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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 # 118675
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Custom Fit Vehicle Wiring

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Tekonsha 4 Flat Custom Fit Vehicle Wiring - 118675
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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. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118675 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 (115)
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Tekonsha Custom Fit Vehicle Wiring - 118675

  • 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 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: 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 rear threshold plate, trunk liner, and tail light assemblies to access this harness.

Tail Light Connecter Diagram

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 your side storage compartment.

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. This unit will also ensure that your trailer's lights illuminate fully, even if your vehicle has pulse-width modulation (PWM) wiring.

118675 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118675 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 - 118675

Average Customer Rating:  4.8 out of 5 stars   (115 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.


followed instructions exactly as well as the [online] tutorial for my 2016 tiguan and installed didnt work... and im really handy. dont even know where to go to troubleshoot at this point

I wanted to reach out to you in regards to your review on the wiring harness. You mentioned that the harness was not working for you and I wanted to see if you could explain in more detail what is happening with it. We do have a FAQ that can help with troubleshooting on the harness.
-- Etrailer Expert Jenny N - 08/02/2022

2015 Volkswagen Tiguan

Easy install. Plug and play. Watched video and followed directions. Works first time. Uhaul wanted $389 plus tax to install hitch and wire lights. Cost me $120 to complete job in about an hour.

2017 Volkswagen Tiguan

In the spring of 2021 I purchased and installed a Teckonsha trailer wiring harness in our 2017 VW Tiguan. The instructions were easy to follow and the installation was straight forward - taking approximately 90 minutes to complete.
The wiring has worked flawlessly.
I would recommend this product.

2017 Volkswagen Tiguan

I purchased this product for a 2017 VW Tiguan. I had originally ordered and installed the Curt Wiring Harness for this same vehicle but there was a problem with the module not functioning correctly when the headlights where turned on. I returned the Curt product and ordered this Tekonsha. It installed in no time at all and works perfectly. Having the opportunity to actually physically hold both products in my hands I would say the Tekonsha looks and feels "beefier" compared to its Curt counterpart. It also comes with a 15 amp breaker compared to the 10 amp breaker the Curt offers. I would recommend this product.

2015 Toyota Camry

Another great hitch and wiring. Installed on Tiguan already.Takes 15 minutes, wiring takes 30 minutes. Still towing 25 yr old aluminum trailer I built.
I will add a basket for gas cans weld one up or buy one? Don't know yet looking through junk pile for steel.
Should last until I get hit again, the hitch will help in an impact.
Last one on Camry took 45 mph hit from rear stopped at light. impact bent the frame
totaled car.
will re -cut and weld the old hitch into something else.

Works fine. No problems.have bought a few over the years
Eric - 06/01/2020


I really liked the service and exceptional customer support. These people were very helpful and I usually don’t leave comments especially this far later but they stuck out.

2017 Volkswagen Tiguan

I watched the install video and knew right away I was going try interior routing the power wire because I don't have access to a lift. I found a grommet in the firewall where I think the clutch pedal would go. I was afraid I might run out of wire routing it this way. That didn't happen. Had about 3 ft leftover. Everything else went just like in the video. I ordered the tester they used to check my work. Success!!

2015 Volkswagen Tiguan

This unit provides connection to the trailer lights. The VW, like many modern cars, have added complex lighting circuitry to keep the driver informed of a blown bulb, which means a simple hookup to the trailer lights is no longer possible. This unit provides separate power for the trailer lights, thus keeping the VW system from thinking there’s a problem with the vehicle lights. Once hooked up, it worked great for my small trailer (regular tail/stop/turn lights, plus 4 more marker lights).
Installation too nearly two hours, most of that trying to figure out how to remove various plastic pieces from the rear of the car. First side took me over an hour, second side much quicker as I learned the tricks.
The lights connection comes from the back side of the car’s two tail lights, with a connection you plug in without any cutting or changing the vehicle wires. Then you need to provide 12v power to the small black box that this kit provides for trailer light control. The instructions call for running a wire (provided) up to the battery, but our ’15 Tiguan has a power plug in the rear cargo area so I elected to draw 12v power from there. Only downside is that the power plug is only hot when the vehicle’s on, so if you park the car and put on the flashers then the trailer lights will not be flashing. When the car is on, everything works perfectly.
I installed the trailer wire pigtail in the right side wheel well, so I just open the hatch, pull the plastic cover panel, run my trailer pigtail to the trailer and shut the hitch. When not in use, the wire and the draw hitch ball mount, plus a pair of gloves, are hidden behind the plastic cover.
Overall, a great bargain compared to the cost of the VW unit!

2018 Volkswagen Tiguan Limited

Super useful and amazing, was a plug and play package basically. Will definitely be using this website/company for everything I can. Came super fast and well packaged


Easy installation

Work very well
Dt - 12/20/2021


etrailer is my new go-to for EVERYTHING tow related. Not only do they carry a great selection of QUALITY parts, the prices are as good as anywhere on line PLUS they give you detailed video tutorials so you can do it yourself!!!

Everything is still perfect, and I still cant believe I did this on my own! LOVE IT!!!
DHarperWV - 05/08/2020

2010 Volkswagen Tiguan

I purchased a trailer hitch and wiring kit for my VW Tiguan on Friday and it arrived on Monday! In the description it stated 20 min for hitch installation and 45 for the wiring kit. The hitch was on in 10 minutes, but the wiring harness took 3 hrs, and i still have a few pieces of my car to put back together. As far as quality, the pieces look great, but haven't been put to the test yet.


Excellent service. Contacted every step of the process by a representative from e trailer. Will use again. Thanks

Im trying to get wiring on my 2012 Tiguan. Which vehicle did you install on? Any hints?Thanks!Matt
-- comment by: Matt F - 09/13/2015
Matt, installation was relatively easy, took me about 3 hours though because it was difficult to pass the wire from back of the tiguan to the battery through the Firewall. The box that is part of the wire harness sits in the cavity next to the right tail light. The plug-and-play nature of this set trumps that of older splice and pray styles. The easy part was unplugging the wire harness thats already connected and plugging in the one supplied by e- trailer. if you can follow the directions and have a good head on your shoulders you should be fine. You will need,a pry tool, to remove paneling.a socket wrench seta wire strippersome spare wire connectors in case you crimp the one they provide poorly - I didnt solder anything but thats not to say you shouldnt if you chose to do so. a cobalt tipped drill bit set to get through the firewall. - i chose a spot directly under the glove box and ran the wires across the engine from the battery. be sure to avoid to O2 line and a testerThe left and right blinker will work with the tester when installation is complete.Im assuming the brakes require a closed circuit on the flat four because they worked when we connected my girlfriends 1969 lo liner to it.
-- comment by: Frank S - 09/22/2015
Frank,Thanks for the advice. Does it matter whether you mount behind the right or left tail light?Again, thanks for the advice.-Matt
-- comment by: Matt F - 09/23/2015

2017 Volkswagen Tiguan

Both the hitch and the wiring harness fit well and installed with no issues.


The T connectors were awesome!Plug in and snap your done! The last wiring job I did dealt with splicing thin wires was a nightmare,this kit was so much easier! I do recommend a vehicle lift for routing the main power wire to battery,crawling on floor was not fun.


Used this many times in the past year and haven't had any problems with it. Very well designed system!


Product worked well for about 6 months and now the trailer lights stay on the whole time it’s plugged in. Have to unplug the lights in order to get them to go off

This sounds like there is a short somewhere in the lighting system. Check for any bare, damaged wires along your trailer and on your vehicles wiring harness. Make sure there are no spots where the insulation has worn off the wiring or where the wiring is pinched and allowing the bare wire to touch bare metal. Repair or replace damaged sections of wiring and see if that solves the issue of the trailer lights staying on all of the time.
-- Etrailer Expert Victoria B - 09/23/2019

2012 Volkswagen Tiguan

Trailer lights wiring kit was "as ordered" & install went smoothly after watching the video online (hard-copy instructions were marginal at best). Seems to get the job done so far.

DJ - 08/28/2017
VW makes it challenging to route the power lead but its done
DJ - 08/28/2017


Overall this is a good product that’s simple to install. I didn’t give all five stars because the yellow wire that crosses the back of the car is not long enough and had to be extended. the quality of the included splices are laughably poor.

There is room for improvement on the flat fire harness to to the hitch as well. There isn’t a good way to get the 4-pin connector that goes to the trailer out of the vehicle included. You really have to cut it off and splicing it back in; the instructions prefer to gloss over this part and just vaguly say you need to get it to the hitch area. I went though an existing grommet in the floor on the passenger side for the backup light and then used a pluggable connector I purchased locally. Shipping this harness with pins installed on the flat harness so they can be pulled though the grommet and then inserted into a connector would be a very simple solution.

2014 Volkswagen Tiguan

The wiring harness arrived quickly and was complete. The etrailer video was clear and showed all of the steps necessary to correctly install the wiring. It is really time-consuming to run the power lead to the battery without a lift for the car, but it can be done with patience and some jacks. I am a novice at any type of auto work and I got it done in a couple of hours. Great product and great directions!


Extremely pleased with the wiring harness. Since my towing requirements are light, I purchased a 12V male plug that I wired to the harness. It works perfectly as there is a 12V outlet in the cargo area. Far easier than running a 16ft wire under the car and up to the battery.

2015 Volkswagen Tiguan

The wiring harness was easy to install and took me about 30-40 minutes to complete. I followed the video on the website, which helped a ton. If you follow along with the etrailer video, then the install will be a snap. The hardest part was routing the wire up to the battery, but that's just because I couldn't put the car on a lift so I was crawling around on the ground to get the wire routed properly. Everything worked the first time after install!

2013 Volkswagen Tiguan

The hitch was a perfect fit and thanks to your video the profit wiring harness was also easy to install. For my 2013 VW Tiguan I got the Curt hitch and love the look. It is perfectly flush with the rear bumper. You are not going to bang your chins when you get item out of your trunk. VW help out by drill and anchoring the hitch bolts. I have put hitch on other cars and this was 10 times easier. No dropping down muffler and trying to get torch wrenches between frames and body panels with 2 inches of throw.


I have not installed yet. But have installed the same unit on a past vehicle. This is the best plug and play unit out there period. And etrailer always offers the best products to choose from


The wiring kit was easy to install. No cutting or splicing was reqired. It connected to the existing car harness rhrough the taillights. By watching the existing video from your website upfront, I knew what I had to do.
Very good product.

Show More Reviews

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

  • Where Does Black Wire of 118675 Go to On Vehicle
    Sounds like you are talking about the power wire of the # 118675 that needs to run to the positive post of your vehicle battery. This is the power wire that is used to power all the trailer taillights instead of putting the load on your taillight circuits. I attached a help article on running this wire as well.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2016 Volkswagen Tiguan
    The Tekonsha T-One part # 118675 that you referenced is a confirmed fit for your 2016 Volkswagen Tiguan and will give you a 4-way trailer wiring connector. I could not get any information online for the part number you referenced so I am not sure what functionality it would have in comparison. The 4-way covers all of the taillight functions. I attached an install video for this harness for you to check out on a similar 2016 Tiguan as well.
    view full answer...
  • Trailer Wiring Recommendation for 2017 Volkswagen Tiguan
    For your 2017 Volkswagen Tiguan we have the Tekonsha trailer wiring kit part # 118675 which is a confirmed fit and would work well. Of all of the trailer wiring kits we offer the Tekonsha kits are our most reliable so we recommend them the highest. I attached an install video for this kit for you to check out as well.
    view full answer...
  • Recommended Trailer Wiring Harness for 2017 VW Tiguan
    The Tekonsha T-One Vehicle Wiring Harness # 118675 referenced in your question is confirmed to fit your 2017 VW Tiguan. Nothing else will be needed to install this harness so that you have a 4-Way connector to connect with and power a trailer's basic signal lights. The custom harness will install by simply plugging into factory ports located behind the driver and passenger side tail lights. Once those connections are made, you will then run the hot lead up to the battery to power the...
    view full answer...
  • Trailer Wiring Recommendation for 2013 Volkswagen Tiguan
    What you described sounds like a shorted out converter box on the trailer wiring you installed. The converter boxes of trailer wiring are designed to take themselves out before allowing a short from trailer wiring to make it to the vehicle wiring. We've also noticed that Curt converter boxes typically short out easier than other brands. So best option will be to replace your Curt kit on your 2013 Volkswagen Tiguan with a Tow Ready harness part # 118675 after tracking down what caused the...
    view full answer...
  • Does Trailer Wiring Kit for 2017 Volkswagen Tiguan Need to Run to Vehicle 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 which is what the # 118675 does. 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. I know it's super tempting to power the converter from an easy to access power source but doing so voids the warranty...
    view full answer...
  • Installation of Wiring Harness on 2012 VW Tiguan
    You should definitely not tap into the trunk's 12V power outlet when installing T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118675. The accessory 12V outlets were not designed to handle the additional load of a wiring harness and it will likely fail. I strongly recommend taking the time to run the lead to the vehicle's battery. I've added a link to a video showing this harness being installed on a 2012 VW Tiguan for you to take a look at as well.
    view full answer...
  • Instalación del conector 118675 en 2012 Volkswagen Tiguan
    Adjunto el enlace a las instrucciones de instalación del arnés de cableado del vehículo T-One # 118675, así como un video de instalación. Es compatible con un Volkswagen Tiguan 2012, por lo que solo debe enchufarlo a los arneses que están detrás de las luces traseras de su vehículo.
    view full answer...
  • Can 12 Volt Outlet be Used to Power Trailer Wiring Harness on a 2014 Volkswagen Tiguan
    Trailer wiring harnesses that require a direct connection to the vehicle battery, such as # 118675 for the 2014 Volkswagen Tiguan, must only be connected to the battery. There are a few reasons for this. First, if installed in any other manner other than what is outlined in the instructions will void the warranty. Second, the idea of getting power from the battery is to minimize the amount of draw on the vehicle electrical system. Should there be a catastrophic short there is less chance...
    view full answer...
  • Trailer Connector Fit for 2017 VW Tiguan
    The Tekonsha # 118675 you referred to is designed for vehicles that aren't equipped with the tow package, but if it were to be used on a vehicle with the tow package, it would be a plug-and-play installation, as I've shown in the linked video. Installing this harness would provide lighting circuits for the trailer, and would bypass would simply bypass the 7-way. It's a bit unusual for a vehicle to have a factory 7-way trailer connector that isn't fully functional when the vehicle is delivered,...
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2014 Volkswagen Tiguan
    The TowReady T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118384 that you referenced is not a fit for the 2014 Volkswagen Tiguan. This 4-pole harness uses a standardized round U.S. Car Connector to plug in to the vehicle wiring and your Tiguan does not use this type of connector. Currently there is one confirmed fit for a 4-pole trailer wiring harness for your vehicle and it is a hard-wired type converter, part # 118675 from Tekonsha. This kit installs at the tail...
    view full answer...
  • Trailer Wiring Harness for a 2013 Volkswagen Tiguan
    For your 2013 Volkswagen Tiguan we have trailer wiring harness # 118675. It plugs in line with the vehicle tail lights and also connects to the battery to power the lights and help protect the vehicle electrical system. It does not use the factory tow package wiring plug to install. I have linked a video review for you.
    view full answer...
  • Trailer Wiring Harness for a 2013 Volkswagen Tiguan
    Trailer wiring harness # 118675 will just plug in line with the tail light wiring on your 2013 Volkswagen Tiguan and connect to the battery as well to provide power to the trailer lights. The harness provides a 4-Way flat trailer connector at the back of the vehicle. It is definitely a low cost alternative to the dealer parts and installation and the computer will not have to be reprogrammed. I have included a link to a video review of the harness, the installation instructions, and a...
    view full answer...
  • How Much Can You Tow Using Draw-Tite Hitch with 2013 Volkswagen Tiguan
    The Draw-Tite Max-Frame Trailer Hitch Receiver part # 75658 which is a fit for a 2013 Volkswagen Tiguan has a 3,500 lb towing capacity. That said, the rating is for the hitch only and the vehicle may be rated lower. If so, you'll have to abide by the lower of the two ratings. If the loaded weight of the trailer does not exceed the weight capacity of the trailer hitch or vehicle (whichever is lower) then you'll be good to go. Please note, you may also need the T-One Vehicle Wiring Harness...
    view full answer...
  • Trailer Wiring Harness Recommendations for 2018 and 2012 Volkswagen Tiguan
    For the 2018 Volkswagen Tiguan we have the Tow Ready 4-way wiring harness part # 118811 which is a confirmed fit and would work well. For the 2012 you'd need to go with the # 118675 which fits the older version. The part numbers are very similar with the only difference being that the 6 and 7 are switched. I only mention that so you don't accidentally order the same harness twice.
    view full answer...
  • Recommended Trailer Hitch and Wiring for a 2012 Volkswagen Tiguan
    According to my research, the 2012 Volkswagen Tiguan only has a 2,200 lb towing capacity and the 1997 Starcraft Spacemaster 1224 has a dry weight of 2,124 lbs so you will need to be mindful when loading the trailer. The trailer hitch that I recommend is the Draw-Tite Max-Frame Trailer Hitch Receiver part # 75658. This trailer hitch is a direct bolt-on fit for all US models. I have attached an install photo and video for you. Then for a trailer wiring harness, I recommend the T-One Vehicle...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch and Towing Capacity for 2012 VW Tiguan
    The Draw-Tite Class III Max Frame Receiver Hitch # 75658 referenced in your question is confirmed to fit your 2012 VW Tiguan and it does indeed have a towing weight capacity of 3,500 pounds. With that being said, a towing setup will always be limited by its weakest component. This means that if the vehicle itself has a capacity of 2,200 pounds, this is the capacity you will need to adhere to, even though the hitch is rated for more. This custom-fit hitch will use existing holes in your...
    view full answer...
  • 2014 VW Tiguan 4-Way Trailer Wiring Harness Recommendation
    I wish we had an OEM style trailer wiring harness for your 2014 Tiguan, but nothing we offer will fit that connector you described. We have a 4-way harness that will plug in line with the tailligths of your vehicle though. The part # 118675 will easily install by plugging inline with the taillight harnesses of the Tiguan that I described.
    view full answer...
  • Trailer Hitch Recommendation for a 2016 Volkswagen Tiguan
    For your Volkswagen Tiguan I would recommend the Draw Tite hitch part # 75658 which is a confirmed fit. This is a 2 inch hitch which is preferred over the 1-1/4 inch hitch size for a couple reasons. This size will have higher towing capacities and have more accessories made for it. I attached an install video for the hitch for you to check out as well. For trailer wiring you then would want the # 118675 which is a confirmed fit. Since you wanted to do some towing you might be interested...
    view full answer...
  • Is Trimming Required to Install a Trailer Hitch on a 2016 Volkswagen Tiguan R-Line
    Since your 2016 Volkswagen Tiguan R-Line does not have the removable fascia piece there will be some trimming required to install Draw-Tite trailer hitch # 75658. I have included a picture from the instructions that shows where and how much to trim. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball,...
    view full answer...
    Image 1 for
  • Current Output Capacity for Tekonsha 4-Pole Trailer Wiring Harness 118675
    4-pole wiring harnesses, which carry stop, turn and tail light signals, generally have a current output in the range of 2 to 4 amps in each of the stop/turn circuits and from 4 to 7.5-amps in the taillight circuit. These current ratings can vary by harness manufacturer and by vehicle year, make and model. The Tekonsha harness # 118675 which fits your 2016 VW Tiguan has a maximum output of 4.2- and 7.5-amps. On a 7-way RV-style trailer connector the 12V auxiliary power circuit will usually...
    view full answer...
  • Taillight Removal for 2017 Volkswagen Tiguan for Trailer Wiring Install
    If you fast forward to the 1:50 section of the attached video link (probably have to scroll down to see it), you'll see our installer pry the head light lens off with a trim panel remover like part # ALL648544.
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring For 2016 Volkswagen Tiguan R-Line
    I recommend Curt Trailer Hitch Receiver part # C13133 for your 2016 Volkswagen Tiguan R-Line which is a 2" receiver. It does require a fascia cut out for installation. I have attached an installation video and snip from the instructions that show the amount of fascia trimming required for the R-line. If you need wiring, I recommend T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118675. I have attached an installation video for your reference.
    view full answer...
    Image 1 for
  • Installation of Tekonsha Wiring Harness 118675 Power Wire for 2017 VW Tiguan
    It is not recommended to use a different power supply for the Tekonsha Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness # 119190KIT. The 12V power wire is designed to be run directly from the battery to ensure correct voltage and correct amperage while avoiding the vehicle fuses and relays. Although it is possible that rear power supply could work, it has not been tested for that application so it is not recommended. For your 2017 VW Tiguan, I recommend using the...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
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Employee Jameson C
Expert Research:
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Employee Adam R
Expert Research:
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Employee Andrew K
Video by:
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Employee Lindsey S
Edited by:
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Video Edited:
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Employee Cole B
Installed by:
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Employee Wilson B
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Employee Alexander C
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