blade Tekonsha Custom Fit Vehicle 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. Call 800-298-8924 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 (8)
  • Q & A (3)
  • Videos (1)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118289

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

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

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118289

Today we're going to take a look at the T-One vehicle wiring harness with the 7-way trailer connector. Now this is a custom-fit part. It is designed to fit the 2014 and newer Acura MDX vehicles. And on a custom-fit part like this, I like to recommend for you to go to our website, use the fit guide, put in your year, model vehicle, and it'll show you if this'll work for your application.Now this harness provides this 7-way flat trailer connector at the back of your vehicle to power your trailer signal lights. It is compatible with 4-pole, 5-pole, and 6-pole adapters, so we do sell separate on our website. And this harness does connect very quickly and easily.

There's no cutting or splicing of wires.Basically what you do is you . this connector here will plug 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. And you have this white wire. This you want to ground to a good, clean ground. Plug these connectors into your back of your 7-way.

And then they include four fuses that you put into your fuse box to make your system operational.Now it does include this ModuLite. This is to ensure that your vehicle's wiring will match that of your trailer. It is a powered module, so it does connect directly to the battery to avoid overloading your vehicle's electrical system. The wiring in this harness is a 16-gauge bonded wire. And as I mentioned, it does include these four mini-fuses, two 7.5-amp fuses and two 20-amp fuses that they'll show you in the instructions where to connect them in your fuse box.A few specs on this.

The maximum amperage on the stop-and-turn light circuit is 4.2 amps per circuit, tail lights is 12 amps per circuit, and again, it comes with a nice set of detailed instructions with pictures on how to connect this.But again, basically what you'll do is go to the rear of your vehicle. In the rear cargo area and in the spare tire compartment you'll see the junction box where this'll plug into. Once that's plugged in, you'll have your white wire with this eyelet on it. Connect that to a good, clean ground if there's one nearby. If not, they include this grounding screw that you can make your clean ground.And then what you want to do is this ModuLite box is a little heavy.

You don't want that bouncing around. They do give you this piece of double-face tape that you can put on there. Attach that to a good, flat surface so it doesn't move around. And then you'll just run this wiring out towards the back. And in the instructions it says there's a grommet in your trunk that you can actually remove. Run that wiring through there back to the rear bumper. Plug these into the back of the 7-way. You can see it has this little connector here that you can just pop off. And then make your plug-ins right there. Make sure you get the connect color wire to the correct function. Once that's all plugged in, then you can put that to the back.Now it does not come with a mounting bracket. We do require a mounting bracket. You should install that and have this bolt to the mounting bracket. We do sell those items separately on our website. And usually on this product page, there is a mounting bracket listed as a related product.Once that's all connected, then you have these extra cable ties that they give you. Those you can wrap to keep the wire from hanging down. You can use those extra cable ties to secure it.But that should do it for the review on the T-One vehicle wiring harness with the 7-way trailer connector.

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (8 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

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! 876487

- 118289
2017 Acura MDX

Easy install, well setup and good instructions. Works as it should 870194

- 118289
2019 Acura MDX

I love eTrailer!!! 857018

- 118289

Great product, great and easy to follow instructions and of course, great price! 819259

- 118289
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. 730245

- 118289
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. 697484

- 118289

Great company, friendly service, great easy website information 694135

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


- 118289
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. 680184


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...
  • 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...

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Info for this part was:

Edited by:
Lindsey S
Installed by:
Jeff D
Video Edited:
Jacob T
Video Edited:
Chris R
Written by:
Alexander C
Updated by:
Matthew E
Updated by:
Isabelle B

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