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

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118784
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Custom Fit Vehicle Wiring

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118784 - Powered Converter Tekonsha Trailer Hitch Wiring
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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 - 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 118784 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 Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (252)
  • Q & A (139)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118784

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

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 - no cutting, splicing or tapping required. 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 - 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 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: 2.1 amps per circuit
    • Tail lights: 4 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 interior trim panel in your rear cargo area.


Once installation is complete, the 4-way flat connector will be stowed in an out-of-the-way location within your cargo area.


It is recommended that you use a small amount of grease on all electrical connections - the plug 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.



118784 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118784 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118784

Average Customer Rating:  4.9 out of 5 stars   (252 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 - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

- 118784
by:
2020 Hyundai Santa Fe

I picked the Curt trailer hitch over the etrailer hitch because it sticks out further past the bumper. I have the Thule T2 Pro XL bike rack and wanted to make sure I have enough clearance between the bike rack and the back of my 2020 Hyundai Santa Fe. Even though, your video shows enough clearance (1 1/2 inches ) with the etrailer hitch, with the Thule T2 Pro XL bike rack on the 2020 Santa Fe, I wanted more clearance. With the Curt hitch installed I have 3 inches between the closest point on the bike rack and the back of the SUV. The installation was straightforward and easy. We did use a lift which made it much easier than the previous installation I did laying on the ground under our Honda CR-V. For that SUV I got the etrailer Hitch. I followed the instruction video for the wiring harness, and it was a simple installation.



- 118784
by:
2020 Hyundai Palisade

Looking at the online video showing a similar unit from U-haul...a metal clip that holds 4 way wiring connector was present and made it easier to support the unit. However, the unit I got from etrailer did not contain that clip. If this was a mistake, I would hope that clip is available.


Comments
Hi Chris, Thank you for your review. This wiring harness does not come with a mounting bracket. If you are looking to install one, I would recommend the Mounting Bracket 4-Pole Flat, product 18144. use the self tapping screws to attach it to the plastic bumper or the nuts and bolts to attach to the vehicle frame or metal bumper. If you do not want to screw into the bumper or frame, then I would recommend the 4-Flat Universal Mounting Bracket, product 118149. This one will come with zip ties that will secure the bracket to the hitch.
-- Etrailer Expert Tyler M - 10/07/2020


- 118784
by:
Hyundai

This trailer wiring kit was the exact match for the existing plug and play wiring underneath my 2020 Hyundai Palisade. However, you will need to order a separate bracket available at etrailer also to attach the trailer 4-pin connector plug to either the hitch or bumper fascia. I attached mine to the fascia pictured below.



- 118784
by:
2021 Kia Telluride

I ordered the harness and the hitch for my KIA Telluride. The videos on the site were great and I was able to install the hitch and the harness by myself. Everything works great!



- 118784
by:

Easy to install, wire clip only fit to my SUV one way, no chance of a mistake. Box could contain about 3 long zip ties with the short ones to secure wires to the trailer hitch receiver I installed with this harness but I had some in the tool chest. Seems to be working fine, can pull my Waverunner now.



- 118784
by:
2019 Hyundai Santa Fe

Team etrailer put the icing on the cake with this plug-n-play harness for my 2019 Santa Fe. Thanks!



- 118784
by:

Easier than video of installation. Locate the cars wiring harness, unplug ; then open and plug up new product with one snap, and secure wire line along installed mounted support to flat surface and stick-on square box. Then continue securing wire line on other side of hitch and finally mount any excess wire to hitch while leaving short piece free to serve as connecting 4 post receptor. Over and done with. Thanks for being true to your easy promise



- 118784
by:
2022 Hyundai Palisade

I am very pleased with the quality of the trailer hitch. It seems to be well built with a good, long-lasting finish. It was easy to install. The only hard part was working around the muffler. I recommend this product.



- 118784
by:

The wiring harness worked like a charm. The install videos that etrailer.com have for each of the products I purchased were excellent and really made my work that much easier. Well done



- 118784
by:
2022 Hyundai Santa Fe

Provided the product I needed in a timely manner when I couldn't find a hitch for my 2022 Santa Fe anywhere else. Reasonable price. Perfect fit for my vehicle.



- 118784
by:

Easy to hook up



- 118784
by:

Very simple to install, watch the video instead of the installation paper supplied with harness. I wrapped my wiring around bumper supports as pictured.



- 118784
by:

Great people to deal with always have what you are looking for, this trailer wiring worked perfect,and easy to install. Thanks staff at etrailer.


Comments
Just as good as new
Gordon T - 12/20/2020


- 118784
by:

This harness went in easily, and is still functioning perfectly a year later. 10 of 10 would recommend.



- 118784
by:

I ordered an out of stock item. Their customer service reached out to me immediately and informed me of the extended lead time of the part. They sorted my order out and I received my three item order in three business days. Great customer service. I definitely recommend etrailer.



- 118784
by:

Havent installed anything yet but it showed up at the door all jacked up. I just installed it on my telluride this weekend. Though the instructions were all wet and ruined. I believe everything was still in order though I did not have any missing parts.



- 118784
by:

Installed on customer vehicle easy installation-working well



- 118784
by:
2019 Hyundai Santa Fe

This just arrived. But I know it’s the right one for my 2019 Santa Fe ultimate 2.4. It looks very high quality. Instructions look good. I know it’s easy to install as I already installed the hitch. So this will be a piece of cake. Thanks! Picture is where it attaches to the car harness.



- 118784
by:

Good product at a fair price with great service. Really liked that it connected into factory wiring without splicing any wires. I recommend etrailer.



- 118784
by:

wiring easy to install-directions good would like a solid mount forn 4 pin connector



- 118784
by:
Kia

The hitch and harness for our Kia Telluride were great quality, easy to install and saved me about $700 over having the dealership put the hitch on.



- 118784
by:
2022 Kia Telluride

great wiring harness



- 118784
by:
Hyundai Santa Fe

Plug and play, couldn't be easier. This fit my '22 Santa Fe with no issues.



- 118784
by:

Worked at expected.



- 118784
by:

its working well, howerver the cap for the electrical end does not close with ease. I had to fiddle with it until i could close it.


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Recommended Trailer Wiring Harness for a 2019 Hyundai Santa Fe Without Tow Package
    Yes, the T-One Vehicle Wiring Harness part # 118784 is a fit for all models of the 2019 Hyundai Santa Fe which includes the Sport and those with or without the towing package. The T-One Vehicle Wiring Harness offers plug and play installation as you can see in the attached video. In regards to mounting, you can use the safety chain loops as shown in the attached photo or you can use a more permanent solution with the Mounting Bracket 4-Pole Flat part # 18144 and the No-Drill Mount for Electrical...
    view full answer...
    Image 1 for Image 2 for
  • Comparing the Tekonsha and Curt Trailer Wiring Harnesses for a 2020 Hyundai Palisade
    The trailer wiring harness I recommend for a 2020 Hyundai Palisade is the T-One Vehicle Wiring Harness part # 118784 over the Curt T-Connector Vehicle Wiring Harness part # CU94FR. The main reason for this is that the converter box is physically smaller therefore easier to mount. Furthermore, the T-One Vehicle Wiring Harness has been more reliable than the Curt T-Connector Vehicle Wiring Harness historically speaking.
    view full answer...
  • Adding 7-Way Connector to 2020 Hyundai Palisade
    We definitely have what you need to equip your 2020 Hyundai Palisade with a 7-Way connector, however there isn't a single part number available for this vehicle to accomplish this. You will instead need to start by adding a 4-Way harness (if there's not one already present). For this the Tekonsha T-One Vehicle Wiring Harness # 118784 will work perfectly. This custom harness will plug right into an existing port behind the Palisade's rear bumper on the driver's side. I have attached...
    view full answer...
  • 2020 Hyundai Palisade Trailer Hitch, Wiring and Brake Controller Recommendation
    You are the right rack for towing components for your 2020 Hyundai Palisade! The Curt hitch part # C13427 is a mostly hidden option that has plenty of towing capacity and will work great. For trailer wiring you'd then want to first install the 4-way part # 118784 which is our easiest and most reliable option and then convert it to a 7-way. So the easiest to install brake controller that also works really well is the Curt Echo Mobile part # C51180 that you referenced. Basically this just...
    view full answer...
    Image 1 for
  • Will the T-One Vehicle Wiring Harness # 118784 fit a 2020 Hyundai Palisade?
    Yes, the T-One Vehicle Wiring Harness # 118784 will work for your 2020 Hyundai Palisade with the Curt Hitch # C13427. Check out the video linked below for installation detail on this wiring harness. You can use mounting brackets # 18136 and # 18144 to add a mounting point for your 4-way connector, or you can simple attach it to the safety chain loops on your Curt hitch.
    view full answer...
  • Recommended Brake Controller for a 2020 Kia Telluride
    For your 2020 Kia Telluride you need to start off with the T-One Wiring # 118784 which is the only custom wiring kit currently available and it plugs into a connector under your vehicle on the driver's side. Then for a brake controller I highly recommend using the Curt Echo # C51180 because you adjust the settings with your smart phone via Bluetooth and it can easily be stored in your glove box when not in use. Since this brake controller plugs into the 7-Way at the back of your Telluride...
    view full answer...
  • Wiring for 2020 Hyundai Santa Fe with Factory Trailer Tow Package
    The correct wiring kit for your 2020 Hyundai Santa Fe with the factory tow package is the T-One # 118784. I have attached an installation video of this on a '19 Santa Fe that you can check out. If you'd like to mount the wiring next to your trailer hitch receiver then you also need the Mounting Brackets # 18144 and # 18140 to complete the installation. If you don't already have a trailer hitch then I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 75908 because it already...
    view full answer...
    Image 1 for
  • Recommended Wiring Harness Compatible with 2019 Hyundai Santa Fe Ultimate
    For your 2019 Hyundai Santa Fe the wiring harness you are seeking is the T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118784. You will likely also want the Mounting Bracket 4-Pole Flat # 18144 and depending on your hitch you may want the No-Drill Mount for Electrical Mounting Bracket - Short # 18140 as well. I've attached the installation instructions and a couple of videos to assist.
    view full answer...
  • Recommended Brake Controller and Trailer Wiring for 2020 Kia Telluride
    Let's start off with the trailer wiring for your 2020 Kia Telluride, and to add a 7-way the first thing you will need to begin with a 4-way, and the best, most reliable option for that is the T-One Vehicle Wiring Harness # 118784, which fits your Kia. After that, for a brake controller, I strongly recommend Curt Echo Mobile Trailer Brake Controller # C51180 because it is the easiest brake controller on the market to use and install while giving you continually smooth braking. The...
    view full answer...
  • Do All 2021 Kia Tellurides Have Tow Package for Trailer Wiring Harness
    The 2021 Kia Tellurides all come with the factory tow package port that the T-One Vehicle Wiring Harness part # 118784 plugs into. It does not have to come equipped with the factory tow package per se. It's a direct plug-in fit for all models regardless of options.
    view full answer...
  • Recommended Wiring Harness for 2020 Hyundai Palisade
    You don't need to start with a 7 way, and the Tekonsha # 118784 will provide you with the base of what is needed to eventually tow a trailer with brakes. Once you've got that, you'll be able to add a 7 way fairly easily. To install the 7 way, you'll need to use something like the # ETBC7 (for wired brake controllers) or # ETBC7L (for wireless brake controllers) and you'd have a 7 way connector. These will plug into the Tekonsha # 118784, and after completing the connection to the battery,...
    view full answer...
  • Wiring Kit for a 2020 Hyundai Santa Fe with Factory Tow Package
    We have exactly what you're looking for with the T-One Vehicle Wiring Harness for Factory Tow Package # 118784. This plugs into the OEM connector on your 2020 Hyundai Santa Fe and gives you a 4-Way flat connector that then supplies your trailer with the different light functions. I have attached a video of us installing this on a 2019 Santa Fe that you can reference for the install. If you don't already have a trailer hitch then I recommend using the etrailer.com Trailer Hitch Receiver...
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness for 2020 Hyundai Santa Fe
    For your 2020 Hyundai Santa Fe the best trailer wiring harness is the Tekonsha T-One # 118784 because of its superior converter module that is built to last. This custom harness will plug right into a factory port under your Santa Fe (on the driver's side) to provide you with a 4-Way connector to power a trailer's basic signal lights. I have attached an installation video on the 2019 Santa Fe that you can follow along with.
    view full answer...
  • Trailer Wiring for 2019 Hyundai Santa Fe Without Factory Tow Package
    The Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # 118784 according to the manufacturer fits vehicle without the factory tow package. You can confirm you have the tow wiring harness this connects to by looking under the vehicle behind the rear bumper on the driver's side. I've attached a photo to assist.
    view full answer...
    Image 1 for
  • What is Needed To use the Curt Echo on a 2019 Santa Fe?
    To install the Curt Echo # C51180 on your 2019 Hyundai Santa Fe, you will need to start with a 4 flat harness like the Tekonsha # 118784. Once that is installed, you will need the 7-Way RV Upgrade Kit for Trailer Brake Controller Installation # ETBC7L. This will get the needed power to the # C51180. The only other part I suggest is the # 18136 bracket. This allows for easy installation of the # ETBC7L onto the Curt Hitch # C13195.
    view full answer...
  • How To Add a 5-Way Trailer Connector To a 2020 Hyundai Palisade
    In order to add a 5-way trailer connector to a 2020 Hyundai Palisade you will first need to start with a 4-way, the T-One Vehicle Wiring Harness part # 118784 then you can convert this to a 5-way with the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter part # 20036. The blue wire will need to be spliced into the vehicle's reverse light circuit because this is what triggers the brakes to release so the trailer can reverse. In order to secure the 5-way you will need both part # C58303 and...
    view full answer...
  • 7-Way Trailer Wiring Recommendation for 2021 Hyundai Palisade for Trailer with Surge Brakes
    To install a 7-way on your 2021 Hyundai Palisade with an active reverse light circuit you'll need to first install a 4-way like the part # 118784 and then convert it to a 7-way with the part # 37185. From there you'd need to connect the reverse light circuit wire of the 7-way (purple wire) to the reverse light circuit of the vehicle and you'd be set.
    view full answer...
  • Trailer Wiring Harness Available for 2019 Hyundai Santa Fe
    We do have a wiring harness to fit your 2019 Hyundai Santa Fe. The correct part is # 118784. Since you have the tow package there's a connector under the rear bumper on the driver's side. The harness plugs in here and then you need to find a good secure location to mount the converter box. It mounts with included double sided tape you just need to make sure the location you choose allows for the 4-way connector to reach the connector on the trailer. You also want to make sure the...
    view full answer...
    Image 1 for
  • 2019 Hyundai Santa Fe Trailer Hitch and Wiring Harness
    You can determine if your 2019 Hyundai Santa Fe has the factory tow package either by having a dealership run the car's VIN to check its factory equipment or you can check under the vehicle along the frame on the driver's side to see if you have the mating connector that matches the one shown in the linked photo. If you also need a hitch we offer the USA-made Curt 2-inch model # C13195 which bolts on with included hardware and no drilling is required, as shown in the linked video.
    view full answer...
    Image 1 for
  • Correct Wiring Harness For 2020 Hyundai Santa Fe With Trailer Tow Prep Package
    The wiring harness that you need for the 2020 Hyundai Santa Fe is the Tekonsha T-One Vehicle Wiring Harness for Factory Tow Package part # 118784 which will give you a 4-pole flat on the Santa Fe to illuminate the trailer's lights. This wiring harness will plug into the factory tow package behind the rear bumper. I have attached a video for your reference.
    view full answer...
  • Trailer Brake Controller Recommendation for 2019 Hyundai Santa Fe
    Your 2019 Hyundai Santa Fe does not have a brake controller built into it so you'd need to install one with the trailer wiring harness part # 118784 that you mentioned. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. The video shows a controller installed in...
    view full answer...
  • Parts Needed to Install a 5-Way on a 2020 Kia Telluride
    To install a 5-way on your 2020 Kia Telluride the first thing you need to install is the 4-way kit part # 118784 which install easily to a port on our vehicle and then install the # 20036 to convert it to a 5-way and you'd be set. This requires tapping into the reverse light circuit of your tow vehicle. I attached an install video for this for you to check out as well.
    view full answer...
  • Recommended Trailer Wiring Harness for 2019 Hyundai Santa Fe
    For your 2019 Hyundai Santa Fe I highly recommend the Tekonsha T-One Vehicle Wiring Harness # 118784. This custom harness is designed specifically for your vehicle and it will plug right into a factory port behind the rear bumper (on the driver's side) for a complete plug-and-play installation. It will provide you with a 4-Way connector to connect with and power a trailer's basic signal lights. Tekonsha is well known for making extremely reliable and long lasting electrical harnesses. I...
    view full answer...
    Image 1 for
  • Correct Trailer Wiring Harness for 2020 Hyundai Santa Fe with Factory Tow Package
    For your 2020 Hyundai Santa Fe that's equipped with the factory tow package, the correct (and best) trailer wiring harness is the Tekonsha T-One # 118784. This custom harness is going to plug right into that factory tow port beneath the vehicle, on the driver's side (see attached image). That's the only connection you will need to make and you'll have a reliable 4-Way connector at the bumper to connect with and power your trailer's basic signal lights. I have attached an installation...
    view full answer...
    Image 1 for
  • Correct Wiring Kit for a 2019 Hyundai Santa Fe with the Trailer Tow Prep Package
    If your 2019 Hyundai Santa Fe has the tow package then you want to use the Tekonsha T-One # 118784 which has the 4-Way Flat connector that you asked about and plugs into the factory connector which is located under the vehicle, behind the rear bumper, on the driver’s side. You said that you already have the trailer hitch for towing but you didn't mention a ball mount kit. If your trailer hitch has a 2" receiver like the Curt # C13195 which fits a 2019 Santa Fe then I recommend the Curt...
    view full answer...
    Image 1 for

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Info for this part was:

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