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  1. Custom Fit Vehicle Wiring
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  5. Trailer Hitch Wiring
  6. Powered Converter
T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module - 4-Way Flat
Tekonsha

T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module - 4-Way Flat

Part Number: 118781
In Stock
$47.81
Retail:$68.39
You Save: 30%
Custom Fit Vehicle Wiring

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118781 - 4 Flat Tekonsha Trailer Hitch Wiring
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118781 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 Upgraded Circuit Protected ModuLite HD Module - 4-Way Flat. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (221)
  • Q & A (0)
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Tekonsha Custom Fit Vehicle Wiring - 118781

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

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. 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
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
  • 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 an interior trim panel in your rear cargo area, on the passenger's side. Once you've plugged in the connector, you will have to route the harness through the jack storage compartment to the center of your vehicle. Before plugging the included 7-way socket into the tow harness, locate the fuse box under your hood and insert the provided fuses.


Once installation is complete, the 4-way 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 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.




118781 Tekonsha T-1 T-Connector - 4-Flat - Modu-Lite

Installation Details 118781 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module - 4-Way Flat - 118781

Average Customer Rating:  4.8 out of 5 stars   (221 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.

by:

I had a difficult time installing. I could not identify the extra tail light wire in the panel and had to fish a wire from the tailgate to the harness.

Larry profile picture

Larry

4/26/2024

Great. No issues.



by:
2019 Honda Odyssey

Great all around experience. Customer service was nice to work with in addressing a shopping issue. Installation videos were great and exact match to my vehicle. Installation was nice and easy.

Andrew profile picture

Andrew

5/22/2024

Had the product for a year, still works great.



by:

The hitch was easy to install and looks great. There was only one problem. I received the hitch with the wrong hardware kit. Customer support was great and shipped me the correct hardware at no cost

The wiring harness was very easy to install and came with excellent, clear instructions.



by:

Couldn’t believe how easy it was to install. Great fit guide and instructional video on the item page.



by:

Wiring harness was easy to install and all lights worked!

Nathan profile picture

Nathan

4/18/2024

Everything still working as expected. no issues!



by:

Light cable is a little too long, but that's be my only complaint.

We've pulled our camper up to North Carolina and all around Florida without any problems related to the hitch.



by:
Honda Odyssey

I installed this on my 2023 Odyssey van twelve months ago. Installation was easy. I’m very pleased with the product.



by:
Honda Odyssey

I installed this harness in a 2023 Honda Odyssey, and it works great, and was easy to install. The videos online walked me right through the process.
Easy install, functional, and priced right!



by:
2023 Honda Odyssey

etrailer sent me quality parts with outstanding follow-on instructions. I was provided excellent customer support. Thank you! Superior quality company.



by:

Installed on 2020 Honda Odyssey. Fast shipping even a few days before Christmas! Super easy to install. I read the instructions and watched a few different YouTube videos as a cheat. The uHaul video shows how to route the harness wires through a small existing vent on the driver's side which I did. I also routed the wires above (inside) the bumper and easily pulled just enough of the harness out to cable tie to the hitch right at the receiver. Great purchase and easy installation.



by:

Easy to install, but I took it a step further. Instructions say to run the wire out the door, and close the door on the wire. I removed the brake/directional light and ran the wire out an unused panel plug, then down under the bumper. This will take an extra 30 minutes but all the wires will be hidden.



by:

Easy installation great, instructional video



by:
2019 Honda Odyssey

Very good product. Instructions were more than adequate. I was able to route it under the trim panels and down to the hitch with only minimal trimming.



by:

Easy install for the ‘19 Honda Odyssey. Everything you need for a factory fit. Visit YouTube U-Haul video for technique to easily pass harness through to outside and zip-tie cable to your hitch. Extra length, too.



by:

Easy to follow instructions, good quality, no issues. Tucks away nicely when not in use.



by:

Easy to install, used the provided instructions as well as YouTube videos. Very pleased!



by:
2020 Pontiac Trans Sport Van

As always the wiring harness is very easy to install as it's plug and play. Good price and fast shipping made it just in time for me to hook up and transport my car!



by:

Best price... Fast shipping... Easy Install... Great Instructional Videos... Awesome experience over all. Highly recommend working with etrailer.



by:

The hitch and wiring harness are good quality and easy to install. We’ll worth the price



by:
2019 Honda Odyssey

Install wasn't too bad. There is a good video on YouTube on how to route the wiring through the vent.



by:

Works as expected with good instruction s.



by:

Pretty easy to install. I watched an etrailer video can that made everything so much easier.



by:
2023 Honda Odyssey

Wiring harness and hitch fit perfectly in 2023 Odessey.



by:

I can only rate this as a first impression, as I have not installed it yet. This harness looks good, and after watching the videos, I have no doubt install would be straightforward, and it would work exactly as intended. Shipping was quick, no problems whatsoever.



by:
2022 Honda Odyssey

Excellent video on installation.


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
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Jameson C
Employee Lindsey S
Edited by:
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Employee Joshua S
Video Edited:
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Employee Jacob T
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Employee Dustin K
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Employee Cole B
Installed by:
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Employee Ronnie R
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Shane H
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