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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

Item # 118490
Our Price: $36.04
You Save: 23%
Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118490 - 4 Flat - Tekonsha
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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 - no cutting, splicing or tapping required. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118490 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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  • Reviews (69)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118490

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No 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 - no cutting, splicing or tapping required.


  • 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 - no cutting or splicing of wires
    • Locate connection points behind tail lights
    • Plug in T-connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage: 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 installation is complete, the 4-way flat connector will be stowed within the jack storage compartment of your rear cargo area.

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.

118490 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118490 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 - 118490

Average Customer Rating:  4.7 out of 5 stars   (69 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 - no cutting, splicing or tapping required.


Proper fit and clear installation instr uctions


Tammy P is the very best customer service Representative I have ever had - Please promote this Wonder Woman

Thank you Tammy P for such a wonderful experience, especially when the first one who helped me when I received the wrong product told me to sell it on e bay since she couldn’t refund me or return the unused product

I’m glad I called back and Got Mrs Tammy P
She made things right - very satisfied customer

I will return like I always do

2012 Volkswagen Routan

Great servide


It cannot get any easier

2011 Volkswagen Routan

Excellent product and took me no time to install hitch and wiring harness (probably about a hour to do both). The youtube videos on the installation were perfect and streamlined the process. The only negative thing, is that on the wiring harness the green wire going to passenger light was a little short, not providing a good length of harness to go out van gate. It hangs out about 1' of the very left, but most trailers have plenty of extra cord to reach the adapter. Worked perfectly, installed perfectly and would totally recommend!!!!


It seems that more and more lately I notice how badly customer service is suffering. Many companies don't consider it a top priority. is a HUGE exception to that. They were in contact with me every step of the way, letting me know as the order progressed through each step. They provided MUCH quicker shipping than I had expected (or paid for). The product is excellent. The hitch was very easy to install. Once you have all of your tools ready it is a 30-40 minute job if taking your time.
The wiring seemed like it was going to be more challenging, but once I began and just followed the instructions it took between 20-30 minutes.
I could not be more pleased with this transaction. Not only will I use for everything I can, but I will suggest them to anyone requiring a product that sells.
THANK YOU for excellent customer service and for an excellent product.


One of the easiest DYI projects ever. Took about 45 minutes and I took my time. The instructions said the ground wire was on the paasenger side, but it was on the driver's side. I watched the video, and followed that as a guide

2012 Volkswagen Routan

Hitch and wiring harness arrived quickly. Easy install exactly as depicted in the videos. The shipping box was pretty mangled, but no damage to the hitch.


following the instructions on video the installation was a breeze. my only problem was that although I put the ground screw where the video showed the green wire was mounted the ground wire was about 2' shorter than the 4 wire. that kept the plug too short to reach the trailer. my fix was to splice a wire to extend it to match the 4 wire and now it works great.


The hitch was easy to install and great quality. I got the wiring harness, too, but that was not so good. Didn't seem to be the right thing - wasn't long enough.


Direct fit for my minivan I never thought for one minute I would find the wiring harness to tow my camper. The family can't wait Thank you
P.S. Great Price Too

2011 Volkswagen Routan

Fast shipping and great communication! Product was super easy to install. I had no issues with the length of the wiring harness. The instructional video was tremendous and easy to follow to ensure a successful installation! Will definitely order from etrailer again!

2009 Volkswagen Routan

Service was great, shipping was quick, and the harness installed in less than an hour with easy to follow directions. I would have given it a rating of 5 if the wiring was longer. The plug needs another 2' of wiring to reach the hitch even with the wiring fairly taut. I will have to buy an extension... Not really a big deal but probably should be included for the price.


I ordered it, then it arrived. What more can you say about a wiring harness. I will add that this website has some really helpful install tutorial videos...really saves time when installing hitches and wiring harnesses.

2011 Volkswagen Routan

This hitch fits really well, and is very unobtrusive. Easy to install, I just drove my back wheels up on some ramps and had all the access I needed. Best of all was the VERY fast free shipping. Promised I'd have it by Friday and I had it Thursday afternoon, which took all the pressure off trying to install it just one day before my trip. Thank you!

2010 Dodge Grand Caravan

Product worked perfectly on our 2010 VW Routan. Really simple plug and play as advertized. The video instructions were great for running wires etc. Unlike most Routan parts, this one has different plug ends from the Grand Caravan and has to be specific to this vehicle.

2012 Volkswagen Routan

Decent instructions, although an online video like for the hitch would be even more helpful. This part took longer than installing the hitch, but only a couple of hours. All wires are hidden and it works great!

2010 Volkswagen Routan

Product was very easy to install and fit perfectly. Awesome customer service, George reached out to me to make sure everything worked good. I needed expedited shipping and George took care of it and had it to me in plenty of time. Will definitely order from again.

2010 Volkswagen Routan

very simple and easy installation, harness works great !


For 2012 , the green wire needs to be 24 inches longer. had to splice in order to get 4 wire connector to reach bumper.


Great product - easy installation - has lasted strong this past year towing my motorcycle trailer. Would highly recommend.

2011 Volkswagen Routan

Instructions were detailed and fairly simple to install. wish the cable with the trailer plug were a little longs but otherwise very satisfied with the product.

2011 Volkswagen Routan

Top notch material, and installation. Took less than 10 minutes to install, secure, and attach to trailer. Works splendidly without any issue.

2010 Volkswagen Routan

Product was very easy to install. Only wish the packaging came with a little bit larger of zip ties.


The wiring harness is a perfect match for my vehicle.

Show More Reviews

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

  • How to Remove Rear Taillights on a 2012 VW Routan to Install Tow Ready Trailer Wiring # 118490
    You removed the correct bolts already, it looks like on your vehicle the bolts where regular hex bolts and not the Torx bolts. The next step is to gently pry the light assemblies rearward away from the vehicle being careful not to break the alignment tabs.
    view full answer...
    Image 1 for
  • Where To Connect The Tow Ready T-One Wiring Harness # 118490 On A 2010 Volkswagen Routan
    To install the Tow Ready T-One Wiring Harness, part # 118490, on your 2010 Volkswagen Routan you will plug the T-One connectors into the back of your tail light connectors. The T-One connector with the yellow wire will plug into the back of the tail lights on the drivers side and the T-One connector with the green wire will plug into the back of the tail lights on the passenger side. The separate white wire will need to be grounded to a good, clean piece of metal like the vehicle frame....
    view full answer...
  • Recommended Trailer Wiring For A 2010 Volkswagen Routan
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part # 118490, is compatible with your 2010 Volkswagen Routan. The Curt option, part # 118534, will not work for your vehicle. I have included a product description link and a video installation of this 2010 Volkswagen Routan.
    view full answer...
  • Trailer Hitch Recommendation for a 2011 Volkswagen Routan
    When determining the overall towing capacity of a vehicle you must always go with the lowest rated component in the system as the overall capacity as a towing setup is only as strong as the weakest component. This is especially true if the weakest component happens to be the vehicle as that's the only component that can't be swapped out for a higher capacity component. The Draw-Tite part # 75579 is confirmed to fit your vehicle and has more capacity than you will be able to use. The...
    view full answer...
  • Trailer Wiring Harness Recommendations for a 2013 Volkswagen Routan
    There is a strong chance that the part # 118490 that would normally fit a 2012 VW Routan would also fit your 2013. The reason it's not listed as a fit for your 2013 model is because the 2013 Routans were made in very limited numbers. Only 2,500 fleet Routans were made in 2013. What that means is that due to the rarity of the 2013 models Tow Ready never was able to get their hands on one to test. So the only harness they list as a fit is a universal fit harness like part # 119147KIT.
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2011 Volkswagen Routan
    For your 2011 Volkswagen Routan the Draw Tite hitch part # 75579 is a confirmed fit and will be a great option for a hitch for your vehicle. For trailer wiring you'd then want the part # 118490 which is a confirmed fit as well. I attached an install video for this kit for you to check out as well. Since 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...
    view full answer...
  • Recommended Trailer Hitch for a 2011 Volkswagen Routan
    The Draw-Tite Trailer Hitch Receiver # 75579 is a confirmed fit for your 2011 Volkswagen Routan and is a trailer hitch that I recommend for your vehicle. The hitch is confirmed to fit all models of the Routan, including those with Stow and Go seating. It has a Class III rating and has a 2 inch receiver opening which will allow for a variety of hitch accessories. The Maximum Gross Trailer Weight is 4,000 lbs and it has a Maximum Tongue Weight of 400 lbs. Keep in mind that you will need...
    view full answer...
  • Installation Instructions for Custom Trailer Wiring for a 2009 and 2010 Volkswagen Routan
    In order to use the reverse lights on your trailer, you will need to add a 4-Way to 5-Way adapter like # 47515. Using a circuit tester, like # PTW2993, find the wire behind your taillight assembly that carries the reverse light signal. It will have a signal when the vehicle is in reverse. Make sure you have someone in the vehicle to help you and put the emergency brake on for added safety. After you have found the reverse light wire, you can connect it to the Adapter 4 Pole to 5 Pole Trailer...
    view full answer...
  • Parts Needed to Wire a 2012 Volkswagen Routan with a 7-way Socket for Trailer Brake Operation
    If you already have a 4-pole flat trailer connector on your 2012 Volkswagen Routan, such as the plug-and-play Tow Ready # 118490, then to install a trailer brake controller you'll just need to add our trailer brake controller installation kit # ETBC7. The ETBC7 includes all the related parts you'll need to install a trailer brake controller such as the reliable and popular Tekonsha Prodigy P2 # 90885. I have linked both a video and article that cover the process of installing the ETBC7....
    view full answer...
  • Recommended Ball Mount for Towing a Trailer with a 2012 Volkswagen Routan
    The Draw-Tite # 75579 along with the Tekonsha Wiring Kit # 118490 are excellent options to use for getting your 2012 Volkswagen Routan ready to tow. I have attached installation videos for each on a similar Routan for you to reference. If you check out the video for the Draw-Tite # 75579, we found that when we installed it on a 2012 Routan that the distance from the ground to the top of the receiver opening was 12-1/4 inches. If the bottom of the coupler on your trailer measures 18 inches...
    view full answer...

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Info for this part was:

Employee Michael H
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Jeff D
Employee Jameson C
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Employee Adam R
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Adam R
Employee Joshua S
Video Edited:
Joshua S
Employee Chris R
Video Edited:
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Employee Laura H
Updated by:
Laura H
Employee Wilson B
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Employee Isabelle B
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