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  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 # 118587
Retail:$107.24
Our Price: $68.36
You Save: 36%
Custom Fit Vehicle Wiring

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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Custom Fit 118587
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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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118587 or order online at etrailer.com. 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 (25)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118587

  • 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: 2.1 amps per circuit
    • Tail lights: 5.6 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 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 connector will be stowed within 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 three-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.



118587 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118587 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 - 118587

Average Customer Rating:  4.8 out of 5 stars   (25 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:

My family is very happy we discovered this company. We ordered a trailer hitch for our Mazda 6 and all the necessary wiring connectors. It was installed by a trailer company in 25 minutes. We can now pull our POP-UP camping trailer. Service with etrailer was phenomenal,easy to order & fast. We are very happy.




by:

Works well


Comments
great product easy install
kenneth p - 07/05/2022


by:
2015 Mazda 6

Well, my 14 year old son and I got the cable all wired up, picked up the new trailer and 'fingers crossed', the lights worked.

This harness requires you to wire to the battery but would be much better to not have to wire to the battery. Seen other harnesses for other cars that did not need this. Also, I called e-trailer and talked with a very nice person who confirmed I could not avoid the wire to the battery. If we did not do that it was a 15 minute job. However, underneath the car it was a little difficult, manageable but not easy. There is a lot of plastic covers and trying to find a clear path to secure the wire was not obvious and I hope I did it Ok.

In short, the harness was works well and except for the battery run it is all plug and play. Took about 75 minutes. installing the hitch only took us about 25 minutes with my son doing most of the work. All in. Very happy. E-trailer shipped quickly and the videos on the site are very helpful.




by:

The hitch was easy to install. Those bolt leader "fish-wires" are a great invention! etrailer does a nice job with help like videos for us shade-tree mechanics :-)
The wiring harness, while a bit pricey is worth the money. Consider that you need a 3 filament to 2 filament converter if your car has yellow turn signals, the price is not that bad.
The lady (Jean?) that I talked to after hours was very nice and helpful. Shipping was quick. Another etrailer satisfied customer.




by:
2014 Mazda 6

This product fit my 2014 Mazda 6 without any issues. Running the wire up to the battery under the car was a challenge and took longer than other vehicles I've installed these harnesses on due to all of the plastic covers underneath but I got it done.




by:
2015 Mazda 6

The first thing I noticed was the heavy duty construction of the trailer hitch. It looked over built for my application. It was a breeze to install with all the necessary hardware included. The hitch tucks in nicely and does not take away from the appearance of my car. Overall I am very happy with this product.




by:
2014 Mazda 6

The shipping box arrived damaged with the hitch partially sitting outside the side of the box. Thankfully the hitch was not damaged. I have not installed it on the car yet so Iam not able to speak to the fit or ease of installation but I plan to in the next week or 2. The powder coat is chipped in a few spots though. I'll report back again when I have it installed.




by:
2014 Mazda 6

The shipping box arrived damaged with the hitch partially sitting outside the side of the box. Thankfully the hitch was not damaged. I have not installed it on the car yet so Iam not able to speak to the fit or ease of installation but I plan to in the next week or 2. The powder coat is chipped in a few spots though. I'll report back again when I have it installed.




by:
2014 Mazda 6

The wiring harness fit perfectly. The written installation instructions were not very helpful, however.




by:

very easy to install, the cars have a plug in the back that allows the wiring that is already there to connect to the new connector.




by:

I’d say the install was easier that stated. Everything needed is shipped to you and the instructions are clear and easy to understand. The hitch itself is stout and well built.




by:
2014 Mazda 6

Great product.
Plug and play.
Battery
power connection a time consuming adventure.




by:
2016 Mazda 6

great fit. easy to wire no issues!!!


Comments
still works great!
John - 04/26/2018


by:
2014 Mazda 6

It installed pretty painlessly. Hardest part was zip-tieing it in place.




by:

Perfect, no problems whatsoever after a year now......




by:

Plugged right in works just great!!!!!




by:
2014 Mazda 6




by:

Excellent job they did. So easy to install.




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by:
2014 Mazda 6




by:
2014 Mazda 6

Worked great, simple to install




by:
2015 Mazda 6




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

  • Will Tekonsha T-One Wiring Harness # 118587 Fit 2016 Mazda 6 GT with LED Lights
    Yes, the Tekonsha T-One Vehicle Wiring Harness # 118587 that you referenced is confirmed to fit and will work perfectly on your 2016 Mazda 6 GT with the LED tail lights. This custom harness will plug right into existing ports behind the tail light assemblies and receive power by running a hot lead up to the battery. This will provide you with the needed 4-Way connector for powering a trailer's basic signal lights. I have attached the full install manual below that you can also look through.
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  • Choosing Hitch Thats Most Concealed for 2015 Mazda 5
    I've created a photo for you showing all three hitches next to each other. Both hitches share a very similar design, have the same weight capacities and would install in the same manner. The crossbar and receiver opening of all three hitches would be visible below the rear bumper fascia of the 2015 Mazda 6. I'd recommend the Draw-Tite 24908. If you were planning on doing some light duty towing (after checking with your owner's manual or with Mazda to determine if your vehicle is capable...
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  • Trailer Wiring Harness Recommendation for 2016 Mazda 6
    The Tow Ready # 118587 is the Trailer wiring harness I'd recommend for your 2016 Mazda 6. The installation is mainly plug and play, the harness will plug in on the driver's and passenger side, inline between the vehicle's taillight assemblies and the wiring harness that feeds them. A wire will need to be ran under the vehicle up to the engine compartment, where the wire will connect to the positive battery terminal. The Draw-Tite Sportframe # 24908 trailer hitch does not have a ball mount...
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  • Is There A Way Around Splicing Into the Brake Pedal for a Brake Controller on a 2019 Mazda 6
    I have the perfect option for you and it is not the Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 which will require you to splice into the stop light switch circuit behind the brake pedal on your 2019 Mazda 6. Instead, I highly recommend the Curt Echo Mobile Trailer Brake Controller part # C51180 because it is one of the only options that does not require any splicing into the vehicle's stop light switch circuit. The only thing you will need to do for the Curt Echo to work...
    view full answer...
  • Recommended Class III Hitch for a 2017 Mazda 6
    Yes, we do have a class III hitch with a 2" receiver that will fit the wagon model of the 2017 Mazda 6 it is the EcoHitch Hidden Trailer Hitch Receiver item # 306-X7301. This hitch is custom fit and bolts directly to your Mazda 6 with included hardware. If you need a wiring harness to control your trailer or accessories lighting functions I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118587. This custom-fit T-One connector plugs into your...
    view full answer...
  • Hitch and Wiring Harness Recommendation For 2015 Mazda 6
    We do have a light-duty Class I hitch for your 2015 Mazda 6 Sedan. I recommend Curt hitch # C11356 because it is the lowest-cost option and requires no drilling for installation. It bolts on using included hardware as shown in the linked video. The ball mount you can use is part # C45016 and for a hitch ball use either 2-inch ball # A-82 or 1-7/8-inch ball # A-80. For wiring I recommend Tow Ready kit # 118587 which will give you a 4-pole flat trailer connector. The linked article will...
    view full answer...
  • Available Trailer Hitches and Rated Capacities for 2015 Mazda 6
    We do offer two 1-1/4-inch Class I trailer hitches for the 2015 and 2016 model years of the Mazda 6 sedan. Both model years are part of the car's third generation and so they share hitch fits. The available hitches are shown on the linked page. All share the same weight capacities: 200-lbs of tongue weight (TW) which is downward force on the hitch and 2000-lbs gross trailer weight (GTW). Please note that you will want to check your Mazda owner's manual to confirm if the car is rated...
    view full answer...
  • Class I Trailer Hitch for 2017 Mazda 6
    We do offer two choices of light-duty Class I hitch for your 2017 Mazda 6, the USA-made Curt # C11356 and the Draw-Tite # 24908. Both share the same no-drill installation with included hardware and you can see the whole installation in the video I linked for you. For a 4-pole wiring harness you can use # 118587, for a ball mount # C45016 and for a hitch ball part # A-82 for a 2-inch ball or # A-80 for a 1-7/8-inch. Be sure to check your Mazda owner's manual before towing.
    view full answer...
  • Recommended Trailer Hitch Receiver For Carrying a Bike Rack With 2" Receiver Behind a 2016 Mazda 6
    If you are wanting to use your 2" bike rack you will want to install the EcoHitch Hidden Trailer Hitch Receiver # 306-X7301 on your 2016 Mazda 6. Both the Trailer Hitch Receiver Adapter # e43YR which will fit the Curt Trailer Hitch Receiver # C11356 and Hitch Adapter # HTAD reduce the capacity of the receiver by 50%. This will reduce the tongue weight from 200lbs to 100lbs by using the adapter and will likely push your bike rack with any bikes over the 100lb limit. By using the EcoHitch...
    view full answer...
  • What is Included with Trailer Hitch # C11356 for a 2016 Mazda 6
    The recommended ball mount for Curt trailer hitch receiver, part # C11356, is 9-3/8 inches long with 2-5/8 inches of rise or 3-1/4 inches of drop. It's part # C45016. If you prefer a draw bar with 5 inches of rise use part # C45014. The hitch ball is not included so you can use part # A-82 for a 2 inch ball or part # A-80 for a 1-7/8 inch. They'll fit both the included and the other draw bar I mentioned and # F-4 is the pin and clip that fits. You also need a wiring harness to power...
    view full answer...

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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
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