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

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

Item # 118781
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Custom Fit Vehicle Wiring

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Tekonsha Custom Fit Custom Fit Vehicle Wiring - 118781
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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. Guaranteed Lowest Price 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 (109)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118781

  • 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 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 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   (109 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:
2019 Honda Odyssey

The harness fit perfectly on our 2019 Honda Odyssey, and installation was very easy. Everything worked exactly as it should. At first, I planned run the wires to the outside of the car, but finally decided to just leave them coiled up inside the cargo area and then run them out through the tailgate when we needed to use them. This works very well, and it should save us wear and tear on the wiring by being constantly exposed to the weather outside of the car. Plus, it makes the installation much simpler. This is an excellent wiring harness, and I highly recommend it.


Comments
Perfectly! It’s been flawless, and we just love it! Great wiring harness, we highly recommend it!
Wes - 05/28/2022

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:

From the order I placed (with the help of Gwendolyn Y) to the knock on my door
from the UPS driver delivering the hitch, there was nothing but good things that happened. Gwen's customer service skills and overall knowledge of the parts was totally unbelievable. It was almost like I knew what I was doing! I
Her patience during my stupid questions was commendable. She is a credit to the e-trailer company and deserves a raise!!!!This was my second purchase and probably not my last. Thank you and Gwen as well.



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:

Super easy to install. There is a screw that holds the fuse panel in. I used that screw for the ground so there was no drilling required at all.



by:

Easy install and nice directions. Especially when using the online instructions.



by:
2022 Honda Odyssey

It doesn't get much easier!! Shipping was super fast and etrailer provides great installation videos.



by:
Honda Odyssey

Exactly what we needed for our Honda Odyssey. Watched video for install and went easily.



by:
Honda Odyssey

The wiring harness fit perfectly on my 2021 Honda Odyssey.



by:

One year later and everything functioning as designed. As a side note, about 2 weeks AFTER I purchased my equipment I noticed there was about a $xx drop in price. I called etrailer and they refunded that amount. That was nice!



by:

Adam E was outstanding to work with. I highly recommend etrailer Low price guarantee Excellent installation instruction.



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:

I watched the instructional video and this product installed quite easily in about 20 minutes. I did two things differently than what the video showed. First, I attached the black box with the double-sided tape above (rather than to the right of) the opening to the fuse panel. Second, I left the wiring coiled up inside the fuse panel so that it is completely hidden when not in use. When in use, you can open the fuse panel and route the wire out through the bottom of the cover (leaving the cover in place).


Comments
I’ve towed a small trailer a couple times and everything has been perfect. I like that the wiring ticks away invisibly inside the van, where it is protected from the elements.
Franco - 06/14/2021

by:

No disappointments, hitch is still solid 1 year later. Online instructions were spot on



by:
2019 Honda Odyssey

Hitch arrived quickly. The installation videos showed exactly how to do it. It installed relatively easy. Admittedly, when they have a lift, all the proper tools, and experience doing it many time it makes it a whole lot easier. But even for me doing it for my first time I was able to take care of it without any major problems.


Comments
Still working great. I have used it many times over the past year. Havent had any problems. No rust either. Still in great condition.
Aaron L - 05/18/2021

by:
2018 Honda Odyssey

Fit well with no problems, arrived quickly and in great shape.



by:
2018 Honda Odyssey

Seriously easy to install.



by:

I ordered my products on line and was able to find everything I need to install my trailer hitch. It arrived well packaged and will all the right parts.

I have not installed the unit yet, so cannot comment on how it fit.


Comments
Perfectly. I have pulled many different trailers and have had no issues.
Glen - 06/22/2020

by:

Accurate sales advice, fast shipping, competitive pricing. Prefect combination.

This is the 5th or 6th wiring harness I have installed for friends and family.

Great time saver and easy to install



by:
2018 Honda Odyssey

This wiring harness was an exact fit for our 2018 Honda Odyssey.



by:

Received my Curt Class II trailer hitch very quickly which was appreciated. Fit as advertised and easy to follow instructions that were a little different from what was presented on YouTube. The enclosed instructions were actually easier. By following the enclosed instructions I was able to mount the hitch by myself with little difficulty. I had ordered a Curt hitch from ETrailer nine years ago and was satisfied with the product then as I am now. One item that I believe helpful is to note that there are two bolt fish wires included in the parts package so there is no need to buy others. The fact that they were included was not mentioned in any of the product write ups which resulted in my purchasing something I did not need. The hitch although visible on the vehicle does not destroy the look of my Odyssey. Happy!!



by:
2022 Honda Odyssey

Installation was easy following the instructions and system is working as it should



by:

Great site, product arrived perfect



by:

Product wiring was screwed up, wiring going into the converter box did not match wiring coming out. etrailer quickly sent a new one and it was fine. Two stars for wasting a lot of my time wondering why the lights were not functioning properly and having to prove they were wrong and request a new one. The company's service is 5 stars so no problem there.



by:
2020 Honda Odyssey

Love the looks of this hitch on my Odyssey. Easy to install. Took only an hour and one half, including wiring. Took a few extra minutes to find the fuse locations since the instructions didn't mention it, but the picture on line showed it. All in all, a heavy made hitch that looks great, more than pleased. The shipping was very quick and a smooth transaction. Thank you


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring



  • Will Installing Trailer Wiring in 2019 Honda Odyssey Void Warranty
    There is a law called the Magnussen-Moss warranty act that states, in part, that if you install an aftermarket part on your car then it will not void the warranty unless that part caused the problem. So installing the trailer wiring harness, # 118781, will not void the warranty. I have included a link to the installation details and a link to a video showing a typical installation.
    view full answer...
  • Best Trailer Wiring Harness Option for 2022 Honda Odyssey
    For your 2022 Honda Odyssey the Tekonsha # 118781 harnesses has shown to be the better option, their converter boxes in particular. This is from customer feedback and information from our installers. This custom-fit T-One connector simply plugs into your vehicle's wiring harness and then you route the harness through the jack storage compartment to the center of your vehicle. Plug in the included 7-way socket to the harness, then locate the fuse box under your hood and insert the provided...
    view full answer...
  • Does Tekonsha Trailer Wiring Harness # 118781 Fit 2022 Honda Odyssey
    Yes the trailer wiring kit part # 118781 that you referenced does fit a 2022 Honda Odyssey. I attached an install video for this kit on a 2022 Odyssey for you to check out as well.
    view full answer...
  • Trailer Wiring Recommendation for 2022 Honday Odyssey
    For your 2022 Honda Odyssey the best trailer wiring option is the Tekonsha kit part # 118781 which installs very easily and also has the most reliable converter box of the kits we offer. I attached an install video for this for you to check out as well.
    view full answer...
  • Easiest Trailer Wiring To Install For A 2022 Honda Odyssey
    For your 2022 Honda Odyssey, I recommend the T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module # 118781. This kit is about as easy as it come, and will simply connect quickly and easily by plugging into your vehicle's factory wiring.
    view full answer...
  • Correct Trailer Wiring Harness for a 2018 Honda Odyssey EX
    The T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module part # 118781 is correct for a 2018 Honda Odyssey EX. It will plug into the connector I pointed to in your photo.
    view full answer...
    Image 1 for
  • Recommended Trailer Wiring Harness for 2020 Honda Odyssey
    For Honda Odyssey models with the pins missing from the 10,11 and 12 fuse locations, you'll need to use the Tekonsha # 118753, as the fuse box won't supply the power needed to run the trailer lights if the # 118781 is used. Honestly, running the wire to the battery isn't too terribly difficult. You'll simply follow the brake lines up to the front as shown in the linked video.
    view full answer...
  • 2020 Honda Odyssey Difference Between Tekonsha 118781 and 118753 Wiring Harnesses
    Both the # 118781 and the # 118753 are indeed confirmed to fit the 2018-2020 Honda Odyssey, both use T-connectors to plug into your tail light connectors, and both are rated at 5 amps for the stop/turn circuit and 7.5 amps for the tail light circuit. The main difference is that the # 118753 includes extra wire to run a power wire to the battery, whereas # 118781 comes with extra fuses which activate the "tow package" and power the harness through it. So, which one do you need? Well, you'll...
    view full answer...
    Image 1 for Image 2 for
  • Most Hidden Trailer Hitch for 2020 Honda Odyssey
    The most hidden trailer hitch we have for your 2020 Honda Odyssey is the Draw Tite part # 76170. Only the hitch opening hangs below the rear bumper so you only see the hitch opening. This also helps with ground clearance. I attached a picture that shows what the hitch looks like when installed as well as an install video. For trailer wiring the Tekonsha kit part # 118781 is what I recommend as well. It is very easy to install since it plugs into a factory port at the rear of the vehicle...
    view full answer...
    Image 1 for
  • Difference Between Tekonsha Trailer Wiring Harnesses that Fit 2019 Honda Odyssey
    The big difference between the two Tekonsha trailer wiring harnesses that fit your 2019 Honda Odyssey is how they draw power to activate the trailer lights. The # 118753 has a wire that runs up to the vehicle battery which is used to power all of the trailer lights directly from the battery. This is a much safer setup but the install in more involved and it costs more. The part # 118781 installs much easier but it draws power for the trailer taillights through the wiring panel of the Odyssey....
    view full answer...
  • Does Draw-Tite Trailer Hitch Receiver 24925 Require Impact Bar Removal On 2021 Volkswagen Golf TSI?
    The Draw-Tite Sportframe Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # 24925 you were looking at for your 2021 Volkswagen Golf TSI will not require you to remove the factory impact bar on the rear bumper, and since the data modem you mentioned is on top of the impact bar you will have no issues as the # 24925 sits underneath the impact bar. I included a link to the written instructions of the # 24925 for you to take a look at.
    view full answer...
  • What Is The Best Vehicle Wiring Harness For A 2022 Honda Odyssey?
    For your 2022 Honda Odyssey the best vehicle wiring harness is the Tekonsha T-One Vehicle Wiring Harness # 118781. Upon installing and testing various brands of harnesses we have found the Tekonsha branded ones to hold up the best over time and be the most reliable which is why they have become a favorite of our installers. Now before ordering the harness I recommend double checking that in fuse locations 10, 11, and 12 in the fuse box of behind the driver side rear access panel has pins...
    view full answer...
  • Recommended Trailer Hitch and Wiring Harness For 2022 Honda Odyssey w/ Hands Free Lift Gate Sensor
    For your 2022 Honda Odyssey I recommend the Draw-Tite Trailer Hitch Receiver # 76170 due to its hidden crosstube design meaning once installed the only visible part of the hitch will be the receiver itself as shown in the included picture, but also due to its 525lb tongue weight and 3,500lb trailer weight rating that aligns perfectly with the max towing capacity of your vehicle. This hitch will work perfectly with your hands free lift gate sensor, you will just need to place your foot...
    view full answer...
    Image 1 for
  • Will The Hands Free Liftgate Still Work On A 2022 Odyssey After Installing The Draw Tite 76170 Hitch
    Though I am unaware of an adapter for the hand-free liftgate on your 2022 Honda Odyssey, I can absolutely say that you will not lose this feature after installing a hitch, like the Draw-Tite # 76170. With that being said, directly in the center of the bumper will no longer work to open it as this is where the receiver opening will be, but you will just need to find the sweet spot on either side that trips the sensor and actuates the liftgate. It will take a couple times to get used to,...
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2019 Honda Odyssey
    For your 2019 Honda Odyssey the trailer hitch I recommend is the Draw Tite hitch part # 76170 which is a confirmed fit. It has a 2 inch opening which means most hitch accessories are made to fit it and it has the best towing capacities. It also has a concealed crosstube which means it won't be quite as visible as other hitches. For trailer wiring the best option is the T-One kit part # 118781 which has the most reliable converter box of all of the harnesses we carry. If you wanted to...
    view full answer...
    Image 1 for
  • Trailer Hitch and Wiring Recommendation for 2019 Honda Odyssey
    We have everything you'll need to tow a small trailer with your 2019 Honda Odyssey. Let's start with a hitch like you mentioned. For that I recommend the Draw Tite hitch part # 76170 because it has a 2 inch opening which means it will have great towing capacities and because it has a concealed crosstube which makes it far less visible and also helps reduce ground clearance issues on vehicles that sit as low as yours. I attached a picture and an install video for this hitch for you to check...
    view full answer...
    Image 1 for
  • Difference Between Tekonsha 118781 and Curt C56382 Trailer Wiring Harness for 2019 Honda Odyssey
    Both the Tekonsha T-One # 118781 and Curt T-Connector # C56382 are custom trailer wiring harnesses confirmed to fit your 2019 Honda Odyssey, but I do recommend the Tekonsha # 118781 for a couple reasons. First, the Tekonsha harness does feature a higher amp rating (max 5 amps for stop/turn circuits and 7.5 amps for tail lights compared to 3 amps and 6 amps respectively on the Curt), which just offers a stronger system that's able to take a bit more power. In addition to the higher amp...
    view full answer...
  • Difference Between Tekonsha and Curt Trailer Wiring Harness for 2020 Honda Odyssey
    Both the Tekonsha T-One Vehicle Wiring Harness # 118781 and the Curt # C56382 T-Connector are custom harnesses designed specifically for your 2020 Odyssey, and will plug into the same factory port behind the driver side trim panel. In terms of function and install these are identical, however I do recommend the Tekonsha # 118781 because it features a higher amp capacity and a superior converter box, which has proven to have a longer lifespan than those from other manufacturers. I have...
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2020 Honda Odyssey
    The best hitch option we have for your 2020 Honda Odyssey is the Draw Tite hitch part # 76170 as it has the best towing capacities, is a 2 inch hitch which means accessories and ball mounts are easier to come by since this is the most popular size, and because only the hitch opening hangs below the rear bumper of the vehicle which gives it a more concealed look! See attached picture and review video as well. For trailer wiring then you'd want the Tekonsha kit part # 118781 which is very...
    view full answer...
    Image 1 for
  • Choosing Between Tekonsha or Curt Powered Taillight Converter/Wiring Harness for 2020 Honda Odyssey
    Functionally speaking, there isn't a huge difference. The Curt # C56382 has a slightly lower capacity at 3 amps for circuit for stop/turn signals and 6 amps for taillights. The Tekonsha # 118781 has a capacity of 5 amps per stop/turn circuit and 7.5 amps for circuit for taillights. Honestly, you'll probably never need the added capacity unless you're towing something that's lit up like a Christmas tree but having a little unneeded wiggle room as far as capacity goes never hurts. From what...
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2020 Honda Odyssey
    The hitch I recommend for your 2020 Honda Odyssey is the Draw Tite part # 76170 as it has plenty of towing capacity and has a concealed cross tube which gives it the most hidden look. This also helps with ground clearance as well. Check out the install video and picture I attached for more info as well. Then for trailer wiring the Tekonsha kit part # 118781 installs very easily and also comes with a very reliable converter box as well. I attached an install video for this for you to check...
    view full answer...
    Image 1 for
  • Best Trailer Hitch and Wiring Recommendation for 2020 Honda Odyssey
    The best trailer hitch option we have for your 2020 Honda Odyssey is the Draw Tite part # 76170 as it has great towing capacities, a mostly hidden appearance, and the best ground clearance. Check out the picture I attached of the hitch installed as well as the install video link on this page as well. The best trailer wiring option we have is then the Tekonsha kit part # 118781 as it installs the easiest and has the best converter box. I attached an install video for this for you to check...
    view full answer...
    Image 1 for
  • Does Draw-Tite Trailer Hitch # 76170 Fit 2019 Honda Odyssey
    Yes, Draw Tite and us have confirmed that the hitch part # 76170 fits your 2019 Honday Odyssey. I attached an install video link for this hitch on a 2019 Odyssey just like yours. If you wanted to do some towing the trailer wiring harness part # 118781 is the kit I recommend. It installs easily as it's a plug and play option and the converter box is very reliable. I attached an install video for this kit for you to check out as well. Also you might be interested in etrailer ball mount...
    view full answer...
  • 2018 Honda Odyssey Trailer Wiring Recommendation
    The trailer wiring harness you would need based on what you were able to find is the Tekonsha kit part # 118781 which I attached an install video for on a 2018 Honda Odyssey just like yours.
    view full answer...


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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
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Employee Lindsey S
Edited by:
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Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
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Employee Cole B
Installed by:
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Employee Wilson B
Updated by:
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Employee Isabelle B
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