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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 # 118617
Our Price: $74.09
You Save: 37%
Custom Fit Vehicle Wiring

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118617 - Custom Fit 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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118617 or order online at Free expert support on all Tekonsha products. Great prices 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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Tekonsha Custom Fit Vehicle Wiring - 118617

  • 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: 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 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.

118617 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118617 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 - 118617

Average Customer Rating:  4.7 out of 5 stars   (173 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.

2021 Dodge Durango

I followed the online video and it was very easy to install particularly as I already had the fascia removed to install the hitch at the same time, the ground wire for the unit was a bit troublesome as the self tapping screw dint want to cooperate so drilled a hole and substituted a bolt with a washer and a nut with a nylon locking element


Minimal instructions not defined well for the vehicle at all!
Design was adequate at best, with specific vehicle application or knowledge being non-existent.



The wiring has been durable for certain. I stand b yet the lack of instructions or vehicle specificrelevant details. I hope the comments have led to more clear instructions being generated,

2015 Dodge Durango

Seamless fit on our 2015 Durango SXT (Black Top Edition). Additional power requirement does take a bit longer to install since it must be run up to the battery or fuse box. But i find this to be a minor issue as this protects the vehicles OEM wiring if an issue arises with the trailer wiring. We installed this as part of our (Item#76196) Draw-tite Hitch install. Set aside a good hour to hour in a half for complete/neat install of the harness alone. Also worked well with the (Item#18144) 4 Flat bracket to keep the trailer end of the harness secure to the Hitch.


Wiring harness works as expected. Just need to figure out a better way to mount the 4 Pin connector.

The hitch receiver is perfect. This one sits perfectly back so you can still use your factory bumper cover. At least it does in the 14 Durango’s. Need to do some very minor trimming of the lip of the bumper since the lip sits directly under the tow hooks. Without doing some trimming, in the event where the chains are holding up your trailer it will rip your bumper right off. Do the trimming. Overall very please with this product.

2018 Dodge Durango

It is always a pleasure doing a project that I source through I bought the draw-tire hitch, wiring harness, and a couple of other things I needed for the install. Everything ordered was packed in a single shipment. It arrived earlier than expected and undamaged thanks to the care they take in packing the items.

It all went into the car as described in their videos. I love the videos they produce and post to their site. They are such a help in both shopping and execution of the project. Thanks guys!

Here’s a pic of the completed installation.

2016 Dodge Durango

I love the plug and play aspect. Not having to strip wires and use connectors is great. Not sure why I had to instal a power supply wire all the way to the battery at the front of the vehicle, is there not a power supply near the rear of the vehicle? Anyway, overall a great option.


Hi George, I'll be writing a great review! I attached a picture. It's the only one I have at the moment and doesn't actually show the hitch, just the carrier with a bike in it. I installed the hitch in no time by myself. I have some mechanical experience but it definitely wasn't a necessity here. One of the most painless projects I've ever had to do. And I really dig the fact that you guys have youtube installation videos for so many different items and vehicles. Great for the customer and good business on your part. Prices are great too. I haven't installed the wiring yet, but I plan on doing it this weekend, I'll be sure to write a review after that as well. I have my eye on a tonneau cover next.


Pretty simple install and works great. It's a nice option to the Mopar harness that if used with the OEM fuse block requires you to have it programmed at the dealer which is yet another expense. For the price, this can't be beat! I went ahead and mounted it while the bumper cover was off for the receiver install and used wire loom on it to make it that much nicer.


The harness is well made and includes everything necessary for installation, even zip ties.
Two complaints: 1) the adhesive pad for sticking the module to the frame was not sticky at all. Had to come up with my own mounting.
2) I paid extra to get the kit wy 3/17. It did not arrive until 3/19

2016 Dodge Durango

Everything about this transaction was perfect. Thanks etrailer,... would purchase again,... and I will recommend etrailer to my friends.



Ive had this wiring kit installed for a year and it has worked well for me. No issues at all.

2014 Dodge Durango

The unit failed after 7 months of very limited usage leaving my utility trailer lights inoperable. This happened with a previously purchased unit as well. I thought maybe I had a lemon, so I bought another one but got the same result. Failure after less than a year of very light usage. (About 12 short trips per year.) I am an electrical engineer and searched for any wiring issues on the trailer side but found none. I believe the unit is made with inferior components which fail under normal usage. (Specifically, the FETs - Field Effect Transistors used as the switches and drivers to power the trailer lights) I would not recommend this wiring harness to anyone.

Etrailer Expert

Heather A.


Please keep in mind this wiring harness does have a 1 year warranty. With that said, the most common reason these wiring harnesses fail is the black wire from the converter box is not attached to the vehicles battery and the ground wire does not have a good ground with a bare metal surface that is not exposed to the elements. These two factors will cause the black box to fail.

Dodge Durango

Overall the install went well. It was a bit difficult fitting the extra connectors behind the tail light, but overall the install was straight forward. I did opt to run the power wire to the engine bay rather than drilling a hole in the floor to access the battery compartment on the Durango. This lead to some challenges to find adequate routing, but it worked in the end.

2014 Dodge Durango

Hitch was easy to install just the way they said it would be. For those of you who have a 2014 Dodge Durango it more than likely is pre-wired so look first before ordering wire harness. This was my mistake not etrailer if pre-wired get Curt T-connector #55515.



Where iswas the pre wired plug located?

by: 08/20/2022
2018 Dodge Durango

Excellent quality! Install was not hard just time consuming.


Missing the harness

Etrailer Expert

Brooke M.


Thank you for letting us know! We will get you that harness. I have already sent your information to our customer service team and they will be getting in touch.


Was a perfect fit. Would recommend to anyone. Only suggestion would be when tuning the green wire I think, is that I ran it through the square tube from driver to passenger side to bud better.


Purchased this one year ago. It certainly helped to wire up the connector. Worked the first time and still works correctly today.



Still Working Well on my 2019 Durango


Purchased a trailer wiring harness for my 2016 Dodge Durango Limited and and this was a flawless design. The connectors were constructed of high quality product and mated with the SUV's connectors perfectly. Just pulled out the tail lights and connected the harness in-line with the connectors provided, attached the ground wire to a solid part of the body and placed the plug in the mounting bracket I had also purchased. It works flawlessly very first time I used it and have gotten great comments on it even from the Dodge dealer service department.

2019 Dodge Durango

The product functions exactly as advertised. Unfortunately, the installation instructions and videos do not apply to a 2019 Durango R/T and presumably any year after. The installation is premised on threading the L & R taillight connectors down to the underbody via a opening behind each taillight. The openings do not exist on my Durango and therefore required a creative a approach to modify the installation. In the end, this did not require any modifications to the wiring except lengthening the power wire. My installation was combined with a receiver hitch installation. I purchased a MOPAR hitch just to be sure everything fit as OEM.

2015 Dodge Durango

Like everything else that etrailer sells, the trailer wiring harness for my 2015 Dodge Durango was easy to install and did exactly what it was said to do. After watching the installation video on the etrailer site, the wiring harness went right in. No muss, no fuss.
Any time I can buy what I need from etrailer, I do because I know the product will be of high quality and easy to install.

2014 Dodge Durango

hitch fit perfect. installed in 15 minutes. took me longer to get the tire off the stupid cable than it did to install the hitch. The wiring was easy to install. I'd say the only thing that took any time was running the power from the front to the back and using the tip ties to hook it along the way. Only negative if you can actually call it that was the power line was about 2 feet short of making the trip but I had some in the garage so one connector added and voila!


Purchased a hitch receiver, brake light wiring, and the associated mounting bracket a year ago. The equipment is still in excellent condition and works as advertised. Would highly recommend.


The dealership wanted almost $2000. For this. Had the complete kit for just over $300.
One of the easiest installs I’ve ever done. Basically plug and play. I have minimal electrical experience, but with the video they sent on how to install it. I had the hitch and the harness installed in a little over an hr. I’ve recommended you guys to a lot of people.


Everything was there for the install. Was very easy to install as well. Looks very nice and can’t wait to use it. I wish the electrical kit would have come with heat shrink connectors or some heat shrink tubing. Thanks for the product and direction for install.

2014 Dodge Durango

Trailer hitch went on in 20 minutes and the trailer lighting system took me about 4 hours. biggest time consumer was running power wire underneath vehicle from rear to front. wire was also about a foot short. i guess it just depends on how you run the wire. everything i needed was included. great product

Show More Reviews

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

  • Why Can't Connections of Trailer Wiring for 2014 Dodge Durango be Reversed
    The reason you have to install the connectors of the # 118617 on the correct side is that if you flip flopped them or mirrored the install the trailer wiring blinkers would flash opposite. So you'd turn on the left blinker and the right one would come on and vice versa. We were able to install this without extending the wiring on a 2014 Dodge Durango just like yours. Check out the install video link I attached to this page to see the entire process walked through.
    view full answer...
  • 4-Way Trailer Wiring Recommendation for 2015 Dodge Durango
    For trailer wiring confirmed as a fit for your 2015 Dodge Durango Limited without the tow package you would want the part # 118617 which is a confirmed fit. I attached an install video for the harness as well. There would be no computer programming required on your vehicle either.
    view full answer...
  • Trailer Wiring Recommendation for 2018 Dodge Durango
    For your 2018 Dodge Durango you'd want the T-One trailer wiring harness part # 118617. I recommend this harness because it's a custom fit that won't require any splicing and because it's our most reliable option we have.
    view full answer...
  • Why A Modulite Converter Box Doesn't Drain a Vehicle's Battery
    The Modulite box of part # 118617 only draws power from the battery if the turn, brake or tail lights are activated with a trailer connected. If you are not using one those functions the wiring harness is not getting power so it will not drain the vehicle's battery. Basically the modulite box gets a signal from the tail light circuit when one of these functions are activated, and then draws power from the battery to power the wiring harness connected to the trailer. If the signal never...
    view full answer...
  • 2015 Dodge Durange Towing Capacity
    You will look in the vehicle owner's manual for the towing capacities of your specific model vehicle. There also should be a listed a gross combined weight rating. That's the maximum that the vehicle and trailer can weigh together with cargo, passengers, fuel and anything else in the vehicle and trailer. To determine towing capacity, subtract fully loaded vehicle weight from GCWR. If you stay within both your vehicle's towing capacity and the gross combined weight rating all should...
    view full answer...
  • Information for Routing Power Wire to Battery When Installing Trailer Wiring in 2014 Dodge Durango
    While we don't have any videos that cover running the power wire of a trailer wiring harness up to the positive post of a vehicle battery we do have an FAQ article that I attached below that covers what's involved that you should find helpful. The install video for the T-One harness part # 118617 which is a fit for your 2014 Dodge Durango has an install video I attached as well that shows basically everything but the specific routing of the wire under the vehicle. It does show the connections...
    view full answer...
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  • Does Tow Ready Trailer Wiring Harness for 2017 Dodge Durango Require Computer Reflash
    The T-One Vehicle Wiring Harness with 4-Pole Flat # 118617 that you referenced is a confirmed fit for your 2017 Dodge Durango GT and does not require you to have the computer of the vehicle flashed. Due to how it installs there would be no need for that. It installs by installing inline with the tailight connectors on the vehicle which it then interprets the signal going to the taillights and activates the trailer lights accordingly.
    view full answer...
  • Recommended Trailer Wiring Harness for 2014 Dodge Durango Limited
    The trailer wiring harness I recommend for your 2014 Dodge Durango Limited is the Tow Ready T-One Vehicle Wiring Harness # 118617. This wiring harness is confirmed to fit your Durango Limited, as well as to fit other trim levels of the Durango. This is why you noticed the same part number listed as a fit for both Limited and non-Limited models. I double checked with Tow Ready and this wiring harness is confirmed to fit all models of the 2014 Durango. The powered module works to protect...
    view full answer...
  • Can Hot Lead for Tekonsha T-One Wiring Harness Be Run to Battery Under Seat on 2015 Dodge Durango
    The hot lead for the Tekonsha T-One Vehicle Wiring Harness # 118617 can indeed be run to the positive post on the battery you mentioned under the passenger seat of your 2015 Durango. This is the vehicle's main battery, as the terminals under the hood simply feed from this unit. This just gives you the option of running the hot lead to that terminal under the hood or directly to the battery in the cab. Whichever method is easiest for you is the right method! I have attached an install...
    view full answer...
  • Trailer Wiring Recommendation for 2015 Dodge Durango Citadel
    For your 2015 Dodge Durango Citadel you would need the Tekonsha trailer wiring harness part # 118617. The taillight wiring of your vehicle can't handle the amperage load of trailer wiring so that is why you have to run a power wire up to the battery of the vehicle. This allows the trailer wires to be powered by the vehicle battery which prevents your taillights from getting overdrawn and damaged. This may be a bit more in-depth for installation but it is the best way to go. I attached...
    view full answer...
  • Trailer Wiring Harness That Fits 2018 Dodge Durango Without Factory Tow Package
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118617 is exactly what you need to add a 4-way to your 2018 Dodge Durango that does not have the factory tow package. This connector will only require you plug in its connectors behind your tail lights and run a hot lead to your battery. I have added a link to an installation video of this harness on a Durango so you can check out the process.
    view full answer...
  • Trailer Wiring Harness for a 2015 Dodge Durango SXT with LED Tail Lights
    I recommend Tow Ready trailer wiring harness # 118617 for your 2015 Dodge Durango SXT with LED tail lights. This wiring harness plugs in line with the vehicle tail light wiring but draws power for the trailer lights from the Durango's battery. Since the power for the trailer lights comes from the battery and not through the tail light connections it won't harm the LED lights on the Durango. I have included a link to a video showing an example installation for you as well as a link to the...
    view full answer...
  • 4-Way Trailer Wiring Recommendation for 2022 Dodge Durango
    For your 2022 Dodge Durango the best 4-way solution is the Tekonsha kit part # 118617 which installs the easiest and has the most reliable converter box.
    view full answer...
  • Trailer Hitch Recommendation for 2017 Dodge Durango
    For your 2017 Dodge Durango the trailer hitch I would recommend is the # 75713 which is a custom fit hitch for your vehicle. I like it the best because it has the best towing capacities and installs pretty easily. Check out the install video I attached for more info. If you need a 4-way trailer connector you'd want the part # 118617 as well.
    view full answer...
  • 4-Way Wiring For a 2022 Dodge Durango Without Factory Tow Package
    For your 2022 Dodge Durango, the T-One Vehicle Wiring Harness # 118617 is a confirmed fit and will provide you with the 4-way harness you are needing. This wiring harness 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. You can add the etrailer Ball Mount Kit # 989900 if you are needing a ball mount to do some towing.
    view full answer...
  • Does Trailer Hitch for 2019 Dodge Durango Allow 20 Inch Spare Tire to be Stored Under Vehicle
    While there are trailer hitch receivers that will fit your 2019 Dodge Durango, none of them are going to allow the storage of a 20 inch spare tire under the vehicle; that size is too large so it will need to be moved. Only 18 inch spare tires are able to be stored under the Durango when installing a hitch. If that is something you are okay with, the hitch I recommend is the Draw-Tite Trailer Hitch Receiver # 75713. If you plan on doing some towing as well and need a trailer wiring harness,...
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring Installation for 2015 Dodge Durango Limited
    A vehicle lift certainly makes installation of a trailer hitch easier but it is still possible to bolt on a hitch without one. Having more height under the vehicle will make it easier for you to maneuver the hitch as well as your arms and tools but plenty of folks install their hitch without benefit of a lift. A pair of vehicle ramps, which are not terribly expensive and readily available, might be a nice compromise to make your install go a bit better. You can also drive a rear wheel...
    view full answer...
  • Why Do I Need A Separate Power Lead For The Trailer Wiring For My 2019 Dodge Durango
    Some of the trailer wiring harnesses for your 2019 Dodge Durango have a separate power lead. The reason for this is to avoid the overloading of your vehicle's electrical system. All of the options that require a separate power lead included a power module to power your trailer's lights. LED's use less power to provide brighter lights, but one of the unintended consequences of this is they do not provide enough power for your trailer's lights. If I have to recommend a trailer wiring harness...
    view full answer...
  • Troubleshooting the Tekonsha T-One Connector 118617 on 2020 Dodge Durango
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118617 is the correct fit for your Durango according to the manufacturer. Since this is a powered unit, the module gets power directly from the battery and just captures signal from your factory wiring. It sounds like there is a connection issue. I recommend checking the connection points at your tail lights to make sure there aren't any bent pins, and the connections are firmly in place without any loose wires in...
    view full answer...
  • Does Install of Trailer Wiring on 2017 Dodge Durango Require Dealer Activation
    The T-One trailer wiring harness part # 118617 is a confirmed fit for your 2017 Dodge Durango SXT and does not require any dealer activation. Just plug it inline like it needs and run the power wire and your good. I attached an install video for this for you to check out as well.
    view full answer...
  • Troubleshooting Left Turn Signal Bulb Out Message after Trailer Wiring Install
    Do all of the turn signal still work properly? If not, then most likely the problem is a bad bulb and is unrelated to the trailer wiring. You can try making sure all of the connectors of the trailer wiring harness are making good connection as well. You can test the trailer wiring with a circuit tester like # PTW2993 like in the video I attached to see if the wiring harness seems to be working properly. If not, then most likely the harness is damaged and needs to be replaced. Or, you can...
    view full answer...
  • How to Activate Factory Tow Package Wiring on a 2017 Dodge Durango
    To activate the factory tow package wiring on your 2017 Dodge Durango you will most likely have to take the vehicle to the dealer and they can make it fully functional. Trailer wiring harness # C55515 is designed for models that already have the factory wiring activated. The other option for you is to use wiring harness # 118617 which plugs in line with the vehicle tail light wiring. I have included a link to a video showing an example installation of this harness.
    view full answer...
  • Parts Needed to Install 7-Way and Brake Controller in 2015 Dodge Durango
    You will need to start with a 4-way (if you do not have one). For that you would want the # 118617. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. The 7-way of this kit also has a 4-way on the side of it as well.
    view full answer...
  • Wiring Harness for 2020 Dodge Durango Without Factory Tow Package
    Yes, the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118617 is a confirmed fit for your 2020 Dodge Durango without the factory towing package. The Tekonsha wiring harness plugs in line behind your Durango's rear tail lights to provide power and control over your trailers lighting functions. If you are in need of a 7-way vehicle connector than I recommend the Curt Trailer Connector Adapter - 4-Way to 7-Way RV and 4-Way Flat item # C57672. This adaptor...
    view full answer...

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