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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 # 118811
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118811 - 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. Powered ModuLite reduces strain on wiring system. Call 800-298-1624 to order Tekonsha custom fit vehicle wiring part number 118811 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.
  • All Info
  • Reviews (34009)
  • Q & A (13)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118811

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Tekonsha
  • Powered Converter

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 in rear cargo area
    • 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: 5 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 in the rear cargo area. You will have to remove the plastic threshold cover, side panels, and cargo trays to access this harness.


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 in 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.


ModuLite Power Module

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.



118811 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118811 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 - 118811

Average Customer Rating:  4.8 out of 5 stars   (33947 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.

- 118811
by:

The overall fit was excellent and instructions well detailed. The only issue I had was the vehicle well nuts shifted slightly making it somewhat difficult to initially get the bolts back in. There were access holes in the frame to help realign the nuts.



- 118811
by:

Excellent product, almost all plug n play. Clearly gaining access to the connections and running the primary to the battery are the biggest obstacles. Watch the videos and read the reviews before you buy. If it sounds beyond your skillset it probably is. For me, popping the panels proved easy. I managed to not break anything. All the provided wiring reached where it was supposed to. I followed the advice of another review suggesting that the primary be run thru the vehicle cabin along and under the trim. Then I found an access hole in the engines firewall where other wires passed thru a rubber grommet. I actually uncurled a metal hanger, guided it thru from cabin to engine compartment, connected the provided primary wire and pulled it back thru. My vehicle’s underbody has a full length cover/shield, which without a lift would have been awful to deal with. Again, excellent product.



- 118811
by:
2021 Volkswagen Tiguan

Your company did good. Instructions leave some to be desired.



- 118811
by:

Self-installed with help from the videos on the etrailer website. Still working great!



- 118811
by:

Product shipped quickly, arrived on time and in great shape. Hitch was super easy to install and the etrailer.com instruction videos were clear and helpful. Very satisfied with the purchase and service from etrailer.com



- 118811
by:

Seems to work as advertised. Seems to be a quality product Install was a bit of a hassle but not too bad. I recommend watching the video for the CURT wiring. Easier to follow than the fuzzy pictures and less than perfect printed instructions that came with the Tekonsha harness.



- 118811
by:

Very easy to install, plug and play. I ran the wire to the battery through the interior of the car and through the firewall. A lot cleaner and pretty simple. There’s a plug in the firewall where the clutch pedal would be, made it easy



- 118811
by:
2020 Volkswagen Tiguan



- 118811
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- 118811
by:
2019 Volkswagen Tiguan



- 118811
by:



- 118811
by:
2018 Volkswagen Tiguan



- 118811
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- 118811
by:
2020 Volkswagen Tiguan

Everything came perfectly packaged and installed relatively easy. I don’t have the equipment at home that they have in the videos on the website.



- 118811
by:

Wiring took about 40 minutes to complete



- 118811
by:
2020 Volkswagen Tiguan

Best source for rv accessories, I recommend them to everyone



- 118811
by:



- 118811
by:
2019 Volkswagen Tiguan

Easy install and great product!



- 118258
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Product quality very high, delivery very fast, shipping container (cardboard box) was not strong enough to support handling/shipment, box bottom was ruptured with hitch assembly hanging out, box should be supported stronger, no parts missing, hitch was scratched up somebut, nothing that a little black paint didn't fix. I installed the wiring harness connections and fuse box on the external side of the vehicle to eliminate having to take apart the internal sheet metal panels and providing easy access to the fuse in the event of fuse failure, this eliminates the necessity of interior Panel removal to change a fuse. Easy installation, product has great great design features ,great customer service with prompt delivery. Just ordered the bracket (#18140) to secure the 4 prong plug to the hitch neatly and secure to eliminate the loose plug. (not shown in photos (Bracket in transit),


Comments
Great, works like a charm.
Anthony J - 09/27/2020


- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


I purchased this for my 2013 Honda Pilot EX-L. I have not used the wiring harness yet, but the installation was extremely easy and quick. The instructions were very straightforward, and I was able to install everything within 30 minutes. Everything you need is inside the package except some bolts/nuts to mount the connector. I decided to cut out a hole and drill some holes for bolts. I opted for some black ones to match the colors. I'm extremely happy with this product and etrailer's fast and reliable service.



- 118252
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Just installed Draw Tight hitch, wire assembly along with the brackets for a nice look. Everything went smooth with installation and it has a nice clean look as the hitch is well hidden. This is going to work for our bike rack and the cargo carrier I am now going to by. Now I can also get a small utility trailer to pull and haul stuff. I strongly recommend etrailer for all your needs as they communicated with me the whole way through and readily replaced a lock unit that somehow came without the key. Customer service is top notch.


Comments
Absolutely Fine!
Scott N - 04/26/2020


- 118248
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Wish I bought etralier's tow harness earlier. Easy installation. Toyota dealership sold me the wrong one and of course waited too long to return. But use some of the parts from that harness on the one from etrailer(see pics). Would order again from etrailer. Thank you



- 118264
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


This is a perfectly tailored product for the do-it-yourselfer who with a little help adds a nice hitch to his vehicle. Getting an older vehicle's OEM installed weld nuts clean takes most of the time followed by installing the two washers and nuts in the fascia area. That part needs patience as the work area is limited. The Curt LED 4-Way Flat Connector (Vehicle End) Tester makes it very simple to verify the Tow Package - 4-Pole Flat Trailer Connector that is a snap to install to the vehicles pre-existing harness. One point to pay attention to in the instructional video is when pulling the square washer and bolt through the channel. They must slide in single file as shown. If you try to pull with the bolt through the washer it will get stuck and you will need to fish it out. So bottom line. Great product. Great support. Steve Stewart


Comments
Everything from the hitch to the wiring still works perfectly. Very pleased with the results
Stephen - 05/07/2020


- 118269
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Plug & play for 2020 Kia Sorento. Dinged a star because the trailer connector does not fit the extra bracket well. It does not appear to have been designed for a bracket mount. I had to force fit and secure in place with a zip tie.



- 118265
by:

Review from a similar T-One in Custom Fit Vehicle Wiring


Needed a harness for my 2015 Honda Pilot LX and didn’t want to pay a king’s ransom for dealer parts and install. Ordered from etrailer and got a deal. Came with everything I needed and also had excellent, easy to understand instructions. Works perfectly.


Comments
This harness has worked like a charm. No problems at all.
Randy B - 06/01/2020

32
3650
Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Help Accessing Taillight Housing Connectors for Installing Trailer Wiring 2018 Volkswagen Tiguan
    I attached a picture that shows how the very similar Curt trailer wiring harness part # C56403 installs which has a better set of instructions for accessing the taillight housings than the Tekonsha kit part # 118811.
    view full answer...
    Image 1 for
  • Is Installation of T-Connector Wiring the Same as T-One Wiring for a 2019 Volkswagen Tiguan
    The installation video and instructions for the Curt T-Connector # C56403 and Tekonsha T-One # 118811 are essentially identical. There might be slight differences but you could easily install one brand with instructions from the other brand no problem. You can definitely use the install video from the Curt (linked to this answer page) to install the Tekonsha on your 2019 Volkswagen Tiguan. If you don't already have a trailer hitch then I recommend using the Curt Trailer Hitch Receiver...
    view full answer...
  • Help Locating Connection Points For Trailer Wiring Harness For 2020 Volkswagen Tiguan
    I am happy to assist you in finding the correct tail light connection points for your 2020 Volkswagen Tiguan Tekonsha wiring harness part # 118811. I have attached a snip from the installation instructions of the Curt wiring harness (which installs the same) that explains more thoroughly how to find the connection points. They are located in the rear cargo area of the Tiguan underneath the panel pointed out in the attached photo. There is some trim panels that need to be removed first....
    view full answer...
    Image 1 for Image 2 for
  • Is There an Alternative to Connecting a T-One Trailer Wiring Harness to 2020 VW Tiguan Battery?
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118811 should be connected directly to the vehicle battery. This protects your vehicle wiring and it make sure you don't end up with a blown fuse or short circuit. The module draws 7.5 amps per circuit for the tail lights and 5 amps per circuit for stop/turn lights. The battery powers the module which in turn powers the trailer lights. It keeps the module and trailer from drawing power from the vehicle turn/stop...
    view full answer...
  • Where to Run Trailer Wiring Harness Power Wire on a 2018 Volkswagen Tiguan
    There is no one specific way to route a power wire from a trailer wiring harness such as # 118811 to the battery on a 2018 Volkswagen Tiguan. It all depends on how you want to route the wire. I have written a help article on this subject with tips on routing the power wire which I have linked for you.
    view full answer...
  • Factory WIring Compatible Trailer Wiring Harness for 2020 VW Tiguan
    The Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118811 is an aftermarket wiring harness confirmed to fit your vehicle by the manufacturer. This means it has been tested physically on that model and confirmed to work as designed. It has been confirmed to fit 2018-2020 VW Tiguan as well as 2019-2020 Tiguan Limited models. It draws power directly from your vehicle battery so it doesn't compromise the factory wiring but rather just captures signal. This is...
    view full answer...
  • Can the Rear 12 Volt Cig Outlet Be Used To Install T-One Vehicle Wiring Harness On 2019 VW Tiguan
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118811 is an excellent option for a 2019 Volkswagen Tiguan. In regards to installation, the power wire must be run to the battery as specified in the installations. The rear cigarette lighter outlet cannot be used for this purpose as it does not have the proper rating.
    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...
  • 7-Way Trailer Wiring for 2018 Volkswagen Tiguan
    To add a 7-way to your 2018 Volkswagen Tiguan you need to add a 4-way connector # 118811 and after adding a 4-way you can convert it to a 7-way with # ETBC7 which is a universal 7-way wiring kit. The 7-way has to have the 4-way to work. I have attached an install video to help you through the installation process. I also recommend picking up a brake controller since you're already going to be doing a lot of wiring it is going to make life a lot easier down the road. Tekonsha # 39510...
    view full answer...
  • Best Hitch Recommendation for a 2019 Toyota Highlander
    For your Highlander I recommend the etrailer.com Trailer Hitch Receiver - Custom Fit - Matte Black Finish - Class III - 2" part # e98844. This hitch has a really nice matte black finish on it that holds up against the element really well when compared to the others available. It offers a 900 lb. tongue weight rating and a 6000 lb. gross trailer weight rating. You can use weight distribution if you have that need which brings the rating up to 8000 lb of gross trailer weight. This exceeds...
    view full answer...
  • Trailer Hitch and Wiring that Fits 2021 Volkswagen Tiguan R-Line
    We have a Draw Tite hitch that fits your 2021 Volkswagen Tiguan R-Line with the part # 76192 which is also mostly hidden. Then for trailer wiring you'd want the Tekonsha kit part # 118811 and you'd be set. This is the easiest to install and most reliable option for your vehicle. 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 4 inch drop....
    view full answer...
  • Will Draw-Tite Trailer Hitch Receiver Interfere With Auto Lift Gate Sensor On 2021 Volkswagen Tiguan
    You are correct that Draw-Tite Max-Frame Trailer Hitch Receiver # 76192 is a confirmed fit for your 2021 Volkswagen Tiguan. I reached out to Draw-Tite directly and my contact mentioned that they have not heard of any issues from customers who installed the Draw-Tite # 76192. With the hitch installed you may have to move your foot to either side of the receiver to find the sweet spot, and just remember where that location is, but after doing it a few times it will become second nature. If...
    view full answer...
  • 2020 Tiguan 4Motion Towing Capacity
    With the vehicle towing capacity of 1,500 pounds, you should not exceed that weight. This could cause a failure and would most likely void the warranties on both the vehicle and trailer. So yes, the 100 pounds definitely makes a difference. If you are indeed going with this model trailer, then you would want to travel with the tanks empty and as much weight removed as possible. The electric brakes will not help with towing capacities, but definitely helps with stopping. To get those...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?




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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Sarah W
Updated by:
Sarah W
Employee Alexander C
Written by:
Alexander C

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