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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118384
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Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118384
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Quickly and easily install a 4-way trailer connector on your vehicle. This T-One typically plugs directly into the back of your factory-installed 7-way connector so you can retain the 7-way and also pull a trailer that has a 4-pole flat. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118384 or order online at 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.
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  • Reviews (392)
  • Q & A (0)
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Tekonsha Custom Fit Vehicle Wiring - 118384

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle. This T-One typically plugs directly into the back of your factory-installed 7-way connector so you can retain the 7-way and also pull a trailer that has a 4-pole flat.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Retains functionality of factory-installed 7-way, RV-style connector (if present)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage: 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 rear bumper. If you have a factory-installed 7-way, blade-style connector, the T-One will plug in between the 7-way and the OEM socket.

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.

118384 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118384 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 - 118384

Average Customer Rating:  4.8 out of 5 stars   (392 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle. This T-One typically plugs directly into the back of your factory-installed 7-way connector so you can retain the 7-way and also pull a trailer that has a 4-pole flat.


Straight forward install. Works as inte nded.


This wiring harness fit good, was easy to install and the price was not to bad.


Slow start to a good impression but everything worked out.
1. It started with a delivery delay; I live two hours from the manufacturer but it took 3 weeks to get me my harness. When the error was found they over-nighted the harness to me.
2. The wiring in the harness was loose and would lose connection, disabling the lights. Pushing a connector back in to place, crimping it down and wrapping it in electrical tape solved that issue.
That was a month into owning the harness. It's been a year now and I've had no problems. I'm pleased with the compatibility and ease of which it took to install.

2012 Toyota Tundra

I have a 2012 Toyota Tundra and I recently bought a pre-owned Leer camper shell. I used this harness to wire up the third brake light. I also used the brake light module. This setup worked perfectly and resulted in a neat and clean professional installation. Thanks etrailer, you had everything I needed for a successful prefect installation.

2012 Jeep Liberty

Parts came as described. Impressed with the weight of the hitch. It was well built.


Makes for cleaner installation of tailgate light bar.


The box might fool you. If you wanted the harness for a jeep it is not listed on the box and the box photo shows a power converter. Actually in the box as pictured or it would be 5 stars. Making me double check the pn was compatible back on etrailer site. Installed as per website no issues there.


Perrrrfect literally Less than 10 minutes for a complete install. Perfect fit

2013 GMC Sierra

Have been looking for a T-connector for my trailer lights for two years. Truck has a seven pin connector built-in. Wanted my GMC emblem to light up when the breaks are applied. Was getting ready to cut and splice wires when I looked on the internet and learned about Found the T-connector I needed. Took 5 days to arrive after ordering, and 5 minutes to install. Works great !


Great product as advertised. Plugged right in wire and loom plenty long . Highly recommend

2013 Toyota Tacoma

Does not fit vehicle as described on web age. Charge for shipping to return item. As the problem is their poor match up of product and vehicles the charge for returning items should be paid by them. Basically false advertising! DO NOT TRUSS etrailer. Go somewhere else.

Some vehicles have a factory connector that will not come apart for this product to plug into, so the connector ends have to be cut off and hardwired together. We mention this in the tech tips when going through the fitguide.
-- Etrailer Expert Sierra K - 05/11/2022


trailer hitch went on very easy and plug was just as good


Doesn't fit 2012 Toyota Tacoma

You mentioned that it did not fit the Tacoma. I wanted to see if you could explain in more detail how that it didnt. Did your Tacoma come with the factory seven way?
-- Etrailer Expert Jenny N - 07/21/2022
Thanks for responding. I have a 2012 Toyota Tacoma 2 - door, 4wd. I dont see a factory 7 way. The box doesnt list a Toyota.
-- comment by: Lynn - 07/26/2022
The 118384 harness does fit a variety of vehicles, mostly trucks, that have seven ways already installed and it will not list every fit on the box.. It is meant to plug in line with the US Carr connectors in the seven way to provide the 4 way. If a four flat is all that you need then I recommend part # C55513 for your 2012 Toyota Tacoma instead. I will have our customer service team email you return instructions.
-- Etrailer Expert Jenny N - 07/26/2022



2004 Chevrolet Colorado

Do not use etrailers link for recommended harnesses when buying a hitch. Did not fit, and was for a vehicle if it already was equipped with a wire harness, why would you by a T wire harness if you already had a harness? The only recommendation that came up. Now they are trying to make money on the return. Use [online] instead, less hassle, faster and better.


On my part I ordered the wrong wiring harness, was returned and replaced with the one I want with ease. Very happy with purchase


Like this wiring harness so there’s no cutting no splicing everything stays OEM and it cuts installation time

2009 Jeep Liberty

The hitch is very good, fit like a glove, BUT, the electrical connecter doesn't fit anything. The fine print on the directions says for a factory wired vehicle to add on a 4 pin connecter. My 09 Jeep Liberty was not factory wired so I'm out the money I paid for it. Thanks.

If you do not have a factory 7 way you will need this kit first: Item # 118554
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
-- Etrailer Expert Sierra K - 10/06/2021

2016 Jeep Grand Cherokee

Purchased this hitch for my new 2016 Jeep Grand Cherokee Laredo online after being quoted a $700 installation price at my local Chrysler Dealership. After doing some online searching and reading multiple reviews I decided to give these folks a try. My husband and I watched a very detailed video explaining 3 different hitch options for my Jeep and quickly decided for the price it was worth giving it a try. From opening box to install was less than 20 minutes that included connecting trailer light kit that I purchased extra $$.$$. You can barely see it under my JEEP. I'm very pleased and can't hardly wait to use it. Thanks again you helped me prove my to my husband that it would work and saved me $600!


Worked as expected. 3,000 miles on the trailer and no problem.

The wiring harness fit perfectly and the installation was a breeze. I haven had any problems at all with this product and I reccomend it to anyone.
Casey H - 02/22/2022


This does not fit my vehicle 2009 Toyota Tacoma. But your site said it did

This Tekonsha wiring harness does fit the 2009 Toyota Tacoma with a towing package. The plug that you plug the wiring harness into is located underneath the bumper on the drivers side of the Tacoma. If your Tacoma does not have a towing package, you will need part # 118496
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
which is designed for a Tacoma without the towing package.
-- Etrailer Expert Heather A - 03/08/2022


Exactly what I needed. Easy to order and deli ery was prompt.

2014 Jeep Grand Cherokee

Bought a trailer hitch, and wiring harness for my 2014 Jeep Grand Cherokee. etrailer was fantastic, right on the money with the videos and it was very helpful in choosing the right hitch. Very easy to install.


Search hi and low to find what I needed or even for someone who even understood what I needed. I had no luck until I search on They had exactly what I was looking for. Ordering was simple and delivery was quick. They even check in with me before durning and after shipping. I love this site. I'll definitely shop here first next time.

2016 Jeep Grand Cherokee

I purchased a trailer hitch (C13182) and wiring adaptor (T-One 118384) for my 2016 Grand Cherokee. Received it within a few days and fit was perfect! Only took all of ten minutes to install with the help of my 5 year old. Thank You!

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