1. Custom Fit Vehicle Wiring
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  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Connector

T-One Vehicle Wiring Harness with 4-Pole Connector

Item # 118779
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118779
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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 (26)
  • Q & A (37)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118779

  • Custom Fit
  • Trailer Hitch Wiring
  • Tekonsha
  • 4 Flat
  • 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.


Features:

  • 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


Specs:

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


Installation

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

Installation Details 118779 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (26 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
by:
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


Comments
Not so well
George E - 06/11/2020

80465

Can you tell me

-- Heather A - 6/11/2020


- 118779
by:

I AM VERY HAPPY WITH THE PRODUCT AND EASE OF INSTALL. ALSO, THE STAFF THAT WAS HELPING ME, KNEW WHAT I WAS LOOKING FOR AND HAD NO DOUBT I'D BE ANOTHER SATISFIED CUSTOMER. THANKS A BUNCH DAVE B. ..... 714458



- 118779
by:

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


Comments
I bought the plug and play wiring kit for two Jeep Cherokees and a Chrysler 300. All of them were truly plug and play and I haven’t had a problem with either one.
Robert S - 05/19/2020

76993

- 118779
by:
2019 Alfa Romeo Stelvio

Bottom line.. eTrailer is tops in my book with anything trailers and hitches. Carol was able to work out the best solutions for me, and I can't remember who I followed up with regarding my wanting the trailer Tekonsha harness for my Jeep, but they were super too! See my picture in Carol's email (attached)! No doubt the talking (phone), and helpful videos for exactly my brand of Jeep were instrumental in making the installation easier and faster.. with a lot less banged knuckles ;-)! You Guys and Gals Rock! [Thumbs up] 717891



- 118779
by:

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



- 118779
by:

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
by:

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
by:
2019 Jeep Cherokee

Super easy ordering process and fast de livery! 881522



- 118779
by:

Great product and helpful website with videos 830744



- 118779
by:
Jeep Cherokee

Easiest wiring to the Jeep Cherokee it wnt on without any trouble. I would use this product again if another vehicle needs to done. 824552



- 118779
by:
Jeep Cherokee

This kit was Awesome! Fit the GFs Jeep perfect. easy to do while installing the hitch! Just unscrew a few screws and pop out the tail lights, plug in and put the tail lights back in. For the Jeep Cherokee, I unbolted the driver side skid plate and zip tied the power wire to a break line and put the skid plate back. crimped the power wire and fuse wires and tied it to a power post under the hood! Easy Peasy! 817294



- 118779
by:

One year review. Pretty easy install. Connectors are perfect and made that part easy. Running the power wire up to the battery is the hardest part. Still working just fine. Good buy and I would highly recommend both this and etrailer too. 807628



- 118779
by:

Haven’t had any problems after a year. Simple plug and play set up 797916



- 118779
by:

Ouwtsatanding. Serxvice 796481



- 118779
by:

Ordered the hitch and wiring kit for the trailer lights on the website, had it within a week and the install of the hitch and wiring was fairly quick and simple. All the hardware was included and everything has held up great. Overall a very solid product! 790674



- 118779
by:

Received order on time have yet to install it will be a while yet till we get all completed thanks 783475



- 118779
by:

Was impressed with how quick to receive what I ordered and how detailed the video was for the install. Would recommend to friends family or anyone who has the time to save money on own install. 722529



- 118779
by:

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
by:

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



- 118779
by:
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
by:

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



- 118779
by:
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 etrailer! You saved me about $200. 637148



- 118779
by:
2019 Jeep Cherokee

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



- 118779
by:

Item works great fast shipping. 574486



- 118779
by:
2019 Jeep Cherokee

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


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Parts Needed To Tow Small Pace American 4 x 6 Enclosed Trailer With 2020 Jeep Cherokee
    To tow the small Pace American 4 x 6 enclosed cargo trailer with the 2020 Jeep Cherokee you will need a hitch (you already have), 4-way wiring, a ball mount, lock and hitch ball. I recommend Tekonsha T-One Vehicle Wiring Harness with 4-Pole Connector part # 118779 which is known to last a bit longer compared to the other wiring options available. You also need Curt Ball Mount part # C45070 which will give you the rise that you need. If your coupler is the standard height of 17" from...
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  • Recommended Trailer Wiring Harness for 2019 Jeep Cherokee
    We can do a little better than the $ 250.00 the stealership wanted to charge you. The # 118779 would indeed be the correct wiring harness for your 2019 Jeep Cherokee Trailhawk. This connector provides a standard 4-pin trailer connector that provides only the basic lighting functions. You can see the installation on a 2019 Cherokee by clicking the provided link. If the trailer you're wanting to tow has brakes, you'll need to go a step further and upgrade to a 7-way trailer connector with...
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  • Aftermarket Trailer Wiring Harness for a 2019 Jeep Cherokee
    For your 2019 Jeep Cherokee, the T-One Vehicle Wiring Harness part # 118779 is a confirmed fit and will work for you. This is a brand new wiring harness that was developed specifically for the 2019 model year and that is all it will fit. This is not an OEM harness like something you would find in a dealer catalog as it is an aftermarket part that is supplied and test fit by third party manufacturers such as Tekonsha. In regards to the activation of the tow package wiring, that will...
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  • Custom 4-Pole Wiring Harness for 2020 Jeep Cherokee
    The Curt 4-pole wiring harness # C56406 and the similar Tekonsha # 118779 will work great on a 2020 Jeep Cherokee without the factory tow package being present. I recommend the Tekonsha kit because in our experience their wiring products are the most reliable. Both of these custom-fit kits plug in to the wiring at the tail lights and they will give you a 4-way flat trailer connector. These harnesses feature a powered tail light converter that will protect the vehicle's internal wiring from...
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  • Will Installation of a Trailer Hitch and Wiring Void Warranty on a 2019 Jeep Cherokee Latitude
    Installing a trailer hitch like the recommended Curt # C13395 and wiring like the T-One # 118779 that you referenced will not void the warranty on your 2019 Jeep Cherokee Latitude unless the problem was the direct result of the installation. This is covered under the Federal Magnuson-Moss Warranty Act.
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  • Will Installing an After Market Wiring Harness Void Any Parts of My Warranty on a 2019 Jeep Cherokee
    If you splice into factory wiring that can be an issue with warranty, but if you use an aftermarket harness like the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Connector # 118779 on your 2019 Jeep Cherokee you will be fine. The harnesses like this that don't alter the factory equipment in any way cannot void your warranty. You will be protected by the Magnuson–Moss Warranty Act. This act states, in part, that unless the installation and the part caused a problem then the warranty...
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  • Best 4-Pole Wiring Harness for my 2020 Jeep Cherokee?
    There are two four pole trailer wiring options for the 2020 Jeep Cherokee. I prefer the Tekonsha # 118779 over the Curt T-connector # C56406, The Tekonsha's module is much smaller and is easier to mount and hide in the undercarriage of the vehicle. Since your vehicle didn't come from the factory with wiring, it probably didn't come with a hitch either. I recommend # C13395. This hitch is concealed behind your bumper cover and only the receiver tube is visible from behind the vehicle....
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  • Troubleshooting T-One Trailer Wiring Harness Where Vehicle Tail Light Comes On and Then Goes Out
    I was able to check your previous invoice and found the T-One Vehicle Wiring Harness with 4-Pole Connector # 118779 for your Jeep Cherokee. It sounds like it is drawing power from your right side wiring harness when it should be pulling power directly from the battery. I recommend checking the power wire, the integrated fuse, and the ground wire connection.
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    The Redarc Tow Pro Liberty Brake Controller, part # RED24FR is compatible with either electric or electric over hydraulic brakes, so it'll work just fine with your trailer. Electric over hydraulic brakes use a brake controller, but on the trailer there's a hydraulic pump that operates the brakes. If your Cherokee has the factory 7-way trailer connector, the only other part you'll need is the # RED67FR plug and play harness. The connector is located to the right of the steering wheel...
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  • Custom 4-Pole Wiring Harness for 2019 Jeep Cherokee
    Curt 4-pole wiring harness # C56406 and the similar Tekonsha # 118779 will work fine on a 2019 Jeep Cherokee with or without the factory tow package being present. Both of these custom-fit kits plug in to the wiring at the tail lights and they will function correctly either way since they are wired independently of any tow package wiring. I recommend the Tekonsha kit because in our experience their wiring products are the most reliable. These harnesses feature a powered tail light converter...
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    The two Curt Class III hitches made for your 2019 Cherokee, parts # C13395 and # C13171, differ primarily in their installed appearance. Hitch # C13171 will install such that its main cross tube is visible under the bumper cover while model # C13395 has a concealed cross tube that is more hidden. If you refer to the two linked photos you can see the difference; the blue vehicle has visible hitch # C13171 and the red one has the concealed hitch # C13395. The difference in weight ratings...
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    The Curt hitch I recommend for your 2020 Jeep Cherokee is the part # C13395. This has plenty of towing capacity for your vehicle at 4,500 lbs trailer weight, is mostly hidden, and has the quickest install time listed of the options that fit your vehicle. I attached a picture and install video for this for you to check out as well. You'll need trailer wiring too so for that I recommend the Tekonsha kit part # 118779 which is going to install easily and comes with a very reliable converter...
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  • Hitch and Trailer Wiring Harness Recommendation for 2020 Jeep Cherokee Latitude
    For your 2020 Cherokee Latitude, I'd recommend going with the Curt # C13395 Class III receiver hitch you'd looked at. The hitch is designed so that the crossbar will be concealed behind the rear bumper, with only the receiver tube and safety chain loops being visible. For a trailer wiring harness, I'd recommend the Tekonsha # 118779 T-One harness. The harness will plug inline using the connectors that attach the taillight assemblies to the vehicle's taillight wiring harnesses. If...
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  • Trailer Hitch and Wiring for a 2019 Jeep Cherokee Trailhawk without Factory Tow Package
    For your 2019 Jeep Cherokee Trailhawk I recommend the Curt Class III trailer hitch # C13395. This trailer hitch has a 2 inch receiver so it is compatible with many accessories. But the best thing about it is that once installed only the receiver is visible. I have included a link to the installation details for you to view. For wiring you can use # 118779 which is designed for models that do not have the factory tow package. This harness will provide you with a 4-Way flat connector at...
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  • Hitch and Wiring for 2019 Jeep Cherokee Latitude Plus
    Curt 2-inch hitch # C13171 is a confirmed fit on the 2019 Jeep Cherokee Latitude and also on the Cherokee Latitude Plus. An installation video showing a 2017 Cherokee is linked for you, along with the written instructions. I checked directly with Curt to confirm this fit. If you also need a 4-pole wiring harness top power trailer lights the correct it is # 118779.
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    The Draw Tite trailer hitch part # 75998 is a confirmed fit for your 2019 Jeep Cherokee Latitude and would be a great choice I recommend. It has a 2 inch opening which means it has great towing capacities at 5,000 lb towing weight and is the size that most hitch accessories are made for. It also has only the hitch opening visible which gives it a more concealed look. See attached picture. For trailer wiring then you'd want then the T-One kit part # 118779 which is a confirmed fit as...
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    Starting with the trailer hitch for your 2020 Jeep Cherokee Latitude Plus, I highly recommend the Curt Class III # C13395 because of its hidden-crosstube design and superior black powder coat finish that lasts longer than those from other manufactures. This Class III hitch also offers the highest tongue weight capacity available for your Jeep and is assembled right here in the USA. The hidden nature of this hitch allows only the 2" receiver to be visible on the Jeep, maintaining a clean,...
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  • Trailer Hitch and Wiring Recommendation for a 2020 Jeep Cherokee Latitude
    I recommend installing the Draw-Tite Max-Frame Trailer Hitch Receiver # 75998 on your 2020 Jeep Cherokee Latitude because it has more of a concealed look than the Curt # C13395 so it looks more like an OEM hitch. Then for wiring I recommend the T-One # 118779 because we have found their wiring to be the most reliable when it comes to the converter box. We actually had the opportunity to install both of these on a 2019 Jeep Cherokee so I have attached both install videos as well as...
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  • Does Curt Hitch C13171 Installation on 2019 Jeep Cherokee Limited Require Cutting Rear Fascia
    We have three 2-inch hitches for the 2019 Jeep Cherokee but one in particular, Curt # C13171, will NOT require trimming of the Limited's rear fascia trim panel. This hitch also installs without drilling on the Limited. I spoke to my technical contact at Curt who confirmed that they just recently did an install of this hitch on your exact vehicle and no permanent modifications are necessary! Apart from bolting the hitch on the only steps required are to temporarily loosen some underbody...
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    We have exactly what you need! The Curt Trailer Hitch Receiver # C13395 is a Class III trailer hitch with a 2" receiver that is designed so that the receiver is the only portion that is visible (see attached picture). Then for wiring I highly recommend the Tekonsha T-One # 118779 as we have found the Tekonsha wiring products to be the most reliable. This tees into connectors behind your taillights and then draws power for the trailer lights directly from the battery on your 2019 Jeep...
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    The Draw-Tite Max-Frame Trailer Hitch Receiver # 75998 is a fit for your 2019 Jeep Cherokee Limited 4x4 with the turbo engine. I've attached the installation details for the fascia trimming required with this installation. I've attached a couple photos to assist. If you will be towing of using a hitch mounted accessory with lights, I recommend the T-One Vehicle Wiring Harness with 4-Pole Connector # 118779 which is also a confirmed fit. If you need a ball mount, I recommend the...
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  • Trailer Hitch and Wiring for a 2019 Jeep Cherokee Trailhawk
    Yes! Curt trailer hitch # C13171 is indeed listed as a fit for your 2010 Jeep Cherokee Trailhawk. I have linked a video showing an example installation for you. This hitch is a great option for a bike rack. The 2 inch receiver will afford you many options if you do not already have a bike rack. If you need a bike rack recommendation just let me know how many bikes you will need to carry. If you do plan on towing in the future I recommend etrailer ball mount kit # 989900. It comes...
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  • Recommended Trailer Hitch For 2019 Jeep Cherokee
    According to my contact at Curt the Curt Class III Receiver Hitch # C13171 will fit the 2019 Jeep Cherokee. This fully welded trailer hitch receiver bolts onto your vehicle's frame with no welding or drilling required. If you do not have a 4-way to control and allow the basic hookup of the three lighting functions (running, turn, and brake lights) if towing a trailer, the T-One Vehicle Wiring Harness with 4-Pole Connector # 118779 is recommended. The T-One connector plugs into your...
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Info for this part was:

Expert Research:
Mike L
Edited by:
Lindsey S
Installed by:
Jeff D
Video by:
Joshua S
Video by:
Michael B
Video Edited:
Jacob T
Video Edited:
Dustin K
Updated by:
Alexander C
Updated by:
Isabelle B
Written by:
Ronnie R
Test Fit:
Shane H
Test Fit:
Ryan G

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