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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 # 118722
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118722
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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 118722 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 (26)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118722

  • 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
    • Connect hot lead to battery
  • Includes ModuLite power module that 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. 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.

118722 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Installation Details 118722 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 - 118722

Average Customer Rating:  4.5 out of 5 stars   (26 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.

2016 Ford Transit T350

As always quick and responsive order processing. Received my hitch and wiring harness in 4 days. Install of the hitch is simple, it took less than 10 minutes with the proper tools. (Impact is a must). Wiring harness connectors were a little off, easily corrected by shaving off the right side fin. If you want keep the wiring inside the van, remove the rear step trim and the driver side rear panel you can find power back there and save yourself running it all the way to the battery.


They are an excellent company that actually cares about the client! They truly care about filling your needs and they take the time to listen. This product is great and works flawlessly! I’m so happy we found etrailer! I was told by several other companies that this did not exist for my vehicle. From customer care, great product and product knowledge, to lightning fast shipping, we have enjoyed our vehicle on many of road trips with trailer in tow. Highly recommend!!

2016 Ford Transit T350

I did the install today. The plugs were tight going into the factory plugs had to use a pair of pliers to get one to seat all the way.
The wire running up to the front fell a little short. I had to pull it back re-route it in a less that ideal run, but it just made it.
This is the first time I have ever had an issue with a product I have ordered from etrailer. I have ordered and installed several hitches, brake controllers, and truck accessories.


Harness went in w/o any issue. Works!!!

2017 Ford Transit T350

The power wire was 2 feet to short for my van. I pulled everything as shown in the instruction video and then had to stop and get an additional connector as well as an additional 3 feet of wire to complete the job. What a pain

Ford Transit Connect

Perfect fit on my Transit 350HD DRW
wire for rear bolts worked like a charm, have to admit I had my doubts when I 1st read the installation instructions. All in all a pleasure to deal with on the phone and will highly recommend etrailer to Friends

Ford Transit Connect

Installed this on our Ford Transit about a year ago, no issues, fairly simple to install with the helpful videos. No complaints; works great.

2017 Ford Transit Connect

This was an easy install on my 2017 Ford Transit 350 XLT.

2016 Ford Transit Connect

Shipped quickly and was a perfect fit for my transit 350. The video on YouTube was very helpful!

Ford Transit Connect

Ordered what I hoped would be everything I needed to install hitch, trailer wiring, and trailer brake system for a ford transit. was surprised that it actually came with everything I needed! Being a mechanic I've installed lots of aftermarket things and had to piece them together. very good kit, great prices, and awesome instruction videos on youtube.


Good product. If you've never installed one of these before, I recommend the tutorial video on YouTube. My wife and I followed the video step bey step, and got it all done in about 2.5 hours ( it was night time too, used flashlights a lot). I was waiting for Ford to get their manufacturer part back on to the market, but two+ months later I had to buy anrrrrrrrrrrrrrrrrrrrrrrrrrrr after market version. It is great, my only complaint was the high cost of shipping.

2016 Ford Transit T350

The instructions were simple and easy to follow. Easy installation. Hardest part were the tail lamp connectors, the kit connections seemed to be the wrong size and had to use a lot of force to get them together. That was the only concern I had, the rest was easy. Install time about an hour. Matching the Ford connections perfect would have given 5 stars, but this is really a 5 star product past that minor setback.

2015 Ford Transit T350

I just completed my installation of hitch and light controller. As always with etrailer it was very easy. the products are excellent quality and the instructions clear and easy to follow

2016 Ford Transit Connect

This is a great kit to set up the trailer wiring on the 2016 Ford Transit, it came with everything I needed to install the wiring plus some. The installation video was very helpful to watch before I started and made it easy work, it took me about an hour to do the complete install in my back yard.

2015 Ford Transit T350

The package had everything needed to make the installation. I followed the directions and it was pretty simple.
The only issue I had was that the instructions said to connect the black power wire to the "red" wire on the module. Sorry, there is no red wire to connect to. I guess they may have more than one module which may have different color wires. I connected the black power wire to the "black" wire on the module. Very easy install. I ran some small plastic tubing under the van and slid the black wire into it as a sleeve for more protection. Thanks.


This product was so easy to install. Everything needed for the installation was in the packet. The video was as helpful. It explained everything in detail how to install. Over all I would give this company 5 stars. thank you for your help.

2016 Ford Transit T350

Great product, shipping was fantastic and quick, installation was a breeze!

Thank you!!

Ford Transit Connect

Very easy install with clear instructions, although the sockets were very tight I managed to successfully put the kit together. Id recommend this to other transit owners.

2018 Ford Transit Connect

For the 2018 transit 350 Hd extended you will need to add about 10 feet of wire for the 12 v supply.

2015 Ford Transit T350

Very impressed with product works as it should. Highly recommend.


very easy to install and of great quali ty


2015 Ford Transit T350



Show More Reviews

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

  • Recommendation for Trailer Wiring Harness 2022 Ford Transit 350 High Top
    For your 2022 Ford Transit T350 I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, # 118722. With this, you can easily install a 4-way trailer connector to your Ford Transit T350 Van Build as the T-One connector plugs directly into existing wiring. This also includes ModuLite power module that connects directly to battery to avoid overloading vehicle's electrical system. Please note the linked product review and installation videos below.
    view full answer...
  • 4-Way Trailer Wiring Harness that Fits 2019 Ford Transit 350 Dually Extended
    Since you have the dually extended version of the 2019 Ford Transit T350 the 4-way wiring kit you'd need is the # 118722. We had the chance to install this kit on a Transit like yours which I attached an install video link for on this page. The video shows a single rear wheel version but it fits the dually models too.
    view full answer...
  • Trailer Wiring Recommendation for 2016 Ford Transit T350
    You would see a round connector near the bumper of your 2016 Ford Transit T350 that the part # C55774 would plug into if you had the factory wiring. Most likely you do not though and would need the trailer wiring harness part # 118722 which is a custom fit and would work well. I attached an install video for you to check out too.
    view full answer...
  • Trailer Hitch Hardware and Wiring Harness for 2016 Ford Transit T350
    If you purchased the Curt Trailer Hitch Receiver # C13193 from us then all the necessary mounting hardware should have been included. Sometimes the hardware kit is well-hidden inside the hitch receiver so I recommend checking in there to make sure it's not there waiting for you. If you did purchase the hitch from us and the hardware is missing just let us know. Otherwise if you purchased the hitch somewhere else and simply didn't get the hardware as well this can be obtained with part...
    view full answer...
  • What Parts Are Needed To Add A Trailer Brake Controller To A 2022 Ford Transit T350?
    To get the Tekonsha Prodigy P3 # 90195 working in your 2022 Ford Transit T350, you will need to start with some wiring. Specifically a 4 Flat, if you do not already have one. If you do not, I recommend going with the Tekonsha # 118643 for a single rear wheel, or the # 118722 for a dual rear wheel. Tekonsha makes the longest lived harnesses out of all the brands we carry, so one of these will be the way to go. Once you have the 4 Flat installed, the Universal Installation Kit for Trailer...
    view full answer...
  • Recommended Hitch for 2016 Ford Transit T350 with Dual Rear Wheels
    I may have a solution for you to add a hitch, but there is not a hitch with a 10,000-lbs capacity for the 2016 Ford Transit T350 with dual rear wheels. With that said, it appears that the towing capacity of the T350 is only 5200-lbs, so you would be limited to that since the vehicle has a lower towing capacity than the hitch. For that reason, you're only going to be able to tow 5200-lbs, so a 10,000-lbs capacity wouldn't really make a difference on this. The only confirmed hitch that will...
    view full answer...
  • Correct Trailer Wiring Harness for 2020 Ford Transit 350 High Top Extended Length
    The only descriptor that changes the trailer wiring harness needed is whether your 2020 Ford Transit T350 is a SRW or DRW model. If your 2020 Ford Transit T350 has single rear wheels as opposed to duals, the # 118643 Tekonsha trailer wiring harness would work perfectly for you. If you have a dual rear wheel model, use # 118722, either of which would provide a 4-pole trailer connector to provide basic lighting functions to the trailer. If the trailer you'll be pulling has brakes, you'd...
    view full answer...
  • Fit of etrailer Brand e98842 Class III Hitch on 2017 Ford Transit T350
    As long as your Transit T350 isn't a cab/chassis or a cutaway chassis model, the etrailer # e98842 class III hitch would be a fit. If you'll be towing with the hitch, you'll also need a trailer wiring harness like # 118722 for a 4 pole connector or # 22116 for a 7-way. You'll also need a ball mount like # 2753 and a # 19260 for a 1-7/8 or # 63845 for a 2 inch trailer ball. I've linked to install videos that you might find helpful.
    view full answer...
  • Parts Needed to Install Brake Controller in 2017 Ford Transit T350
    Installing the Tekonsha Voyager Brake Controller # 39510 with Harness # 20127 on your 2017 Ford Transit T350 does in fact require a 4-way as well as the Universal Installation Kit for Trailer Brake Controller # ETBC7, and we do state in multiple areas that a 4-way is required, including the ETBC7 product page as well as fit guide pages and help articles which I have linked for you. The reason a 4-way is needed is because it gives you the basic lighting functions. The Upgraded Heavy Duty...
    view full answer...
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  • Parts Needed to Add Electric Trailer Brake Controller on a 2020 Ford Transit T350
    The parts you need kind of depends on what you already have for your 2020 Ford Transit T350, but I'll give you a list of all the parts you need either way. If you already have a trailer hitch and basic wiring like the T-One # 118643 (single rear wheel) or # 118722 (dual rear wheel) installed on your Transit then you need the Universal Wiring Kit # ETBC7 which plugs into your existing 4-Way and provides you with all of the connections and wiring for a brake controller. For a brake controller...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Video by:
Kathleen M
Employee Cole B
Installed by:
Cole B
Employee Randy B
Test Fit:
Randy B
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C

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