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

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

Item # 118613
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Tekonsha Custom Fit Vehicle Wiring - 118613
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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 converter reduces strain on wiring system. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118613 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 (66)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118613

  • 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 converter 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
  • 15-Amp mini fuse included


  • 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 behind the driver's-side and passenger's-side tail lights. You will have to remove the access panel doors 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 connector will be stowed in an out-of-the-way location within your 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.

118613 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118613 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 - 118613

Average Customer Rating:  4.8 out of 5 stars   (66 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 converter reduces strain on wiring system.


Installed on my 2015 transit. Overall great with only a couple observation. The video instruction would be a real pain to follow unless you have a lift to get under this van. I ran the power through the interior and through the firewall on the driver side. Much easier than getting this thing on jacks. There is a port you can use on the driver side that is just under the battery. The line to the connector should be just a bit longer but it will work. Take your time, mostly an easy install.


Not really happy that wire has to come out of back hatchway and rest between bumper and hatchway- terrible design - only thing protecting it is the rubber gasket at the hatchway - wish I knew that before I had it installed

I wanted to reach out to you in regards to your review on the wiring harness. If you are able to locate a grommet in the rear of the vehicle the it would be possible to route the wiring down out of the cargo area to under the vehicle. More than likely the grommet used would not be used large enough to route the 4-way connector itself out of the vehicle. You would probably have to cut the connector off leaving enough wire to splice the like-colored wires back together after routing the wiring down out of the cargo area and under the vehicle. If you did the splicing inside the cargo area of the vehicle the splice locations would be protected from the elements and last much longer. Once you have the wiring routed out of the vehicle to the hitch, you can use the 4-Way mounting bracket, # 18144, and the No-Drill Mount Bracket, # 18140, to mount the connector near the receiver on the hitch. I do have a video where we routed the wiring on a 2011 Toyota Sienna which you can see below. I realize that it is a diofferent vehicle however it can give an idea of what would be involved.
-- Etrailer Expert Jenny N - 04/26/2022


Easy to install, clear instructions and working great, it has been installed for 4 months now with no issues.


The kit installation went smoothly. The etrailer instruction video was very helpful.

The wire going to the battery was barely long enough and another few inches would have been nice, but it did work OK.


This wiring kit worked excellent and was very easy to install I would recommend this for your trailer wiring.


The product was great and has been used countless times since being purchased and there are still no issues with it. Highly Recommend!

Ford Transit Connect

2015 Ford Transit Connect - very little ground clearance and no lift. Went with 4 jack stands and a creeper. I watched the etrailer video and wired it exactly the same way. Install came off without a hitch (groan). Checked with a Curt connector tester (very handy to have and only a few bucks) and all was fine. Great product and the installation video was awesome.


Look to be pretty a straight forward installation. Good quality product and I will update this review after a bit of use.


Gray Item. It’s been a year since purchase and this kit didn’t disappoint. Highly suggest if you’re in need.


Thank you. Rocky Rhine. Brad Keselowski Transportation


It was east to install without any problems. It has been working for the last year trouble free. I would recommend this to anyone.

Great, no problems and is still working as new.
Terry - 01/24/2022

2015 Ford Transit Connect

I purchased this particular wiring harness based on the reviews by I recently installed a Curt hitch on my 2015 Ford Transit Connect and was unsure which wiring harness I should use. After watching the videos and harness comparison, I decided to purchase the Tekonsha brand. Installation was straight forward and the package included everything needed to complete the job. Operational test results were perfect. Thank you very much for the great product and website videos.

Ive had the hitch wiring for a year now and it has performed flawlessly every time Ive used it. Excellent wiring harness.
Cecil S - 07/10/2019


All the products I purchased appeared to be made with great attention to detail and best of all were made in the USA. I chose to wait for the Curt products because they were made here and it was worth the short wait.


It’s well thought out and once you figure out how remove panels and run wiring for your vehicle its all plug and play other then the power wire and fuse. I wouldn’t suggest the absolute novice take this on but even minor mechanical ability and you can do it. If your going to do this in your driveway I’d suggest vehicle ramps to give yourself clearance to run the power wire.


I am always willing to giver other retailers a shot at my business. I am glad I did. Great experience in finding what I was looking, for, great pricing, free shipping, fast and reliable. Overall I had a great experience with E-Trailer and I will be back again.


I have purchased other items from etrailer and I have always had a great experience. Ask them about anything they sell, and you will get honest answers!

2018 Ford Transit Connect

I am very satisfied with this wiring kit! I chose this kit over the others, because I like the way the wiring for the passenger side lights went over the doors. I felt that this method was better than running them under the cargo trim where they might get damaged by a heavy object. (It is a cargo van). Also, the four way trailer connector tucks nicely in the jack storage area. For me this is a plus, since I don't tow that often and it keeps the plug clean and dry. The quality of the kit was excellent. The wiring is exactly the right lengths and it made for a very tidy installation.


e trailer was a great company fast shipping and had a product that was simple to install and left a clean installation


Wiring kit seems sturdy enough and installation was reasonable with a few exceptions. 1. All installation videos and instructions featured cargo van models NOT passenger wagon models. There are several differences including significant additional trim and seat belts which must be removed in order to access the wiring connections. 2. A couple wiring splices are required which seem unnecessary had they given a little more thought to design - adding inline fuse and connecting main power wire. Overall, not the best product or experience I've had from etrailer but not too bad. Installation took about 2 hours with most of it dedicated to running the power wire from the back of the van to the battery up front.

2017 Ford Transit Connect

Package had everything that was needed. The installation video on the web site was extremely helpful. Nice to see how it was installed on my exact vehicle. Finding the taillight connector, disconnecting it and installing the T connection of the wiring harness was a little difficult and required disconnecting the seat belt on the passenger side. Otherwise everything went smoothly. Website was great and easy to navigate. Will definitely use etrailer again.


Well there isn't much to report here. The wiring harness was plug and play, as advertised. Installation was both easy and simple after watching the videos featured along with the product description etrailer's website. If you spend more than 30 minutes before you start putting away your tools call etrailer they will have you on the right track in just a few minutes.

2016 Ford Transit Connect

The item was exactly what I needed. Everything about the item was perfect. Putting it in the Ford Transit Connect was another issue, but got it done.

2018 Ford Transit Connect

This was my first time installing a wiring harness so I watched a YouTube video before it came. I was worried the wires would be too short, I'd have to drill holes or I'd screw something up. The installation was a breeze. Everything worked as instructed. This is a great produce.


This is the second Hitch I purchased from
They are very professional, fast and great price. I am very satisfied with there service. Keep up the great job. Thank you.


Show More Reviews

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

  • Troubleshooting 4-Pole Wiring Harness in 2015 Ford Transit Connect
    The T-One wiring harness you referenced, part # 118613 that fits your 2015 Ford Transit Connect, uses a 12V power wire and 15-amp fuse to deliver power to operate the harness. If the entire harness suddenly stopped working then the first thing to check is the fuse. You don't need a wiring schematic to troubleshoot. The other most common reason for the harness to stop working is a bad ground connection. A weak ground could cause some light functions to work while others do not. Taillights,...
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  • Does Trailer Wiring for 2014 Ford Transit Connect work with LED Trailer Lighting
    That sounds like an issue that factory trailer wiring would have if it was installed in your 2014 Ford Transit Connect. I can tell you that if you install the Tekonsha part # 118613 which is confirmed as a fit for your vehicle it will easily work with trailer's that have LED taillights. It has been tested with this style of lighting as well as incandescent and it works great.
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  • Does Tekonsha Trailer Wiring # 118613 Have to Run to Battery of 2017 Ford Transit Connect
    It's very tempting to get the 12 volt power source for the trailer wiring # 118613 from the outlet you mentioned on your 2017 Ford Transit Connect but we cannot recommend this as the reason it needs to run up to the vehicle battery is so that it bypasses any factory wiring and protects it in the event of a short. That way if something were to happen on your trailer wiring any short created would have no effect on the vehicle wiring.
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  • Does Power Wire For Trailer Wiring on 2016 Ford Transit Connect Require Running to Battery
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. For your 2016 Ford Transit Connect you need to install a harness that draws power from the battery to protect the taillight circuits. For that you...
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  • Trailer Wiring Harness Recommendation for 2017 Ford Transit Connect
    We do offer trailer wiring kits that fit your 2017 Ford Transit Connect. For that the T-One kit part # 118613 is a confirmed fit and would work well. This is our most reliable and popular option so it would be the kit we recommend highest. I also attached an install video for this kit for you to check out as well.
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  • Can 2016 Ford Transit Connect Can Support Scooter Lift
    The Curt Class III Trailer Hitch # C13167 that you are looking at features a tongue weight capacity of 525 pounds. With that in mind the hitch itself is up to the task of carrying your lift that will weigh around 300 pounds when loaded. It has been tested and rated to safely support this tongue weight with plenty of safety margin as well. Hitch manufacturers do take into account the extra weight that bouncing down the highway puts onto their hitches and are rated accordingly. The other...
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  • 4-Pole Trailer Wiring Harness for 2014 Ford Transit Connect
    Many of the 4-pole trailer wiring kits we sell will install at the vehicle's tail lights. The harness connectors on such kits install in between the vehicle plugs and the tail lights themselves. For the 2014 Ford Transit Connect we have three such products, all shown on the linked page, and all of these use custom connectors selected to match those on your vehicle. Of the three we have I recommend the Tekonsha # 118613 since we find their wiring products to be the most reliable. If you...
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    Image 1 for
  • Trailer Hitch Recommendation for 2022 Ford Transit Connect
    The best hitch option for your 2022 Ford Transit Connect is the Curt part # C13167 as it's a 2 inch hitch which means it has better towing capacities and is the hitch that most accessories are made for like bike racks/cargo carriers. If you plan to do some towing yes you would need trailer wiring, but if you didn't have plans to tow it would not be needed. The best trailer wiring kit would be the # 118613.
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  • Will Draw-Tite Trailer Hitch Fit 2019 Ford Transit Connect
    Though I'm not quite sure what you mean by "what are the dimensions" in reference to Draw-Tite Max-Frame Trailer Hitch # 75852, I can tell you that this hitch will fit all models of 2019 Ford Transit Connect, so if that's what you have it will absolutely fit your vehicle! I have added a link to the installation instructions as well as an install video for you to check out of this hitch being installed on a Ford Transit Connect. For towing you will also need a wiring harness to power your...
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  • Ball Mount and Cargo Carrier for 2014 Ford Transit Connect Van
    The Curt Class III hitch you mentioned, part # C13167 provides a 2 inch square receiver that the shank on your basket will slide into, so you won't need a ball mount to use the cargo basket. You would want to choose a cargo carrier that has an angled shank to provide greater ground clearance. The Curt # C18152 shank provides 2-1/2 inches of additional ground clearance. If you will be doing some towing you will need a ball mount. To determine which one to use, you'll measure the height...
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  • Recommended 4 Flat Harness For A 2016 Ford Transit Connect
    The powered black converter boxes from Curt are not available separately, so I do recommend replacing it with a custom fit, powered option. We do have the # C56196 converter, but it is not a powered unit. With your 2016 Ford Transit Connect not having enough power to get the lights on a trailer working though, I do not recommend this option. With that being said, these do go out over time and I have found that the Tekonsha T-One Vehicle Wiring Harnesses, like the # 118613, are the superior...
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  • Parts Needed to Add a P3 Brake Controller to a 2016 Ford Transit T250 or Transit Connect
    For the 2016 model year Ford had both a Transit Connect and a Transit T250 but in either case there isn't a wiring harness to plug in a brake controller so one will have to be hardwired in. It is not all that difficult at all; just a lot of running wires to various places on the vehicle. To get started the first thing you will need is a trailer connector if the vehicle does not have one already. If you have the Transit T250 then I recommend # 22114 which adds the 7-Way you will need along...
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  • What 2-Inch Hitch and 4-Way Wiring do You Recommend for My 2022 Ford Transit Connect?
    For a great 2-inch hitch that fits your 2022 Ford Transit Connect, I recommend the Curt Class III # C13167. Not only does this hitch provide you with the most weight capacity out of current hitches for your vehicle (525 maximum tongue weight/4,000 pounds maximum gross towing weight), it also comes with an outer gloss coating over a base powder coat that is better quality than the competitor hitch # 75852. As far as installation, the Curt hitch comes with an easy bolt-on installation that...
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  • 4-Way and 7-Way Wiring Harnesses For a 2022 Ford Transit Connect
    For your 2022 Ford Transit Connect we have the Tekonsha T-One Vehicle Wiring Harness # 118613. This harness will give you a 4-way flat connector that most small trailers use for the lights on the trailer. I have linked an installation video below for this harness on a 2020 Transit. A mounting bracket # 18144 can be used to attach the 4-way connector to the mounting tab on a Draw-Tite Max-Frame Trailer Hitch Receiver # 75852. If you have a larger trailer that has a 7-way connector you...
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  • Class III Trailer Hitch Fit on 2015 Ford Transit Connect with Long Wheel Base
    My contacts at Draw-Tite verified that their 2-Inch Class III hitch # 75852 is confirmed to fit on the long wheelbase version of your 2015 Ford Transit Connect. I linked an install video for the similar Curt hitch # C13167 - also a confirmed fit. For a wiring harness for towing you can use the Tow Ready 4-pole wiring kit # 118613. The recommended ball mount # C45030 can be used with a ball that has a 1-inch shank, such as 2-inch ball # 63845.
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  • Trailer Hitch, Wiring, and Brake Controller Recommendation for 2016 Ford Transit Connect
    We can definitely help get your 2016 Ford Transit Connect setup to tow a trailer. The first thing you need is a trailer hitch, which for that the Draw Tite part # 75852 is a really great option with plenty of towing capacity that also installs easily. You will need to start with a 4-way (if you do not have one). For that you would want the # 118613 which installs easily and is very reliable. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller....
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  • Recommended Trailer Hitch Receiver For 2016 Ford Transit Connect Wagon XLT Long Wheel Base
    For your 2016 Ford Transit Connect Wagon XLT with long wheel base, I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 75852. This is a confirmed fit for your model as well as other Connect models. It has a stylish round-tube design and has an integrated mounting bracket for your trailer wiring. It has a black power coat finish over an e-coat base for excellent rust protection. For your wiring, I recommend the Tekonsha T-One Vehicle Wiring Harness...
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  • Plug And Play Trailer Wiring For 2015 Ford Transit Connect
    If you are needing basic trailer wiring for your 2015 Ford Transit Connect, I suggest the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118613. This kit will allow you the basic light functions on your trailer and the install is straight forward and nearly plug and play. Below you will find a review and installation video of the wiring harness. To add a 7 way to the vehicle, I recommend the Universal Installation Kit for Trailer Brake Controller Item # ETBC7....
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  • Recommended Hitch and Wiring Harness for a 2019 Ford Transit Connect
    I am happy to confirm that the 2019 Ford Transit Connect is compatible with both etrailer Trailer Hitch Receiver item # e77AR and the Tekonsha T-One Vehicle Wiring Harness item # 118613. I have linked videos below for both. To round out your towing setup I recommend the Curt Towing Starter Kit for 2" Hitches item # C45534. This towing kit will provide you with a 2" ball and a fixed ball mount with a 3/4" rise and 2" drop. It also includes a hitch pin and clip, hitch receiver lock with...
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  • 7-Way Trailer Wiring and Hitch for 2015 Ford Transit Connect
    To install a 7-way connector like what you described in your 2015 Ford Transit Connect will first require a 4-way like the part # 118613 which is a confirmed fit. Now if your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # ETBC7 instead of the # 37185 and a brake controller. This kit comes with everything needed to wire up the 7-way and install a brake controller. For...
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  • Parts Needed To Install 7-Way Connector and Trailer Brake Controller On a 2021 Ford Transit Connect
    Yes, we have everything that you will need to add a 7-way Bargman style connector onto your 2021 Ford Transit Connect. First you will need the Tekonsha T-One Vehicle Wiring Harness # 118613. This will give you a 4-way flat connector that you can plug into the Universal Installation Kit # ETBC7. The installation kit will contain all the components needed to complete the 7-way connector as well as add a trailer brake controller. It also has a 4-way flat connector so you will not need an adapter...
    view full answer...

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