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  1. Custom Fit Vehicle Wiring
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  4. Trailer Hitch Wiring
  5. 4 Flat
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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 # 118668
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118668
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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. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118668 or order online at etrailer.com. 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 (19)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118668

  • 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
    • 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


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 lower interior trim panels and the tail light assemblies to access this harness.


Tail light 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 flat connector will be stowed within the 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. Because your vehicle runs on a multiplex wiring system, the wiring needs to be converted to be 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.



118668 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Replaces 118531

Installation Details 118668 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 - 118668

Average Customer Rating:  4.8 out of 5 stars   (19 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:

I received the shipment timely and the updates while in transit were excellent. However, the shipment had minimal packaging and was in bad shape when it arrived. Fortunately, there does not seem to be significant damage to the hitch and I located all of the parts for the wiring kit.




by:

As far as vehicle installations go, this went about as smooth as possible. Even if you are only slightly mechanically inclined, you should be able to tackle this install. All of the connectors fit right up on my vehicle as expected. Nothing unexpected. The How-To video was VERY helpful and guided me the entire way. 10/10!




by:

Easy to install and continues to work after extensive use.




by:

The wiring was exactly as advertised and fit perfectly.




by:

Worked great! Easy instal and most likely saved me a bazillion dollars not going to the dealership. Great installation videos also. Thanks!




by:
2014 Volkswagen Touareg

I installed this wiring harness at the same time I installed a hitch on my VW Touareg. The video provided online was a huge help and complimented the very detailed, application specific instructions provided. There was only 1 part that I thought could be more specific and that was when it came to getting the long black wire that gets routed to the engine compartment, out of the rear of the vehicle. I ended up popping out a round rubber gasket from the wheel well and routing the wire out there. The video indicates that you can feel around and find a "vent" for the wire to exit through. Either way, I was able to get everything connected, and even though it took a bit of time, it was relatively simple. I'm only "handy" not a mechanic or electrician, but after watching the video I realized that this would be pretty simple and wasn't anything that I couldn't handle.




by:

Order was lost during shipping etrailer Still provided great service given the circumstances. I’ll definitely purchase from them again.




by:
2013 Volkswagen Touareg

I purchased a trailer wiring kit for a 2013 VW Touareg. It was the easiest trailer wiring Kit that I have ever installed. etrailer.com has complete & easy to follow on line instructions. The best part is that the kit, 118668 has tail lite plug adaptors for a quick and EASY connection.




by:

Very easy to install with instructions and video showing how to do. Need to have some mechanical and electrical knowledge thou to complete this work.




by:

This was an easy install; especially with the helpful installation videos provided by E-trailer.




by:
2014 Volkswagen Touareg

Works well, fairly simple install. Be careful to not drop the right hand tail light retaining screw, definitely adds time to the install!




by:

Nothing but quality!! All you need to complete the wiring for your trailer.




by:
2014 Volkswagen Touareg

this is by far the easiest trailer light kit i have installed, i highly recommend this kit!




by:
2012 Volkswagen Touareg

The product worked as expected and the video by etrailer on youtube was extremely helpful. And, the package arrived quickly.




by:
2011 Volkswagen Touareg

Easy install, works great. The video walk through made the job even easier




by:
2013 Volkswagen Touareg

Delivered quickly as promised. Installation was easy. Highly recommend.




by:

Thank you so much, for fast delivery, and exactly what I ordered. Thank you!!




by:
2012 Volkswagen Touareg




by:



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



  • Does Computer have to be Flashed to Install Trailer Wiring Harness on 2013 VW Touareg
    T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118668 plugs in line with the tail light wiring on your 2013 Volkswagen Touareg and not to any factory tow package wiring so the vehicle computer would not have to be flashed. However, if VW has a special software update that enables the vehicle for optimum performance when towing then it is a good idea to do it especially if it alters the transmission shift points to work best when towing!
    view full answer...
  • Amperage Draw of Tekonsha Trailer Wiring Kit For 2012 Volkswagen Touareg
    The amperage rating for the Tekonsha trailer wiring harness part # 118668 that you referenced is 4.2 amps per each stop/turn circuit and 7.5 amps for the running light circuit. While I certainly understand how tempting it is to power the wiring kit from a more convenient circuit to access than the vehicle battery you really have to make sure you use the vehicle battery only as it's only method that won't void warranty. The reason it draws from the battery is so that it can totally bypass...
    view full answer...
  • Troubleshooting Driver and Passenger Turn Signal On Tekonsha T-One 118668 Not Working
    I would start with checking the white ground wire that got grounded to your 2014 Volkswagen Touareg, as this is a pretty common issue when a ground does not have a good connection. Make sure the ground is secured to clean corrosion free metal. Next remove both of the tail lights on your vehicle, and check that the pins inside of the connectors of the # 118668 are not bent or damaged. If all of those check out, use your circuit tester to check the yellow and green wires coming into the...
    view full answer...
  • Does Install of Tekonsha Trailer Wiring for 2012 Volkswagen Touareg Have Extra Steps for Hybrid
    The Tekonsha trailer wiring harness part # 118668 fits the 2012 Volkswagen Touareg hybrid models the same as the non-hybrid models with no extra steps or considerations.
    view full answer...
  • Left Turn Signal And Brake Lights Not Working On 2013 Volkswagen Touareg
    It sounds like it could be a weak ground. Check to make sure your grounding point on the vehicle is on a nice piece of metal that is clean and free of rust or paint. It is also a good idea to check the connectors coming off the vehicle with a circuit tester # 40376 to verify they are in proper functioning order and is receiving the correct voltage. I have attached a help article to aide you in your troubleshooting.
    view full answer...
  • Replacement Trailer Wiring Harness For A 2016 Volkswagen Touareg
    When it comes to replacing the trailer wiring harness on your 2016 Volkswagen Touareg The T-One Vehicle Wiring Harness # 118668 gives you a 4-flat connector. This harness will plug into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. I attached a picture of instructions on how to un-install the wiring. I attached an installation video link below.
    view full answer...
    Image 1 for
  • Trailer Wiring Harness to Fit 2011 Porsche Cayenne
    We do not have a wiring harness that plugs directly into the wiring of a 2011 Porsche Cayenne. The # 118668 that you referenced is for the Volkswagen Touareg but hasn't been confirmed to fit the Cayenne despite their similarities. The harness that will work with your Cayenne is # 119190KIT. This will be hardwired into the Porsche. I've linked videos the wiring harness being installed on the similar Audi Q7
    view full answer...
  • Trailer Wiring Harness for a 2011 Porsche Cayenne
    The 2011 Porsche Cayenne is one of those vehicles that is hard for manufacturers to get in order to perform test fits of things like wiring harnesses or other custom fit parts. This is the case with many high-end vehicles like yours and likely the reason that there are no T-connector type wiring harnesses available. To avoid having to cut and splice a wiring harness into the vehicle's tail light wiring I recommend ZCI Circuit Protected Vehicle Wiring Harness w/ 4-Pole Flat Trailer Connector...
    view full answer...
  • Recommended Trailer Wiring Harness for 2015 VW Touareg
    The Hopkins 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket # HM40975 referenced in your question is intended as a factory replacement. If your VW Touareg came with a factory 7-Way connector and you need to replace it, this item will work perfectly. Otherwise, if your vehicle does not have an existing factory connector at the rear bumper, I instead recommend the T-One Vehicle Wiring Harness # 118668. This custom-fit harness will install by connecting directly to the built-in...
    view full answer...
  • Troubleshooting Turn Signals Not Working Using T-One Wiring Harness on 2016 VW Touareg
    The Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118668 you referenced is a confirmed fit for your 2016 VW Touareg. Since you mentioned your turn signals are not working, I recommend you double check the installation and ensure you have a good 12V power connection to your battery and clean metal to metal ground to your vehicle frame or metal body support. I recommend using the circuit tester # PTW2993 to check each function. I've attached a video and an...
    view full answer...
  • Trailer Hitch Recommendation for 2011 Volkswagen Touareg for Towing Travel Trailer
    We have trailer hitches that fit your 2011 Volkswagen Touareg that have more than enough towing capacity for towing the travel trailer you mentioned like the Draw Tite # 75950 but none of the hitches we offer for your vehicle can be used with a weight distribution system as they were not rated for this application. So you'd still be able to tow your trailer but not be able to use the WD system. For trailer wiring you'd want the part # 118668 which is a custom fit kit for your vehicle and...
    view full answer...
  • Troubleshooting Taillights for Trailer Wiring on 2012 Volkswagen Touareg
    I have attached the installation instructions for # 118668 below. I do recommend using a Circuit Tester # PTW2991 for testing your connections. This will help ensure your ground connectors are working properly as well. I do not see a black wire with green tracer coming out of the black box. The black wire is the 12V constant power. Your output wires are green for right turn/brake, yellow for left turn/brake, brown for running lights and white is ground. I hope this will help you identify...
    view full answer...
  • Trailer Wiring Harness for 2013 Porsche Cayenne
    The # 119179KIT harness you mentioned isn't vehicle specific, but it could be installed by tapping into the taillight wiring harness of your Cayenne. When the vehicle in question is a European vehicle like the Cayenne, I'll typically recommend going with the # 119250KIT. Instead of physically tapping into the vehicle wiring, the # 119250KIT uses sensors that snap around the individual brake lamp, turn signal and running lamp circuits without piercing the wire. Even though the wire insulation...
    view full answer...
  • Installation of Tekonsha P3 Brake Controller on a 2012 Volkswagen Touareg
    It sounds like you do not have the factory installed 7-way on your 2012 Volkwagen Touareg. To install a brake controller like the Tekonsha P3 # 90195 you will need a 4-way wiring harness installed and then to gain the proper brake controller functions you will need to adapt the 4-way to a 7-way. The 4-way I recommend for your Touareg is # 118668. We do have an installation video of this being installed on your same vehicle. To adapt this to a 7-way, I recommend the # ETBC7, this kit...
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring Recommendation for a 2015 Volkswagen Touareg
    For your 2015 Volkswagen Touareg we offer a hitch and wiring solution that would be MUCH less expensive than what the dealer wants to charge you. For a hitch the Curt part # C13116 is a popular option that would work very well for you. I attached an install video for you to check out as well. If you wanted to do some towing you might be interested in 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...
    view full answer...
  • Trailer Wiring for 2012 Volkswagen Touareg for Installing Brake Controller
    The correct 4-way trailer wiring harness you'd need for your 2012 Volkswagen Touareg is actually the part # 118668. 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. Then for a brake controller you could use the # 39510 and you'd be set.
    view full answer...
  • Parts Needed to Install a Trailer Brake Controller on a 2012 Volkswagen Touareg TDI
    At this time, a plug and play type of brake controller wiring harness is not available for a 2012 Volkswagen Touareg. But, you can still install a brake controller. There are several components you will need. First, if the vehicle does not already have a 7 or 4-Way trailer connector, you will need to add one. To add a 4-Way you will need # 118668. I have included a link to the installation details and a link to a video showing a typical installation of this harness for you. To then add...
    view full answer...
  • Wiring Harness for 2013 VW Touareg
    I am not 100 percent sure what you are asking in regards to plugging into the factory connector but I can tell you that there are two connectors that will fit your 2013 VW Touareg, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118668 and the Mighty Cord Replacement 7-Way RV-Style Trailer Connector for Factory Tow Package # A10-7072VP. The 7-way is simply a replacement connector for your VW's factory 7-way, if that is what you have. If you have no connector at all...
    view full answer...
  • Recommended Trailer Hitch and Wiring for 2012 Volkswagen Touareg for Towing Boat Trailer
    You will need just a few things to tow your small boat trailer with your 2012 Volkswagen Touareg and power the trailer's brake lights. First, if you do not already have a trailer hitch installed on your Touareg, I recommend the Draw-Tite Class III Max Frame Receiver Hitch # 75950. This hitch has a towing weight capacity of 7,500 pounds and a 750 pound tongue weight capacity. I have attached the installation details for you to check out. Next, for powering the trailer's signal lights,...
    view full answer...
  • Installing a Tekonsha Voyager Electric Trailer Brake Controller in a 2011 Volkswagen Touareg
    I've linked an article that you might find helpful on installing a brake controller in a Volkswagen Touareg like your 2011. I confirmed with Tekonsha that you will need to install a 12V, normally open relay. For the install: Obtain locally, a 12 volt, normally open relay. Connect the ground terminal (85) of the relay to a ground under the dash. Connect the trigger terminal (86) of the relay to pin #3 of the brake control connector. Connect the red wire from the brake control to the load...
    view full answer...
  • Brake Controller Installation 2014 Volkswagen Touareg
    If your tow package includes the factory 7-way trailer connector on the rear bumper, you'll need a few parts from the dealer. You'll need one #1J0-972-782 housing and (qty. 2) #000-979-228-E wire/terminal assemblies. I've linked to the tech bulletin that explains the procedure as well as to an install video showing how those VW parts work. I've also linked to a demonstration video explaining how the Spectrum Brake Controller works.
    view full answer...
  • Installing a Brake Controller on a 2011 Volkswagen Touareg Without a Factory Installed 7-way
    Since you indicated that you do not have a wiring bundle under the dash then you most likely do not have a factory installed 7-way towing package for your 2011 Volkswagen Touareg. To establish a 7-way that will activate through the brake controller you will initially have to establish a 4-pole connection then convert that to a functional 7-way, and finally properly install a brake controller. To install a 4-way on your 2011 Tourageg you will need to use the T-One Vehicle Wiring Harness...
    view full answer...
  • How to Change 4-Flat to 5-Flat on 2011 VW Touareg for Boat Trailer
    I am not sure if you have the 4-flat on your 2011 VW Touareg or not already, but if not you simply need to install the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118668. You will then be able to connect it to a trailer 5-way such as # HM47910 by using the Tow Ready 4 Pole to 5 Pole Trailer Wiring Adapter # 20036. All you need to do to install this adapter is plug one end into the 4-way on your VW and splice the blue wire to your Touareg's reverse light wire and you'll...
    view full answer...
  • Recommended 7-Way RV Trailer Connection for a 2014 Volkswagen Touareg
    The Hopkins 7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket, # HM40975, is designed to be installed on a vehicle that already has the trailer towing wiring installed. This will include the wiring to add a brake controller to your vehicle. If your 2014 VW Touareg has the OEM towing package, then the Hopkins trailer connector will allow you to attached the plug from your vehicle to the trailer connector. The plug will plug right into the back of the Hopkins connector. If your...
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Chris R
Video by:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
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Test Fit:
Jared G
Employee David F
Test Fit:
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