T-One Vehicle Wiring Harness with 4-Pole Connector

T-One Vehicle Wiring Harness with 4-Pole Connector

Item # 118779

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Tekonsha Trailer Hitch Wiring - 118779
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  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Tekonsha
  • Powered Converter
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118779 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 4-Pole Connector. Custom Fit Vehicle Wiring reviews from real customers.

  • All Info
  • Reviews (15)
  • Q & A (19)
  • Videos (2)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118779

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.

Once installation is complete, the 4-way flat connector will be stowed beneath and to the center of the vehicle. A mounting bracket (sold separately) is recommended to keep the connection secure.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole 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.

118779 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

118779 Installation InstructionsInstallation Details 118779 Installation instructions

This Product Fits The Following Vehicles

2019 - 2019 Jeep Cherokee

2019 - 2019 Jeep Cherokee without factory tow package

California residents: click here

Video of T-One Vehicle Wiring Harness with 4-Pole Connector

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

Video Transcript for Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118779 Review

Speaker 1: Today we're going to take a look at the T-1 vehicle wiring harness with the four way flat trailer connector. Now this is a custom fit part. It is designed to fit the 2019 Jeep Cherokee, and on a custom fit part I always like to recommend inaudible 00:00:13 our website, use our fit guide, put in your year and model vehicle, and it'll show you if this will work for your application. Now this part will provide a four way flat trailer connector at the back of your vehicle to power your trailer's signal lights. It is compatible with five pole, six pole, and seven pole adapters that we do sell separately. This whole harness connects very quickly and easily.Basically just locate your connection point, which will be behind the taillights on your vehicle.

Take these T-connectors. Plug in T-connectors, one on each side. One for the driver's side, one for the passenger's side. You'll ground your white wire, and then your power wire you just run to your vehicle's battery. Now it does include this ModuLite power converter, this black box here.

This is to ensure that your vehicle's wiring will match that of your trailer. It is a power module so you will connect it to your vehicle's battery, and that's to avoid overloading your vehicle's electrical system.Now the wire that the four way's attached to is the 16 gauge bonded wire. If you notice the four way has this nice integrated dust cover, that when you're not plugged into your trailer you can just put a cover over your terminals. It protects them from any damage or from the elements. Now a few specs on this harness.

The maximum amperage on the stop and turn light circuits is five amps per circuit. On the taillights it's 7.5 amps per circuit. Now it does come with everything shown here on the table.A nice set of detailed instructions that'll describe how to install it with pictures. But basically how you install it, what you want to do again is go to the rear of your vehicle, locate behind your taillights, and you want to start with the driver's side. You'll take this T-connector that has the yellow wire in it.

That's for the driver's side. You unplug your harness from your taillights. Plug this in between there, T-connector, and then you'll take the other harness that's for the passenger's side, has the green wire in it, run that over to the passenger's side. Has a length of wire here. Once you get over there, same way. Plug this in behind the taillights. Once they're all plugged in, this ModuLite you do want to attach this to a good flat surface so it doesn't bounce around. They do have a bracket on it with a hole in it. You can put a screw in there to hold it in. They do include some double face tape you could use also.Once that's attached down, take your bonded wire that the four way's attached to, run that out the back. And then your last two wires you want to connect to the ground wire. The white wire has an eyelet on it. Connect that to a good clean ground that's nearby. If there's not one nearby, they do give you a grounding screw that you can make your own ground. And then the last wire will be your black power wire. This'll run to your vehicle's battery. So what you'll want to do is run this . You don't want to run directly to the battery. You want to run it through the fuse holder. So they give you some connectors that you'll connect the power wire to. Connect it to one end, and then the other end.What you'll do is take the eyelet, put that on there, and this is what'll connect to the vehicle's battery. Once that's all connected, pop open your fuse holder, take your 15 amp fuse, install it in there, close it, and your harness is all ready to go. Now they do give you some extra cable ties to take up any slack in the wiring. But that should do it for the review on the T-1 vehicle wiring harness with the four-way flat trailer connector.

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Connector - 118779

Average Customer Rating:  4.9 out of 5 stars   (14 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

- 118779

Very easy and quick to install. I removed the lower bumper shroud and nothing more. Fits perfectly around the muffler and required no cutting of anything. 633150

- 118779
2019 Jeep Cherokee

Installation was easy did it by myself wiring went well too. 2019 Jeep Cherokee 546377

- 118779
2019 Jeep Cherokee

The product arrived in a timely manner and the install was a breeze with the aid of online videos. 553029

- 118779

Working with etrailer was a breeze, and getting the best/exact hardware and advice for my trailer needs, wiring requirements and solutions was 100% on point. It was a great help to have the exact videos and background information about installation, best methods and things to look out for.. during my hitch setup! They are heads and shoulders above all others in support, products, and service! A+ 717131

- 118779


- 118779

A very easy install, especially if you have a hydraulic lift. Without a lift, you'll crawl around on the ground and reach for a few Advil tablets the next day! I hid and protected the + wire by unbolting the escutcheon that covers the underside of the car. If you haven't already undercoated your vehicle, I recommend having it done it AFTER you install the wiring. A freshly undercoated car is a mess to install anything on especially if it involves contact with the underside of the vehicle. For a fish, I used a simple strand of nylon cord with a small nut on the end...it's a straight run to the underside of the car and gravity makes for a good companion. I removed the 4 bolts that attach the plastic bumper to the underside of the body when it came time to hide the wires connecting the left side to the right side (makes for an easy and attractive installation). 698009

- 118779

Great products, easy to follow videos, super helpful staff Thank you Ashley for your help with the order. 696276

- 118779

Went in easy. Video was very helpful. Haven't used it yet. 693896

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2019 Jeep Cherokee

Everything went well till I ran the wires to the passenger side the red wire was not as long as the green. Did not have enough to get the wires up to plug them into the light that is the only complaint other than that they work fine 656269

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2019 Jeep Cherokee

The wiring harness I bought for my 2019 jeep Cherokee fit perfectly. The hardware package had everything needed to do the job .good product. 651818

- 118779

As always E Trailer has exceptional service and fast Delivery. 643628

- 118779

Easy to install for 66 year old handicap guy. It's the getting up and down off the concrete. 637996

- 118779
2019 Jeep Cherokee

The wireing trailer hook-up for my 2019 jeep cherokee ,item #18779 works perfectly! The instructional is excellent. If I need another product, I know where to go. Thank you e-trailer! You saved me about $200. 637148

- 118779
2019 Jeep Cherokee

The wiring harness worked perfect on my 2019 Jeep Cherokee Latitude Plus. 580115

- 118779

Item works great fast shipping. 574486


Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

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

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Info for this part was:

Edited by:
Lindsey S
Installed by:
Jeff D
Video Edited:
Dustin K
Updated by:
Alexander C
Updated by:
Isabelle B
Written by:
Ronnie R
Test Fit:
Shane H
Video by:
Michael B

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