T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
(159 reviews)
Price: $57.48
In Stock
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
Item # 118643
Retail:$120.62
Our Price: $57.48
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- Reviews (159)
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- Why etrailer?
Tekonsha Custom Fit Vehicle Wiring - 118643
- 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.
Features:
- 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
- Includes ModuLite power module 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
Specs:
- Maximum amperage:
- Stop/turn lights: 4.2 amps per circuit
- Tail lights: 7.5 amps per circuit
- 1-Year limited warranty
Installation
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.
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.
118643 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite
Installation Details
This Product Fits The Following Vehicles
- 2015 - 2022 Ford Transit T150 Cargo Van and Passenger Wagon
- 2015 - 2022 Ford Transit T150 without factory trailer connector
- 2015 - 2022 Ford Transit T250 Cargo Van and Passenger Wagon
- 2015 - 2022 Ford Transit T250 without factory trailer connector
- 2015 - 2022 Ford Transit T350 without factory trailer connector
California residents: click here
Customer Reviews
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118643
Average Customer Rating: 4.8 out of 5 stars (159 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.by: Hoosier07/12/2022
Good kit. Good instructions. Pretty straight forward install. Only problem: the wire that must be run all the way to the engine compartment for battery power was about a foot or two too short! I wouldn’t buy again just for this reason. What a hassle to have to splice in addition wire and heat shrink. Otherwise works fine.
Comments
Running the power wire to the battery can be challenging depending on the vehicle. We do have a FAQ that can help. Please see the link below.
-- 
Jenny N - 07/14/2022Routing the Power Wire for a Trailer Wiring Harness
![Routing the Power Wire for a Trailer Wiring Harness]()
by: Ray09/04/2020
2015 Ford Transit T250
Lighting kit was very easy to install. I watched the video first, which was very helpful.
Comments
I havent used it a lot, but dont expect any disappointments from it.
Ray - 09/05/2021by: Kent03/18/2022
Ford Transit Connect
This was exactly what I needed for my full size transit van - Fairly easy install, but needed the power line to be about 3feet longer. Easiest way would be to put on a lift, but local garage did not have enough height to lift, so crawled my way under & attached power line with rubber tubing on every possible rub line. I may have woven the power line through too many attachment points, but never wanted to go back under to fix. I ended up about 2 feet short of my power source at the front, but heat shrunk a attachment to additional wire of same gauge and it works fine. Very pleased with purchase - 4 star due to short wire on the power side, but everything else was simple plug in - routed wires under he back sill plate for clean installation. Oh, suggest you have lots of wire ties available before starting this project.
by: Keith 08/06/2022
2020 Ford Transit T250
Instructions not very clear. Wiring harness is great
by: James05/06/2021
2020 Ford Transit T250
Couldn’t get any simpler. I am very pleased with the quality of the product. It arrived as expected with all the items. I watched the installation video and went to work. It took approximately 1hr of crawling under the van but it’s well worth it. Only thing I’m missing is the bracket that mounts the 4way to the hitch. I’ll purchase that and be ready to roll!
by: Robert 08/12/2022
As expected snd accorfing other install ers
by: Chris05/20/2022
After a year it has been a solid hitch. The installation was straight forward. The video was extremely helpful. I would definitely recommend it to a friend!
by: Reid03/22/2022
This product is great, and the etrailer video for the installation is terrific. I may have gotten it installed without the video, but it was very simple to follow along as an expert did it. Absolutely the only challenging part of this installation is getting under the car to run the 12V wire upfront, and that was just the physical challenge of getting on the ground so many times.
by: Hyung07/14/2022
It’s great, I have a no problem after install etrailer wire product.
by: Daniel03/31/2022
2016 Ford Transit T250
Good product. easy to install, instructions made sense the only very minor thing is that the wire from the hitch to the + battery terminal is maybe 12 inches too short to be convenient for the extended length transit.
by: Philip01/03/2022
I didn't get the wire harness I had initially ordered. I called and spoke to one person and he immediately responded and sent me the missing harness which I easily installed. I am very satisfied with the prompt and direct service you company provided
by: Troy 08/09/2022
2016 Ford Transit T250
showed up early and install was easy
by: Travis07/20/2021
2020 Ford Transit T350
Everything fit well and was going just as the installation video showed until I got the power cable to the motor (from underneath the van) and realized it was no where near long enough for my 148WB. Needed at least another 5'. Ended up having to remove the drivers taillight again and fished the cable inside the van from there and ran it right to the battery under the seat.
Comments
Thank you for your review. The wiring has to be installed exactly as the instructions say or there will not be enough wire. Extra wire purchased will have to be cut and spliced in.
-- Sierra K - 07/22/2021by: Doug 12/20/2021
2018 Ford Transit Connect
Just recieved , having installed yet . Don’t foresee any issues installing under a 2018 Transit that will pull a 5x10 that I’m presently welding up. Typical good service with helpful etrailer install video and peer review input. Thanks for concern. No pics yet,
by: James08/17/2020
Worked great and easy to install for the most part. Running the power wire is the hardest part having to squirm under the transit do often. Lol I did change one thing from the install vid for my 2016 Transit. I connected the power wire to the second terminal so I didn’t have to modify the cover like the video suggests. It just unclips front and back and then snaps back on. See pix.
by: King08/28/2018
2018 Ford Transit Connect
Easy plug n play wiring harness with 4 pole connector. Wires were sufficiently long enough to properly secure along the vehicle frame. Kit comes with zip ties to hold and hide wires. We tapped the ground wire to a tie down bolt to the frame and ran the positive wire to the battery. This was a fairly easy install on our 2018 Transit.
Comments
Great! We use it to haul our trailer every weekend.
King - 08/28/2019by: Blake 10/04/2021
2020 Ford Transit T250
Simple kit and all connectors fit well. Only gripe is that the the wire to the driver side tail light is a bit shorter than I would have liked (limits options for placement of box)
by: Neil 07/10/2022
Works as described, shipping was on poi nt.
by: Bryant03/22/2022
This was a real easy installation of the wiring hardware
by: Ruben 07/29/2022
Great product
by: John P11/01/2021
This harness was by far the easiest to install.
by: Todd05/18/2022
2017 Ford Transit T250
Haven't put it on yet, but the videos instill a lot of confidence.
by: Johnny04/01/2019
Everything was as you advertised. Everything went so smooth even the one armed man could do it in his driveway. Both the trailer hitch and the wiring was great. I am going to do camping and am turning the back of my van into a RV. Will be planning on pulling a utility trailer for all my extra needs. The hitch I chose is a little over kill. But better safe than sorry.
Comments
GREAT!
Johnny - 04/03/2020by: Stanley H10/16/2021
2018 Ford Transit T250
Great kit. Loved the installation video. It helped alot.
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See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring
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view full answer... - Will Installing the Tekonsha Wiring Harness on my 2020 Ford Transit T-250 Void my WarrantyThe T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118643 will not void any warranty you have on your 2020 Ford Transit T250. There was a bill passed that protects consumers from any type of cancellation of warranty when adding aftermarket components such as wiring harnesses. As long as the product you are using did not directly cause the issue there is no voiding that can be done. I have linked an installation video for you if you would like to check it out.
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view full answer... - Recommended Trailer Wiring Harness for 2020 Ford Transit 250For your 2020 Ford Transit 250, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118643 for your trailer wiring. The 6 pin connector you referenced is not the correct harness for your trailer wiring. I recommend this wiring harness because it will easily connect to your vehicle wiring behind the taillights without any splicing. This will also draw power directly from the vehicle battery to protect your vehicle electronics.
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view full answer... - Recommended Wiring Harness for 2015 Ford Transit T250For your 2015 Ford Transit T250, I recommend the Tekonsha OEM Replacement Vehicle Wiring Harness w Brake Controller Adapter - 7 Way Trailer Connector # 22114 which will give you everything you need for a complete tow package wiring. If you just want a 4-way trailer connector, then I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118643 which connects to the factory wiring behind each tail light. If you use the 7-way harness, I also recommend using the...
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view full answer... - Trailer Hitch and 4-Way Connector for a 2016 Ford Transit T150I will be happy to recommend a trailer hitch, wiring, and other parts for your 2016 Ford Transit T150. For a trailer hitch I recommend Curt hitch # C13193. This is a Class III hitch with a 2 inch receiver. It is rated for 900 pounds tongue weight and 6,000 pounds gross trailer weight (8,000 when used with weight distribution). I have included a link to a video showing an example installation for you. To add a 4-Way flat trailer connector I recommend # 118643. It plugs in line with the...
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