bing tracking image
  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 # 118754
lowest price pledge
Retail:$169.24
Our Price: $80.38
You Save: 53%
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Orders above $99 qualify for Free Shipping
Shipping Weight: 1.7 lbs
Quantity: 
In Stock
Tekonsha Custom Fit Vehicle Wiring - 118754
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
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 118754 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 (30)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118754

  • 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 point 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
  • Limited 1-year warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located in your rear cargo area. You will have to remove the threshold cover, cargo trays, and some interior paneling 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 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 multiplex-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.



118754 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118754 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 - 118754

Average Customer Rating:  4.3 out of 5 stars   (30 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:

eTrailer provides great video instructions, and those for this harness were no exception! Installed relatively easily and works very well.




by:

My experience with etrailer was nothing but phenomenal. The site was easy to use and supplied all of the technical information I required as a first time user. I am not a vehicle savvy person, but the instructional videos made me feel like one. All of the items that I purchased were exactly the quality that I was hoping for. Their customer service is excellent as well. I recommend etrailer to anyone that is in need of such any item they offer and will be using them again!




by:

Quality parts and speedy delivery. Great customer service. One item was missing the key and they sent a replacement immediately.




by:

Everything worked as expected and I am very happy with the quality of the materials




by:

Etrailer is the only place for anything trailer. The best. Puh




by:

Wiring works as advertised. Thanks e-trailer for a job well done. :)




by:

Works great. Not sure I like the fact that I have to run the power wire all the way to the front of the vehicle to the battery, but, it has been working fine.




by:

Fits with out cutting or modifying anything. Took awhile to figure out how to fish the bracket and bolt through the frame rail but after the 1st 1 the rest went quick. Would recommend and purchase again!




by:
Volkswagen

It’s been a year since I installed it on our 2018 VW Atlas and it is working great!




by:
2018 Volkswagen Atlas

Kit was very good, except that 4 conductor connector cannot be fed through existing opening in spare tire tray and must be cut. An enhancement would be to allow the connection of the 4 conductor lead to the 'control box' with a narrow connector that can be snaked through the existing rubber plug in spare tire tray.
Additionally the length of wire for the 4 conductor plug is too short. Resolved by purchasing another connector with wire and splicing.

Plug compatible installation for taillight harness is great.


Comments
Tekonsha purposely designs the wiring harness to be stored in the interior of the vehicle when it is not being used so that the trailer connector is protected from the elements. When the trailer connector is needed, it can easily be ran out the back of the vehicle, and the trunk or hatch lid can be closed on the wiring. The rubber gasket on the hatch is plenty thick enough to protect the wires, as long as you keep the wires away from the latch. Ive towed my PWC trailer for years this way with my van, and it works great.
-- Etrailer Expert Mike L - 04/14/2018


by:
Volkswagen

If you want plug and play you might as well spend $300 on the one from VW. In order to get what I would consider a proper install it took about 2.5 hours. The included instructions are 100% useless. Here are a couple notes:

1. If you run the hot wire underneath like the instructions say you will probably end up drilling a hole in the spare tire well to get it inside. You can run it inside under the kick panels he whole way back if you go through the main harness grommet in the fire wall.

2. Unless you want wires showing inside the back of your new car where this runs from one tail light to the other, you will either have to remove every interior panel in the back of your car (I couldn’t even figure out how) or cut this harness apart, fish the wires, and splice it back together.

Bottom line is, unless you are pretty mechanically capable you will either pay to have someone do this right or have wires strung all over the inside of your new Atlas. The only reason I gave this 2 stars is for the price.




by:

Dear Friends,

The major challenge
was that the bolt heads were too large to put in the bumper channel. The undercoating limited clearance. I Therefore ground down an eight of an inch (1/8”) Off the side of the bolt head. Painted the bolt head to prevent future rust.

It also was a challenge to thread the power wire from the rear connection to the firewall and battery by avoiding sharp areas and hot areas.

Other than those Two (2) challenges, that were Overcome with a little extra time and effort , it was pretty straight forward. I do wish that there was a 2020 Volkswagen Atlas video. But I thought of that a little too late!




by:

Great quality and easy plug-n-play inst all.




by:
2018 Volkswagen Atlas

Exact fit for my car (2018 VW Atlas) with easy to follow instructions that were vehicle specific.

Supplied power wire (runs from battery to brain box) actually long enough to reach both!

Trailer tail lights are brighter than when they leach off the tail light power due to the direct battery supply.

Overall very pleased.




by:
Volkswagen

If you have a 2018 Atlas, do not get this. The t-connectors work just fine, however the instructions are incredibly vague and provide you with no information on how to hide the wires inside the trim panels. There is also no mention on how or where to get the black power wire to the underbelly of the car. Finally, the black power wire provided is not long enough to reach from the back to the front battery. Major design flaw. I would not buy this if I were you. When I brought up these issues the expert told me the instructions were vague on purpose because it is supposed to work with multiple vehicles. However, the instructions that came with the wiring had 4 pictures specific to the Atlas and it also had Volkswagen Atlas printed on the instructions. The truth? The instructions are incredibly vague. I doubt anyone has even installed this successfully on a 2018 Atlas. Do not buy.




by:

The wiring harness worked perfectly. No complaints.




by:

Electrical unit was easy to install. Great directions and fit perfect.


Comments
Everything has been working properly. The unit was mostly easy to install and mount. There was a small issue with feeding a battery wire back to the unit, because WV does an excellent job of covering the undercarriage of the vehicle. But with a of perseverance, I was able to feed the 12 volt lead back from the battery. Thanks again Etrailer.
Joseph P - 02/02/2020


by:

Fast shipping great product easy to install I would recommend to everyone buy here first.




by:

Received it two days after placing order. All parts were there and of good quality. The instructions were clear and dummy proof. I give this product a 10. Thank you.




by:
2018 Volkswagen Atlas

easy plug and play install. directions easy to follow.




by:
2018 Volkswagen Atlas

Just as promised on time delivery. Top notch service.


Comments
Awesome no issues whatsoever
Jose - 07/07/2020


by:




by:




by:




by:
2018 Volkswagen Atlas



25
30
Show More Reviews

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



  • Install Instructions Recommendation for 2018 Volkswagen Atlas
    I attached a picture of the install instructions for the Trailer Wiring Harness part # 118754 for you to check out. I also attached a link to them below as well as a link to a page that has a help article on routing the power wire for harnesses like this as well.
    view full answer...
    Image 1 for
  • Tips for Running Trailer Wiring Power Wire to Battery on a 2018 Volkswagen Atlas
    Running the power wire to the battery for a trailer wiring harness such as # 118754 for your 2018 Volkswagen Atlas isn't actually all that difficult. It just takes time. While I do not know specifically where you would need to route the wiring on the Atlas there are some common methods for running a power wire. I actually wrote a help article covering this topic which I have linked below for you.
    view full answer...
  • Recommandation for the Best Hitch on the 2018 Volkswagen Atlas
    I recommend using the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" part # 76176. This is a very easy hitch to install and will serve you very well for years to come. It offers a 900 lb. tongue weight rating and a 6000 lb. gross trailer weight rating. Be sure to check your owners manual for the towing rating of your Atlas and exceed that. If wiring is needed i would go with Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118754....
    view full answer...
  • Trailer Wiring Adapter for Reverse Lockout on Trailer with Surge Brakes
    Does your 2018 Volkswagen Atlas already have a 4-way trailer connector? If so, use part # 20036 to convert it to a 5-way or part # 37185 to a 7-way. Both plug into a 4-way for the lighting functions and then need to be spliced into the VW's reverse light circuit. The 5-way has an extra wire for this and the 7-way uses the purple wire. This will engage your boat trailer's reverse lockout so you can back up without the surge brakes locking up on you. If your Atlas doesn't already have...
    view full answer...
  • Can the Wiring Harness for a 2018 Volkswagen Atlas be Mounted Outside the Vehicle
    Yes, you can mount the 4-way trailer connector of the T-One Vehicle Wiring Harness part # 118754 for your 2018 Volkswagen Atlas outside of the vehicle but in order to do this you would need to find an access hole. Once you do find the access hole you can then use both part # 18140 and part # 18144 to secure it to the trailer hitch. Unfortunately, I do not have any write-ups for this process as that is not how the manufacturer tests the wiring harness.
    view full answer...
  • 4-Way Connector Wiring For A 2019 VW Atlas
    I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118754 as an option besides the adapter you referenced to provide a standard 4-Flat. This harness is custom designed to fit your vehicle without splicing the factory wires. This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located in your rear cargo area. You will have to remove the threshold cover, cargo trays, and some interior paneling to access this harness. Once you've...
    view full answer...
  • How To Install a 7-Way Trailer Connector On a 2021 Volkswagen Atlas
    It sounds like you are trying to add a 7-way trailer connector to a 2021 Volkswagen Atlas and if that's the case we have some great options. That said, you'll have to start with a 4-way, the T-One Vehicle Wiring Harness part # 118754 is plug-in-play and I confirmed fit for you. This can then be adapted to a 7-way, the 4 to 7-Way with 4-Way Adapter part # ETBC7. It comes with a mounting bracket as well but I'm not sure of what bracket you have on the vehicle now.
    view full answer...
  • Trailer Hitch Receiver Fit For 2018 Volkswagen Atlas
    While we do have a trailer hitch receiver that fits your 2018 Volkswagen Atlas, the one you mentioned isn't a fit for this vehicle; the one that does fit which I recommend is from Curt: - Curt Trailer Hitch Receiver # C13366 This hitch will give you the best ground clearance from the bottom of the hitch, which can be particularly important if you are going to be using the hitch for accessories like a bike rack. Also, if you plan to use the hitch for towing as well and need a trailer...
    view full answer...
  • Recommended Trailer Hitch and Wiring For 2019 Volkswagen Atlas
    I recommend Draw-Tite Hitch Receiver part # 76176 which is a concealed cross tube hitch for the 2019 Volkswagen Atlas. The only part of the hitch that is visible once installed is the receiver. It also sits up a bit higher compared to the other options of hitches for better ground clearance. I have attached a photo for your reference. For the wiring, I recommend Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118754 which is designed to plug into the rear...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch Receiver For 2021 Volkswagen Atlas
    I recommend going with the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 76176. With a 900 pound max tongue weight it will be able to handle any accessory you want and if you need to haul a trailer at some point it can do that too. If you are going to be towing I suggest getting the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118754 and the etrailer Ball Mount Kit for 2" Hitches - 7,500 lbs # 989900. If you want accessories like a bike...
    view full answer...
  • Recommended 4-Way and 7-Way Wiring for 2022 Volkswagen Atlas
    In order to add a 7-way to your 2022 Volkswagen Atlas for your lights and brakes you will need to start by adding a 4-way. For that I recommend the Tekonsha T-One Vehicle Wiring Harness # 118754. This will plug into your existing wiring using the T-One connectors so no cutting or splicing is required. Once installed, you will have a 4-way connection that can power your trailer's signal lights and will be able to add the 7-way. For the 7-way you need the Universal Installation Kit for Trailer...
    view full answer...
    Image 1 for
  • Does Bumper have to be Trimmed to Install Curt Trailer Hitch C13366 on a 2018 Volkswagen Atlas
    I checked the installation instructions, linked for reference, for hitch # C13366. There is no trimming mentioned to install the hitch on a 2018 Volkswagen Atlas! 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, hitch pin with clip, and a storage bag. If the ball mount kit does not have the right...
    view full answer...
  • Trailer Hitch Recommendation for 2018 Volkswagen Atlas
    Only Volkswagen can give you confirmation on if there's a way to tow over 2,000 lbs with your 2018 Volkswagen Atlas. They might have components like a transmission cooler that's also needed to allow you to tow the higher amount of weight. Right now though we do have the Curt Class III hitch # C13366 as a fit for your Atlas that's overrated than what you currently have a capacity for. This actually has a 6,000 lb towing capacity. For trailer wiring you'd then want the # 118754 which is...
    view full answer...
  • Recommended Wiring Harness and Trailer Brake Controller for 2018 VW Atlas
    We have everything you need to set up your 2018 VW Atlas to connect with and power your trailer's brakes (along with its basic signal lights). If you do not yet have any wiring connector installed on your Atlas, you will need to start with a 4-Way connector. For this, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118754. This custom harness will install by plugging right into built-in ports located behind the trim panels in the cargo area on the driver and passenger side of...
    view full answer...
  • Trailer Hitch and 4-Way Wiring Harness Recommendation for 2019 Volkswagen Atlas
    The trailer hitch I recommend for your 2019 Volkswagen Atlas is the Curt hitch part # C13366 because it has the best towing capacities, is mostly hidden so it looks great installed, and also installs easier than other options. Then for trailer wiring the Tekonsha kit part # 118754 is the best option as it installs very easily and comes with a very reliable converter box which means it will be the most likely to resist damaging itself due to a trailer wiring short. Since you wanted to...
    view full answer...
    Image 1 for
  • Recommended Trailer Hitch for a 2020 Volkswagen Atlas
    The trailer hitch I recommend for a 2020 Volkswagen Atlas is the Curt Trailer Hitch Receiver part # C13366 which is a direct bolt-on fit that should only take around 30-40 minutes to install with just basic tools required so you should be able to do this at home, by yourself. The Curt hitch has a hidden design therefore you don't have to look at a bulky cross tube on the rear of the vehicle. I have attached an install photo to show this as well. If you will be towing a trailer then you'll...
    view full answer...
    Image 1 for
  • Best Wiring Harness for 2018 Volkswagen Atlas
    The best wiring harness for your 2018 Volkswagen Atlas is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118754 because we have found that the manufacturer, Tekonsha, makes the most reliable wiring harnesses in the industry. Additionally, I also highly recommend using Dielectric Grease for Electrical Connectors # 11755 to help prevent any type of corrosion in your connector; using it will increase your 4-way's durability and extend its lifespan. I can also confirm...
    view full answer...
  • Best Trailer Hitch Receiver and 4-Way Wiring Harness For a 2021 Volkswagen Atlas
    For your 2021 Volkswagen Atlas I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 76176. This will only fit all trims with the exception of the Cross Sport. This is a class III receiver that has a 2" opening with a maximum tongue weight rating of 900lbs and maximum trailer towing capacity of 6,000lbs. Be sure to not exceed the maximum tow rating given by Volkswagen for your Atlas. The Tekonsha T-One Vehicle Wiring Harness # 118754 is the wiring harness that I recommend using...
    view full answer...
  • Comparing Curt 2 Inch Trailer Hitch Receiver to Draw-Tite 2 Inch Receiver for 2019 VW Atlas
    For your 2019 VW Atlas, the Curt Trailer Hitch Receiver # C13366 will be about 1-1/2 inches recessed behind your bumper and will drop 8.44 inches from the frame mount to the bottom of the receiver tube according to my tech contact at Curt. The Draw-Tite # 76176 will have the receiver tube extend about 6-1/2 inches from the rear mounting hole and will drop 8.8 inches from the frame mount to the bottom of the receiver tube according to my tech contract at Draw-Tite. So they will give you...
    view full answer...
  • Custom 4-Way Wiring Harness for a 2022 VW Atlas
    Yes, the Tekonsha T-One Vehicle Wiring Harness item # 118754 will fit a 2022 Volkswagen Atlas. However, it will not fit the Cross Sport model. To tow with your Atlas you will also need the Draw-Tite Max-Frame Trailer Hitch Receiver item # 76176 and the Curt Towing Starter Kit for 2" Hitches item # C45534.
    view full answer...
  • Installation Instructions for T-One 118754 Explained for a 2018 Volkswagen Atlas
    We certainly understand how frustrating manufacturer's installation instructions can be which is why we shoot our own installation videos and take our own install photos. We haven't had the chance to install a trailer wiring harness, like the T-One Harness # 118754, on a 2018 VW Atlas yet so I don't have any specifics for your vehicle, but I'm happy to give you some tips to clear up as much as possible. Up until Step 6 or "Routing the Green Wire" the instructions are pretty clear. To route...
    view full answer...
  • Recommended Brake Controller for a 2018 Volkswagen Atlas
    For a brake controller that will work well with your 2018 Volkswagen Atlas, I recommend taking a look at the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195. The Tekonsha P3 is one of our best selling brake controllers due to its built in safeguards and ease of use. Unfortunately, a plug and play brake controller wiring harness is not available for your Atlas at this time therefore, the only way to install the controller would be to hardwire it directly to your vehicle's wiring...
    view full answer...
  • How to Install the Universal Wiring Kit # ETBC7 on a 2018 Volkswagen Atlas
    I would be happy tp help you with the installation of the Universal Wiring Kit # ETBC7 on your 2018 Volkswagen Atlas. Start off by connecting the 4-Way/7-Way adapter to the 4-Way, like part # 118754, for the basic trailer lighting functions and installing the adapter on your hitch with the included bracket. A no-drill bracket like part # 18140 can be used to easily mount this to your trailer hitch crosstube. After this is done you will use the self-tapping screw to ground the white wire...
    view full answer...
    Image 1 for Image 2 for
  • Fit of Hopkins Multi-Tow Trailer Connector Adapter HM47570 on 2018 Volkswagen Atlas
    The Hopkins Multi-Tow Trailer Connector Adapter # HM47570 will work in the 7-way trailer socket on virtually any vehicle that has one. This item converts the 7-way connector format to three others that are in common use: 4-pole flat, 5-pole flat and 6-pole round. All of these types of trailer connectors are illustrated and explained in the linked article that covers all types of trailer wiring. Do please note that is not a stand-alone wiring product; it requires that the vehicle already...
    view full answer...
    Image 1 for


< Previous



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




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B
Employee Alexander C
Written by:
Alexander C
Employee Jonathan Y
Video by:
Jonathan Y
Employee Robert C
Test Fit:
Robert C

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.