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  1. Custom Fit Vehicle Wiring
  2. Kia
  3. Niro
  4. 2019
  5. Tekonsha
FITS 2019 Kia Niro
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Part Number: 118749
In Stock
You Save: 29%
Custom Fit Vehicle Wiring
Confirmed to Fit
2019 Kia Niro

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118749 - 4 Flat Tekonsha Custom Fit Vehicle Wiring
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Tekonsha custom fit vehicle wiring for your 2019 Kia Niro are available from Installation instructions and reviews for your Kia custom fit vehicle wiring. Expert service, and great custom fit vehicle wiring prices. carries a complete line of Tekonsha products. Order your T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part number 118749 online at or call 1-800-940-8924 for expert service.
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  • Reviews (37)
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2019 Kia Niro - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Quickly and easily install a 4-way trailer connector on your Kia Niro 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 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 in rear cargo area
    • 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: 4.2 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 inside your rear cargo area. You will have to remove the cargo door and some interior paneling to access this harness. 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 in your rear cargo area.

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.

118749 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118749 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118749

Average Customer Rating:  4.6 out of 5 stars   (37 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.


Just received my Curt trailer hitch, and there are two areas that have bifocals paint blemishes, including an area that is exposed metal. I will update my review if customer services comes through and makes it right.



Replacement hitch was sent, install was tough, but everything went great.

Etrailer Expert

Mike L.


@Chris We're glad you were able to complete your install!


My trailer wiring harness for a 2022 Kia Niro EV arrived quickly and, after reading the instructions, I decided to have a local shop install it. The instructions were clear, but I didn't feel up to the task of running the 12V positive lead myself. The results are great with the harness connector being tucked in under the rear cargo area when not in use. When ready to use, the long wiring lead is sufficient to reach the trailer with extra slack if needed. The wires are held in place by the rear hatch rubber gasket without getting pinched. Everything works as advertised and I had a chance to tow my Zero SR/S motorcycle on a friend's utility trailer. I've also used U-Haul trailers and the lights all worked as they should.


It was supposed to be plug and play I had to splice into the car wiring harness


Have bought several notches and one wiring harness from etrailer, all were easy to install and have worked very well! Instructions are simple and they tell you up front the estimated time and difficulty level of installation. Prices are great too!


The package shipment was very efficient and the contents were exactly as described. The instructions provided were precise for my vehicle and easy to follow, and installation went perfectly. Initially my car dealer advised against wiring up a hitch on my KIA Niro for a light trailer, but when I showed them the photos and description of the custom etrailer harness, they were impressed and approved installation. Everything works just as hoped for to hook up my new kayak trailer. Thanks etrailer for a great product!


The hitch and wiring harness seem like great quality. I did not install and have sold my Kia Niro. Mow I have to sell my brand new hitch and wiring harness.



Sold my vehicle so I have a new hitch and wiring harness for sale.


Installation is not for the faint of heart -even after finding the how-to video. Routing the provided power cable from the back to the front of the car, through the engine compartment and to the fuse block proved to be very challenging.


Installed on my 2022KIA Niro, which was not supposed to have a trailer hitch at all (electric) and it worked perfectly

2017 KiaNiro

I followed the video and proceeded with install on the 17 Nero. I was worried it would be too much for me. Not an issue… all work I did was on my back without jacking up the car. Total job literally took me an hour sand a half. Instructions were ample and precise. It was a great buy

2022 KiaNiro

This was very easy to install, and works perfectly. I installed mine on the PHEV model, and it was much easier than the standard model since the 12V battery is actually in the back next to the passenger side blinker, so I was able to run the power wire beside the right blinker wire, and never had to run a wire to the front. The whole installation took me less than an hour, and I have no experience.

2018 KiaNiro

Even though this item isn't supposed to be compatible with the PHEV Niro, it does actually work with it. In fact, installation is a little easier than with the regular hybrid because you can bolt the power cord to the 12v battery in the luggage compartment instead of running it up to the front. If you're a little handy you can figure it out but other than that one bit the installation video is the same for the PHEV. I use this with the Curt 2-inch hitch for the Niro, which I had to modify slightly to fit the PHEV (had to take out a small notch on one flange with an angle grinder in order to clear a bit of frame support that I guess the regular hybrid doesn't have). As always, etrailer is a great company to work with.


Followed the video. worked like a charm on first try.
Work well with Kia Niro PHEV 2021


Install Video online was spot on. After plugging in via flat 4 to 7 pin adapter it did not work. Wife turned off her car and restarted and it then started working. I added a wireless camera to the license plate bracket tapped the running lights and all is good ATT . I can recommend it but took 1 star off for the false start. Whether it was a connector issue or controller needed rebooted is unknown but I do have lights working on my camper and the camera is great since the Pup blocks sight lines of cars behind (wider/higher than my wife's Niro's mirrors ). Not now clear view behind trailer.

2022 KiaNiro

Super easy installation!


Easy to follow instructions. Works wel l.

2023 KiaNiro

Plan on spending a fair amount of time installing the power source under the vehicle.

2017 KiaNiro

great quality and very good detailed video for installation


i haven't had a chance to install them but everything looks of good quality and expect them to perform good like past parts purchased from etrailer.


Appears to be products as ordered


Works great
Installed on Kia Niro EV

Install was a bit of work but it works just fine


Perfect fit on Niro PHEV SX 2020
fine, i'm completed satisf


Customer service was excellent received product as described in a timely fashion easy to talk to and good follow up communication




I have used it several times and it gets the job done!


15min to install. Easiest hitch I have ever done


Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

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  • Parts Needed For Carrying Bikes Behind a 2019 Kia Niro Plug In Hybrid
    The Curt Trailer Hitch Receiver # C12171 is a class II receiver which we have received reviews on stating it will fit the plug in hybrid version of the 2019 Kia Niro. Be sure to also install the T-One Vehicle Wiring Harness # 118749 so you will be able to use Auxiliary Lights # C53201 with your Bike Rack # TH903202.
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  • Will the Curt Trailer Hitch Receiver Fit a 2018 Kia Niro Hybrid
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  • Will The Tekonsha T-One Vehicle 4-Way Wiring Harness # 118749 Fit a 2021 Kia Niro PHEV
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    The wiring harness fits we have for the 2018 Kia Niro, which include Curt part # C56376 and Tekonsha part # 118749 that you purchased, specifically exclude fitment on the plug-in hybrid version of the car. You'll see this notice on the linked page. If you have the plug-in hybrid we do not have a trailer wiring harness for it. I did check with my technical contact at Curt about installing wiring in your vehicle. He said that a Niro plug-in hybrid owner has reported using a 12V circuit for...
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  • Trailer Connector Testes Fine But Trailer Lights Dont Work
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video by:
Joshua S
Employee Jacob H
Video by:
Jacob H
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C
Employee Shane H
Test Fit:
Shane H
Employee Ryan G
Test Fit:
Ryan G

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