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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. 4 Flat
  5. Trailer Hitch Wiring
  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 # 118786
Retail:$146.65
Our Price: $82.12
You Save: 44%
Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Vehicle Wiring - 118786
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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 118786 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 (269)
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Tekonsha Custom Fit Vehicle Wiring - 118786

  • Custom Fit
  • 4 Flat
  • Trailer Hitch Wiring
  • 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 behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite power module that 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 behind the driver's-side and passenger's-side tail lights. You will have to remove the access cover and the tail light assemblies to access this harness.


T-One Connection Location Points Behind Tail Lights

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 beneath your vehicle. A mounting bracket (sold separately) is recommended to keep the connector secure.


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.



118786 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Replaces Tekonsha 118782

Installation Details 118786 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 - 118786

Average Customer Rating:  4.9 out of 5 stars   (269 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:

Easy to install, hot wire attached to lug on side of fuse block w/fuse.
Use 4' flex rod for electrical to fish wire to fuse block under vehicle

Mike

3/26/2024

Working great



by:

Another successful order and install from etrailer.com! Always fast shipping and excellent installation guide videos! Installed on 2021 JL Wrangler EcoDiesel.



by:
Roadmaster

On Sat 3/9/24 I called etrailer and attempted to order Roadmaster Direct-Connect Base plate.., phone lines down so you couldnt place my order. The price then was 397.71. You called me back following Sunday and was able to place my order. The price on same item one day after my first attempt was now $[XX] which I paid not reallizing the price had increased by $[XX] dollars . I checked your site and the price had indeed increased to $[XX]. I checked the site again on Tuesday 3/12/24 and the price had decreased again to $[XX]. I called you to have my account credited the $[XX] as I had not even received the item yet. You told me that couldnt be done. You would however re order and I could return the one that hadnt even arrived yet,, but that I would have to pay shipping of $[XX]. How ridiculous does this sound? You told me that if I paid for a gallon of gas one day and the price dropped the next day i couldnt expect the gas station to take it back so etrailer wouldnt credit me the $[XX] either. I can’t believe this happened even as I write this review it sounds so stupid. I feel I was over charged $[XX] and think I’m still due a credit. I have been a customer for years but no more.



by:

I looked at a lot of auto stores . No one could come up with what I needed.
Contacted etrailer. Problem solved.
Thank you, etrailer!



by:

Jeeps are notorious for electrical problems. This product isolates the automotive system from a trailers systems. Very good idea and I love it. My background is in aircraft electrical systems. I have worked in this field since 1977. This is a great product. I'll buy another if needed and I'll recommend it to others.



by:
2021 Jeep Wrangler Unlimited

I am not one to work on my vehicles, mostly because I find it to be of very little interest.” Unfortunately,” with the economy heading south and prices soaring “ AGAIN “, I found myself in a sqeeze.
I put on my big boys work wear nand attacked the installation of the wiring harness kit for My 2021 Wrangler 80th anniversary Jeep.
The directions were very easy to follow and before I knew it, I was wrapping it up. Start to finish in one hour and forty five minutes. Thank you etrailer



by:

Perfect package - comes with everything you need and good instructions. I found a video on the etrailers site was more helpful than the printed ones.



by:

Kit is well organized and seems to have been well thought out. It is a pain in the rear to run the power line all the way to the battery but has to be done. I keep asking myself why I can't just splice the yellow, green and brown wires into the taillight wires and call it good. I supposed that the little gremlin in Jeep's computer would be upset and keep sending messages that there is a problem with the lights.



by:
2018 Jeep JL Wrangler Unlimited

I prefer to use this Tekonsha module for the vehicle that don`t have the factory tow harness. The module was tucked away in the body cavity behind the drivers side tail lamp assy. All wiring was covered in HD split loom. All wiring was concealed as much as possible by running them through the cross rail and frame rail up to the battery positive terminal. I did lengthen the green wire on the passenger side to accomplish this. All connections were done with heat shrink connectors. Installation did take longer than usual based on the wire routing I chose. Overall I am totally satisfied with this product.



by:

Wiring working excellent on my 23 Jeep Gladiator. Great company to deal with, you can't go wrong



by:
2018 Jeep Wrangler

I've purchased a handful of trailer hitches/wiring harnesses over the past 10 years and they have always been awesome!! Quality products and fast shipping every time!! Just recieved a new class 111 hitch & wiring harness for my 2018 Wrangler JL and installed the hitch in less then 10 minutes and the wiring was approximately an hour after watching the video provided on their website. Never been disappointed!!



by:

Great kit and easy to install.



by:

Was easy to install, compatible with the factory plugs on my Jeep Wrangler. Aftre 1 year of use it’s woking god.



by:

very easy install thanks to the outstanding video. Adding this and an $80 -2 inch receiver was way cheaper than buying from the dealer. Since I had the taillights off, i threw in a fuel filler door at the same time.



by:
2019 Jeep Wrangler

The harness came with great and simple instructions. I was easily to install it and it works great! Thanks for a great product and I highly recommend it for anyone looking to put a trailer harness on their vehicle.



by:

Product works well with my 2022 Jeep Wrangler 4xe. etrailer was great in helping to ensure that this product would actually work with my Jeep. Thank you!



by:

Very fast and the items are excellent, Thanks



by:
2021 Jeep Wrangler Unlimited

Great service quick delivery



by:

Exactly what we wanted, hitch was very easy to put on. Very quick arrival. We ordered a wrong harness snd customer service was very quick and courteous to help us get a return label.
Would highly recommend this company.



by:

Great company to deal with.



by:

Fairly easy to install as long as the vehicle is up on ramps or even better would be a lift. I used ramps and crawled the length of my jeep to run the wires to the front and secured them to the frame away from heat or pinch points.



by:

All good worked perfectly without a glitch. Towed the Jeep Wangler 4xe over 10,000 miles in 2023.



by:

Great harness that installed easily following video instructions.



by:
2022 Jeep Wrangler Unlimited

Easy to install, works perfect!



by:

The wiring harness was made of high quality parts and very easy to install. It had all the hardware need to wire it in correctly.


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Info for this part was:

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