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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 # 118674
Our Price: $65.72
You Save: 42%
Custom Fit Vehicle Wiring

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118674 - 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. Powered ModuLite reduces strain on wiring system. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118674 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.
  • All Info
  • Reviews (24)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118674

  • 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 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: 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 in your rear cargo area on both the driver's side and the passenger's side. You will have to remove the interior trim panels 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.

118674 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118674 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 - 118674

Average Customer Rating:  4.8 out of 5 stars   (24 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.

2015 Ford Focus

This is my third hitch purchase from Etrailer, and they always have the best price. I do not like driving a pickup so I use a small 4x8 utility trailer behind my cars when I need to haul something big. I prefer a hitch that is as close to hidden as possible, and this one comes close - don't think they could have done much better given the muffler in the way. I also prefer a hitch that bolts only to the frame rails, and this one did just that. Took under an hour for the hitch install and another hour plus for the wiring install. Plenty of room to work under my 2015 focus hatchback for install of this hitch. Everything bolted up as designed, and there were no surprises. I did not cut the heat shield for the hitch install because I didn't want to leave it hanging - I will check the bolts a few times a year to make sure they don't back out. I found installing the carriage bolts first to be easiest, then installing the 4 other bolts. Torqued everything to specs and it looks great. I included several pics to show how much of the hitch shows and how far it sticks out from different angles (my primary concern before purchase). Always great communication from Etrailer and great instructional videos. A+ service and support!


Easy install...very easy...almost too e asy.


Loved the hitch. It does exact what I need it to do without fail. Customer service was fantastic. Both etrailer and I made mistakes during the transaction and they fixed everything above and beyond. I would recommend them to anyone

2018 Ford Focus

James was super helpful with my selection of this wiring harness for my new 2018 Ford Focus Titanium hatch back. The video on etrailer's site was awesome. The installation to the existing wiring was easy and straight forward. No cutting of factory wires necessary. The hardest part was running the power from the back to the battery in the front - but with a couple of ramps, plenty of access under the car to run and secure the wire underneath and right up to the battery. Pretty happy so far.

2015 Ford Focus

Easy Install If you follow directions and have the write tools, Its been about a month since I installed the trailer hitch and about two weeks for the harness and so far all is well.


Hitch and lights plus roof-rack for Kayak
Thank you for a great job working on my car.
I have used the kayak rack a dozen times. I have sent several of my friends to you for exactly the same great products and service.
Thank you so much

2015 Ford Focus

I am very pleased with the product, ease of installation and instruction video. The delivery was good with no damage. I will be pulling a 4 x 8 [kit trailer]. Thanks for every thing.


fast and friendly service,received part faster than expected


The wiring works as it should. Mostly plug and play which is nice. Instructions are a little confusing but videos are available online.

2016 Ford Focus

Excelente todo empacado como debería estar, fue fácil la instalación a pesar de que no tengo las herramientas para hacerlo, gracias

Excellent everything packed as it should be, the installation was easy even though I do not have the tools to do it, thanks


Great company great products. They feel more personalized then most companies I’ve worked with


Plug and play. Made wiring a breeze

Ford Focus

Works great, used for my focus RS no problems.

Still works great. Used it for a small John boat trailer and utility trailer.
Chris B - 04/03/2020

2018 Ford Focus

Very easy install.

Les H - 09/12/2019

2015 Ford Focus

Great product, pretty thoughtless install. Hardest part was running the power line to the front of the car.

2016 Ford Focus

Wiring was simple and easy to intall. Did it in minutes! So far its worked without any issue.


Wow that was very quick turnaround! I'm beyond pleased with the amazing& outgoing customer service you guys have been providing! I will highly recommend and continue to do business.

2016 Ford Focus

Great prices, professional service, and quick order processing and delivery.

2016 Ford Focus

Works great.


Great product! Easy to imstall and works great! Glad I bought this product and I recommend it!

Suzuki Swift

Great product, swift delivery, easy ins tall.



just what i needed!!

2017 Ford Focus


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

  • Trailer Wiring Harness Recommendation for 2016 Ford Focus ST Hatchback
    The trailer wiring harness you need for your 2016 Ford Focus ST is the part # 118674 which is confirmed to fit all models of the 2016 Focus hatchback like what you have.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2015 Ford Focus Hatchback
    For the hatchback models of the 2015 Ford Focus the correct trailer wiring harness would be the Tekonsha harness part # 118674 which has been listed as a fit.
    view full answer...
  • Trailer Wiring Harness for a 2017 Ford Focus Hatchback
    The trailer wiring harness shown for the 2017 Ford Focus hatchback is # 118674. However I did find in one manufacturer fit guide that # 118549 will fit despite being listed up to 2014 models only in many other fit guides. Based on several fit guides and other information it would seem that # 118674 is correct. It is a 6-pin set up though the connectors are more like rounded squares.
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  • Trailer Wiring Harness for 2016 Ford Focus Sedan
    Curt 4-pole wiring harness # C56138 is the correct part for the 2016 Ford Focus Sedan and will provide basic trailer lighting functions. If you have the hatchback version then instead use part # 118674. Both plug in at your tail lights as shown in the linked video. El arnés de cables de 4 polos Curt # C56138 es la pieza correcta para el Ford Focus Sedan 2016 y proporcionará las funciones básicas de iluminación del remolque. Si tiene la versión hatchback, utilice la pieza n. ° 118674. Ambas...
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  • Losing Power Of Curt Custom Wiring Harness # 118674 On My 2016 Ford Focus
    There isn't a reset switch on your T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118674. If you aren't getting any power, you will want to check the in line fuse first. If that is still good, you will want to check the connection at the battery for any issues like corrosion or noticable wire damage. If there is any damage you'll want to replace the wire. If there is still no power at the unit, use a circuit tester, like # PTW2993 to check individual functions. ...
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  • Trailer Wiring Harness Recommendation for 2017 Ford Focus ST and 2004 Nissan 350Z
    For your 2017 Ford Focus ST hatchback the easiest to install trailer wiring harness is the part # 118674. This is a custom install kit whereas for the 2004 Nissan 350Z the wiring harness you'd want is the # C59236 which is a hardwire option but it's the only option that fits your vehicle. Since not a lot of people tow with the 350Z there hasn't been enough of a demand to create a custom wiring harness for it.
    view full answer...
  • Recommended Trailer Wiring Harness for 2016 Ford Focus ST Hatchback
    For your 2016 Ford Focus ST hatchback the trailer wiring harness I recommend is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118674. Tekonsha makes the most reliable trailer wiring harnesses in the industry, and this one has the highest amp rating for your vehicle, so it gives you the best prevention against potential shorts. I have added a link to a video install of this harness for you to check out as well. Additionally, if you need a hitch there is one that...
    view full answer...
  • Can Towing and Flat Towing Harness be Combined on 2018 Ford Focus?
    No, you would not be able to somehow combine the two wiring harnesses to use with your 2018 Ford Focus, they are for separate applications and need to be treated as such. Wiring Harness # 118674 will be what you need to install for a 4-flat to tow with hitch # 24872 and Roadmaster Wiring Kit # RM-154 should be installed for flat towing, but there cannot and should not be a combination of the two.
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  • Recommended Hitch Receiver And Towing Components for 2016 Ford Focus SE Hatchback
    The Draw-Tite Sportframe Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # 24872 is a confirmed fit for your 2016 Ford Focus SE hatchback. You will also need the ball mount # 3593 and a hitch ball like # 19258 for a 2 inch diameter or # 19256 for a 1-7/8 inch diameter to match your trailer coupler. For your trailer wiring, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118674 confirmed to fit your hatchback. This wiring connects to your factory...
    view full answer...
  • Trailer Hitch and Wiring Recommendations for a 2015 Ford Focus SE Hatchback
    Both the Draw-Tite trailer hitch # 24872 and Curt hitch # C11158 will fit the 2015 Ford Focus SE Hatchback. The hitches are designed for and tested on stock vehicles so if you have aftermarket exhaust like in the picture you sent or a body kit then we can't guarantee fit. But exhaust mods are easier to work around so I would not be concerned about fit. I have linked videos showing example installations of these hitches (they also fit sedan models) so you can see how they install. Between...
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring Recommendation for 2018 Ford Focus ST Hatchback
    The trailer hitch I recommend for your 2018 Ford Focus ST hatchback is the Curt Class I part # C11431 which is a confirmed fit and would work well. Currently it's the only option we have for your vehicle but it's a great USA made trailer hitch that will work well for you. For trailer wiring the best option is the Tekonsha kit part # 118674 as it is the most reliable harness we offer. I attached an install video for this for you to check out as well. For a ball mount you'd want the part...
    view full answer...
  • Trailer Hitch Recommendation for 2016 Ford Focus ST Hatchback
    For your 2016 Ford Focus ST the Curt hitch part # C11431 is the correct fit. It has towing capacities of up to 2,000 lbs which would potentially be enough for your ATV/motorcycle trailer. You'd need to also verify that your vehicle has the towing capacity as well and you'd be good. For trailer wiring you'd then also need the # 118674 and for a ball mount # C45521. For a 2 inch ball you'd then want the part # A-82 and for a 1-7/8 inch ball part # A-80.
    view full answer...
  • Torque Value of Install Bolts for Hitch on 2016 Ford Focus Hatchback
    The Draw-Tite # 75270 is a fit for a Honda Odyssey, and wouldn't fit your 2016 Ford Focus hatchback. We don't publish the torque numbers because they can change over time, but the installation instructions for the hitches mentioned below are linked for you, and each install sheet does clearly list the torque values. The hitch you need will depend on which sub-model Focus you have. For the RS, I'd recommend the Curt # C11489. For the S ,SE or Titanium model, I'd go with a concealed crossbar...
    view full answer...
  • Trailer Hitch and Wiring for 2017 Ford Focus ST Hatchback
    Curt 1-1/4-inch Class I hitch # C11431 is a confirmed fit for your 2017 Ford Focus ST Hatchback and the written instructions and a help article are linked to assist you in mounting it on your Focus. However, the online owner's manual I reviewed indicates that this "vehicle is not approved for trailer towing. Never tow a trailer with your vehicle". Your printed manual may differ so I recommend checking it. Sometimes the generalized online versions of manuals have different information. If...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jeff D
Video Edited:
Jeff D
Employee Joshua S
Video Edited:
Joshua S
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 Brent H
Test Fit:
Brent H

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