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  1. Custom Fit Vehicle Wiring
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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 # 118806
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118806
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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 118806 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 (28)
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Tekonsha Custom Fit Vehicle Wiring - 118806

  • 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
    • 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


  • 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. 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.

118806 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118806 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 - 118806

Average Customer Rating:  4.6 out of 5 stars   (28 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.


Everything is that is needed to get the job done is included. But, it feels like a generic kit and not a vehicle specific one. The wires are much longer than needed leading to a bundled up wad zip tied near the box. I wish it came with a holder for the 4-pin. Once you figure out what angle to pull the tail light adapters up at, it isn't too terrible. The biggest drawback is the black rectangle nonsense near the plugs. Whoever decided on that shape never actually installed it. Running the +12 from the battery was a little tricky. Once you get it down along the firewall it gets easier. I ran it along the brake and fuel lines staying as far away from the exhaust as I could. Once you get to the bottom of the car, the clips that hold the lines have a center section which you can push the wire into and it will retain it. I loosened the long insulation panel on the driver's side and ran it to the back.

2021 Ford Edge

This was, by far, much harder than installing the actual hitch but that difficulty had nothing to do with the product but with the car. The product had everything that I needed. They are making things in the new cars so compacted and unaccessible that it is very difficult to find a good path, even with the video. Coming down through the engine compartment was the hardest. Ford did not make it easy.

One thing that I did that was contrary to the video was that instead of trying to pull the ends of the wiring with the connections on them, I cut them off with about 6" of wire left on the connectors. Pulling the wires was much easier in the tighter spaces. I used water tight, heat shrinkable butt connectors to reconnect the ends. This also allowed me to cut the wiring to the length I actually needed and I did not have to secure a lot of extra wiring after the job was complete.


Installed in 1 hour. Lights took 2 but I was being careful. Great kit, all the gear worked great. Good instructions to use the cheater wires. Nice product. Thx. Gold star!!!

2012 Chevrolet Volt

Way too complicated. Kit says run a 12 volt from battery to box at back of car. This car has way too many computer controlled devices to be doing, wasted my money !


It's excellent quality and fits perfect ly.


Fit great however, it took longer than the advertised 45 minutes to install. I even had it up on a hydraulic lift.

Working great I’ve had no problems
Gerald - 01/22/2021

2012 Chevrolet Volt

This will be the third one which I have installed. First off, there is no need to run any wires outside the vehicle except the harness which runs to the trailer. Keep everything inside. Remove rubber liftgate sealing strip and plastic strip where latch is. Pull back interior side panels. The Ford engineer who designed the wiring harness path should be fired. Route wires through the hole where those funny shaped doors with the rubber flappers are. A 12 volt source is on the drivers side panel, however I used a plug rather than cut wires. I will never again purchase a vehicle without a trailer package, I'm getting too old for this .

2019 Ford Edge

We are very happy with the product on our 2019 Ford Edge Titanium. The videos and detailed install reviews posted by others made it a fairly straight forward process. We are in our late 60's and finished installing the hitch and running these wires in about 2 hours. The hardest part was figuring out how to get a grip on the streamlined tail light lens to pull it off the car for access to the wiring connectors. Rubber gardening gloves helped! Oh also - when testing the lights - remember to lower your tongue onto the hitch or the continuity won't be there for the lights to actually work. Parking next to it didn't do the job.


Worked out great. Watching the video is a must. I did this on a garage floor with the driver side raised in front.
Would have saved a lot of time if I had a car lift.


It works great. The installation was super easy. The instructions and guides were simple to understand very helpful.


Great products and the best pricing. Very quick ship!!

Ford Edge

This is a nice kit. Installation went pretty smoothly. The trickiest part is getting the Y connectors up behind the bumper to the taillights. My tip - be sure to remove the zip tie between the 2 connectors, and arrange in a way where you can pull the plugs through one by one. There is a rectangular isolator at the Y which wants to be inline with the second plug as you try to pull it through. They have to come seperately and that isolator only fits one way. Also, once you get it to the void behind the bumper, there is no turning back (they aren't easily coming out the bottom), so tape it well and be prepared - it's a tight squeeze but it works.

This is my second Edge installation and it is a pain having to run the power feed all the way to the front, but alas it works so just plan on another 30 minutes of snaking it across the chassis. Also, finding a route down from the battery isn't a cake walk - I ended up getting my snake into the wheel well, but once there I was able to get the wire behind the splash panels with 3 screws, so it all worked out!

2019 Ford Edge

Installed on my 2019 Ford Edge Titanium. Watch the installation videos and take your time. The tail lights do need to be removed but do exactly what the video says and they will pop off. Tips: 1) the video says to be careful not to let the existing wiring connector that goes to the tail light fall into the hollow of the car body. You actually need to let it drop down so the wiring harness can be pulled through. Once the harness is pulled through use needle nose pliers to pull it back up. It does not drop far. 2) I attached the module with a machine screw, lock washer, large washer and nut to a large existing hole in the under carriage. I did not want to trust the adhesive pad provided. 3) Make sure that you heat shrink the connectors to prevent corrosion of the wire ends. I also used dielectric grease (perhaps an overkill). Everything works great!


The trailer hitch and wiring harness I ordered from etrailer is perfect and was easy to install. there was more then one to choose from and Phyllis was extremely helpful in assisting me with getting the right one. Thank you!!

2019 Ford Edge

Painless ordering process and quick shipping. Not etrailer's fault but when the product was delivered the box was damaged, as a result part of the coating on the mounting brackets was rubbed off down to the metal. Will have to coat after mounting the hitch onto my vehicle so it won't rust.


Appears to be a very nice easy to install harness. On line video of installation makes almost fool proof Very fast service. Would highly recommend


Great job


on time delivery installed- my wife approves nothing else to say all good bobby platt

2019 Ford Edge

Works great but helps to have a lift. Have to fish the wires through some tight spots. That’s the Edge not the kit!


I was impressed with how quickly I received the items for my trailer hitch. No "hitches" at all.


Worked well perfect fit.

2017 Ford Edge

Quick delivery and simple install


Your product connected and works fine.


Perfect fit, easy to follow directions and installation took just about as long as estimated..

2019 Ford Edge

Show More Reviews

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

  • Recommended Trailer Wiring Harness For 2020 Ford Edge Titanium
    There is a trailer wiring harness for the 2020 Ford Edge Titanium with Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118806 which will plug in behind the tail lights and give you a 4-pole flat on the Edge to power the trailer lights. The Tekonsha brand wiring is known to be more reliable than the other brands especially the converter boxes.
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  • Trailer Wiring Recommendation for 2019 Ford Edge Titanium
    Yes we have the Tekonsha trailer wiring harness part # 118806 which is a confirmed fit for your 2019 Ford Edge Titanium and the best option for your Edge. It has the easiest install and the most reliable option we have for your vehicle. I attached an install video for you to check out as well.
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  • Trailer Wiring Recommendation for 2021 Ford Edge Titanium
    The best 4-way trailer wiring kit that fits your 2021 Ford Edge Titanium is the Tekonsha kit part # 118806 which installs the easiest and has the most reliable converter box. I attached an install video for this kit for you to check out as well.
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  • Recommended Trailer Wiring Harness Fit for 2020 Ford Edge ST Line
    According to Tekonsha, the # 118806 trailer wiring harness will only fit 2020 Ford Edge models in the Titanium trim. For all other trim levels including the ST Line, you'd use # 118805. If you click the provided link, you can see a helpful install video.
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  • Difference Between Tekonsha Trailer Wiring that Fits 2019 Ford Edge Titanium and Non-Titanium
    Since the difference between the 2019 Ford Edge Titanium and the other models is that the Titanium comes with LED taillights Tekonsha had to make a different kit with a different converter box that accomodates the difference in lighting. This is why the # 118806 fits the Titanium and the # 118805 fits the other models. Both of these are easy to install though. I attached an install video for the kit that fits your vehicle for you to check out as well.
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  • Difference In Tekonsha T-One Wiring Harnesses For a 2020 Ford Edge Titanium and Other Trims
    The tail light connectors are different on the 2020 Ford Edge Titanium from the other trims. You can see in the images I put below that the tabs off the connectors are in different places. The Tekonsha T-One # 118806 for the Titanium has black connectors with the tabs both at the corners. While the Tekonsha T-One # 118805 for other trims has tan connectors and the one tab is right next to the latching tab.
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  • Correct Trailer Hitch for a 2019 Ford Edge Titanium
    The Draw-Tite Max-Frame Trailer Hitch Receiver part # 75234 is a fit for a 2019 Ford Edge Titanium and what I recommend. The Draw-Tite hitch has a hidden design like you are looking for which means the cross tube is hidden and only the receiver tube will be shown. This also ensures that you don't loose too much ground clearance. If you will be using the trailer hitch for towing then you will also need a trailer wiring harness, the T-One Vehicle Wiring Harness part # 118806 is what I recommend...
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  • Concealed Cross tube Hitch For 2019 Ford Edge Titanium and Wiring
    The only concealed cross tube designed hitch available for the 2019 Ford Edge Titanium is the Draw-Tite Max-Frame Trailer Hitch Receiver # 75234. The only portion of the hitch that will be visible once installed is the receiver. The bulky cross tube will be hidden underneath the vehicle. I have attached a photo to show what this will look like. The wiring harness you need for the Titanium is T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118806. This is the only...
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  • Does Draw-Tite Trailer Hitch 75234 Fit 2021 Ford Edge Titanium & ST-Line
    It was smart to check and I can verify for you that the Draw-Tite hitch you asked about does indeed fit both the 2021 Ford Edge Titanium and the 2021 Ford Edge ST-Line: - Draw-Tite Max-Frame Trailer Hitch Receiver # 75234 The # 75234 does have a really nice design, like you mentioned, with a concealed crosstube and only the receiver showing to keep the aesthetic of your '21 Edge in tact. The only other thing you may want if you are looking to do some towing is a wiring harness, with...
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  • Recommended 4 Flat Wiring Harness For A 2021 Ford Edge Titanium
    From the wiring harnesses available for your 2021 Ford Edge Titanium edition, I highly recommend the Tekonsha T-One Vehicle Wiring Harness # 118806. Though one wire will need to be run up to the battery for needed power, it will be a plug and play harness, so a quick install. From my experience, I have seen the Tekonsha wiring harnesses to be the longest lived out of the brands we carry. As to mounting the wiring, we have the Tow Ready Mounting Bracket 4-Pole Flat # 18144 that will attach...
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    The Draw-Tite Max-Frame Trailer Hitch Receiver is confirmed to fit your 2020 Ford Edge Titanium with hands free liftgate. Keep in mind, this will likely limit the functionality of the kick sensor so you will need to find the right spot on either side of the receiver to activate it. The same is true for any hitch you choose to install on your vehicle. Also yes, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118806 is the correct wiring harness for the Titanium. This...
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  • Will Installing Trailer Hitch on 2009 Ford Edge Cause Hands-Free Liftgate Not to Work
    Installation of the Draw-Tite # 75234 Class III hitch on your 2019 Ford Edge will block a portion of where the sensors can 'see', but the liftgate will still function. Usually on the Ford vehicles, the areas about 3-6 inches to the right and left of the receiver tube over to the corners of the vehicle will still work just fine. I do know that some vehicle manufacturers like Honda offer relocation brackets for the liftgate sensors, but I have not been able to find anything for the 2019...
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  • Troubleshooting Blinker Hyperflash On 2019 Ford Edge Titanium After Shop Installed Trailer Wiring
    It doesn't sound like the hitch install would cause the wiring issues. More than likely you also had a trailer wiring harness added as well like the part # 118806 on the Edge Titanium. There a few reasons why your left blinker could be hyperflashing. It could be an issue with the ground of the wiring. You want to make sure there is a good ground to a clean bare metal surface of the vehicle's frame. The harness may not be fully seated with the correct plug. If that is the case they will...
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  • Will Trailer Hitch Receiver for 2020 Ford Edge Interfere With Camera on Lift Gate
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  • Does Heat Shield On 2021 Ford Edge Need To Be Removed To Install Curt Trailer Hitch C13234?
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  • Will Installed Trailer Hitch Block Hands-Free Liftgate Feature on 2019 Ford Edge
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    Installing the Draw-Tite # 75234 Class III hitch on your 2021 Ford Edge will interfere a bit with the operation of the hands free liftgate feature, but it won't prevent it from working. The sensors under the center portion of the bumper will be blocked by the hitch receiver opening, but the areas to the left and right will still work, as shown in the photo I've provided for you. If you'll be towing with the hitch, you'll need a few other items to complete your towing setup. If your Edge...
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  • Recommended Trailer Hitch Receiver For Thule EasyFold XT Bike Rack On a 2021 Ford Edge Platinum
    For your 2021 Ford Edge I recommend the etrailer Trailer Hitch Receiver # e36RR. This receiver has a hidden cross tube making it less visible and the portion of the receiver that is exposed has a matte black powder coat finish that closely matches the trim of your Edge. Your Thule EasyFold XT Bike Rack # TH903202 will pair well with this receiver. I do recommend installing a Tekonsha T-One Vehicle Wiring Harness # 118806 so that you can use the Auxiliary Lights # C53201. These lights...
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  • Parts Needed For Trailer Hitch Receiver, Wiring Harness and Brake Controller For a 2022 Ford Edge
    The etrailer Trailer Hitch Receiver # e36RR is a great hitch for your 2022 Ford Edge. It has a matte black finish that blends in well with the matte fascia parts on your edge. For a 4-way and 7-way you will need a combination of parts. First you will need a T-One Vehicle Wiring Harness. The Tekonsha # 118806 fits the Titanium trim and the Tekonsha # 118805 is for all other trim levels of your Edge. This will then connect to the Universal Installation Kit # ETBC7 giving you a 7-way and...
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video by:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C
Employee Robert C
Test Fit:
Robert C

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