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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  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 # 118813
Our Price: $81.62
You Save: 16%
Custom Fit Vehicle Wiring

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Shipping Weight: 1.72 lbs
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Tekonsha Custom Fit Vehicle Wiring - 118813
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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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118813 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (45)
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Tekonsha Custom Fit Vehicle Wiring - 118813

  • 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. 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 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


  • 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 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 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.

118813 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118813 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118813

Average Customer Rating:  4.6 out of 5 stars   (45 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.


It works but unless you are a mechanic or have the ability to use a lift for the car it's not a quick job. It requires a lot of work to get it though the front fender. The driver side light cable should be longer to make it easier to be able to mount the transformer box. Currently mine is just sitting in my bumper unattached


Easy install… took about 10 minutes. No need to lower the exhaust


The product works. It connects like it should. Time will term if it will last. If anyone from etrailer was interested in a suggestion that has value, I recommend changing the wiring at the connecting ends for the tail lights. I recommend that the wire be fixed in an already bent shape to help us with successful installation. What this solves is when installing, we have to click those connectors into the tail lights and then the wire has to be bent to the side so that the tail light fits back in. That's chastising and can easily result in bad connections. But if the bend is done from the factory, that would help us.


Everything went just the way it should.
Excellent flawless product.
Videos explain everything to a Tee.
No problem hooking it up...

2021 Kia Soul

It's a well made product. The reason for 4 stars instead of 5 is the instructions or really a lack of instructions. But as far as the product goes I give it a 5 star.



After a year I have probably used it a total of 20+ times and it has performed just as well as when we first installed it. No complaints at this point.

2022 Kia Soul

The wire on the left side is about 2 foot short the same as my 2020 Soul. With these new lights on the 2022 Soul there is no room to run them with out cutting wires. Some body need to try and install a wire harness on a real 2022 and make a video


Not terribly difficult to install for me(not a mechanic). One thing that held me up was that I ran short by about 6 inches of wire to get to the connector on the passenger side lights(getting it high enough to reinstall the light fixture). Took a while to rerun the wires several times and then ended up moving the ground screw lower by about 5 inches. I ran the power black line along braking components and then fished it under the black cover that runs most of the way to the front and right up to the battery, I’ve never tied something to a car battery and it all worked out well. I used a 4 foot bamboo stake to run it both under the blastocyst shield in the bottom of the car and up to the battery. 6 inches of extra wire to get to the passenger side and I would have had this done in about 30 minutes.

Tips. A flat head screw driver will easily remove the plastic clips for extra room

I also used a flat head screwdriver wrapped in a paper towel to help the light fixtures out- there are 4 screws and 4 rubber push in pins on the outside- I put it between the light and car and gently popped it out.


Kit was not manufactured for proper install. I had to cut harness wiring to the right rear light, and make it 14 inches longer. The extra wire that feed the power is also a joke. The whole design could of been better. The surge box should have been installed under the bumper. I tucked it in and tied it. Putting it a long with the ground behind the light is just plain stupid. (Limited Space) I believe Curt kit is superior but also could use a better design for install. This was a nightmare to deal with. And having to modify for install was poor manufacturing to save a dime.. I just hope when I test the system today; That it all functions as it should. I know I voided the warranty fixing their cheap build.

Etrailer Expert

Sierra K.


When you follow step 7 in the installation instructions, it mentions to either route the black power wire through a grommet along the exterior frame or follow the existing wiring along the thresholds into the engine compartment up to the battery, avoiding areas that may pinch or break the wire. By following the picture labeled C in the instructions, you should not have to add additional wire to make this kit work.

2023 Kia Soul

Arrived ahead of schedule and fit perfe ctly

2023 Kia Soul

Very easy with some time. Great quality!

2012 Kia Soul

Delivery was on time thank you it is for my 2021kia soul. Made for 2020 to present. Kia must of changed wire harness 2021 colors. Didn't match instructions.i figured it out and 12 volt to the battery to took some doing average person would have a hard time

2020 Kia Soul

All in all pleased. All of the wiring and module is located outside the vehicle compartment underneath the bumper facia. The wiring lengths are just right, long enough but no extra slack. With two experienced people, a lift, and all the right tools at hand; it took three hours to install the hitch and the wiring harness. The instructions that were supplied with the harness were minimal, almost useless.


Worked out great and this particular wiring harness kept the car’s warranty intact.


Prefect fit, everything you need, easy wiring harness
Great quality

Kia Soul

It was really easy to install! I only really had to run one wire from the battery to the rear of the car. The rest of the wiring was simple plug and play. A ground point was easy to find in the Kia Soul in the hatch back section directly below the hatch lock mechanism behind the interior panel. So no need to drill a hole.

Kia Soul

Installed on my 2021 Kia Soul in half an hour, hardest part was snaking the ground wire from the rear to the battery.... car lamps came out easily, connectors snaked very easily & all fit great.

2020 Kia Soul

The product trailer hitch was a good fit for my Kia Soul. Running a wire to the front of the car proved difficult without having a lift, but the turn signal and brake lights are working.


Installed this product and have traveled pulling a pop up camper. I haven't had any issues with this product. Has never let me down.

2020 Kia Soul

The wire on the drivers side was about 2ft to short and had to add, ont the other side it was the right . You may want to look into this, other then the short wire it all went together pretty smooth.

Thomas T.



2020 Kia Soul

Left side wiring needs to be about 6" longer to mount control box to body. However, it is installed and works properly. This is the 6th unit Ive installed since 2013.


Fairly easy to install, my only complaint would be that the wires are too short after mounting box.


Sadly the part supplied to me was not perfectly fitted to my vehicle. Most sections worked but had to add wire to the cross tail light section. That said, once installed it is functioning properly

2020 Kia Soul

I haven't had time to have it installed on my 2020 Kia soul. I will let you know more once this process has been completed. Looked it over and looks like just what I need. Will keep your site on my computer and use it for next purchase for my car;s electrical items.


Everytime I order from etrailer, my orders come thru without no "hitches"... ;)

Perfect everytime!

2021 Kia Soul

Very very good

Show More Reviews

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

  • Recommended Trailer Wiring Harness for a 2020 Kia Soul LX
    The 2020 Kia Soul LX is not offered with LED rear tail lights so you can use the T-One Vehicle Wiring Harness part # 118813 which is a direct plug-n-play option with no cutting or splicing required. It will provide you with all the functions needed for most smaller trailers.
    view full answer...
  • What 4-Way Wiring Harness do I Need for My 2022 Kia Soul without LED Tail Lights?
    For your 2022 Kia Soul with non-LEDs, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118813. This 4-way comes with a ModuLite converter that ensures that your vehicle's wiring matches that of your trailer. If you plan on towing a small trailer with your Soul, also recommend a ball mount/ball like the ones included in the Curt Towing Starter Kit # C45534. This kit also comes with a hitch cover and a locking hitch pin. The kit is also 100% manufactured...
    view full answer...
  • Recommended Trailer Hitch For A 2022 Kia Soul
    For your 2022 Kia Soul, I recommend the Curt Class I Hitch # C67FR, which does have the smaller 1-1/4" receiver opening you need. This is a direct bolt on application that requires no drilling for the install. This is assembled in American and is rated up to 2,000 pounds towing and 200 pounds of tongue weight, though you will need to check your owner's manual for your vehicle's max capacities. I can also confirm that the Tekonsha T-One Vehicle Wiring Harness # 118813 will fit your Kia...
    view full answer...
  • What 4-Way Wiring Harness and Hitch do You Recommend for a 2022 Kia Soul without LED Lights?
    For a non-LED 2022 Kia Soul, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118813. We have tested this harness specifically with your non-LED lights and it will provide you with a clean signal for your brake lights, turn signals, and running lights. If you need a hitch for your vehicle, I recommend the Curt Hitch - 1-1/4" # C67FR. The Curt hitch has a gloss outer coat over the base powder coat to provide you with superior resistance against rust and...
    view full answer...
  • Recommended Wiring Harness For A 2024 Kia Soul Without LED Lights
    You are correct that both the Curt # C89KR and Tekonsha # 118813 are going to fit your 2024 Kia Soul without LED lights. Both products are going to be virtually identical. You are looking at two different manufacturers version of the same custom fit wiring harness. If it were my car, I would go with the Tekonsha # 118813. The Tekonsha products are known to be superior as far as durability and longevity, so this is what I recommend.
    view full answer...
  • What Trailer Wiring Kit Do You Recommend for My 2022 Kia Soul without LED Lights?
    If you do not have LED lights on your 2022 Kia Soul, you will need a specific 4-way wiring kit for that. If you need just brake lights/signal lights alone, you will only need the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118813. The T-One includes a ModuLite power converter to ensure that your vehicle's wiring matches that of your trailer. If you are looking to add a brake controller to the trailer, you will need the Universal Installation Kit for Trailer Brake Controller...
    view full answer...
  • Does The Vehicle Wiring LED/non-LED Option For 2022 Kia Soul Reflect The Trailer Or Vehicle Lights?
    It is in reference to the vehicle tail lights on your 2022 Kia Soul. The T-One Vehicle Wiring Harness # 118813 is for models with incandescent tail lights. We have the Curt T-Connector Vehicle Wiring Harness # C89KR which will fit models with LED or incandescent tail lights.
    view full answer...
  • Trailer Wiring Kit for 2022 Kia Soul Without LED Tail Lights
    Thank you for all of that info! In order to utilize a light kit for your cargo carrier, I recommend using the Tekonsha T-One # 118813. This is designed to work with the Soul models that don't have the LED tail lights and the Tekonsha wiring is the most reliable that we have. I also recommend picking up brackets # 18144 and # 18140 as well as a gasket maker # LT37467 so that you can install the 4-Way connector near your hitch receiver. If you don't already have a trailer hitch then the...
    view full answer...
  • Recommended Trailer Hitch Receiver For A 2020 Kia Soul
    According to Curt's fitment chart the Curt Trailer Hitch Receiver # C67FR would fit your 2020 Kia Soul GT as long as it isn't the 1.6L engine. Since this trailer hitch is only a 1-1/4" receiver you're limited to 2,000lbs gross tow capacity and 200lbs tongue weight capacity. I've attached our help article below that will walk you through choosing the correct ball mount rise/drop so that the trailer can ride level while towing. I've also attached a link to all of the ball mounts we currently...
    view full answer...

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

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Lindsey S
Edited by:
Lindsey S
Employee Kathleen M
Installed by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Written by:
Alexander C

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