1. Custom Fit Vehicle Wiring
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  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

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Our Price: $80.08
Custom Fit Vehicle Wiring

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118781 - 4 Flat Tekonsha Trailer Hitch Wiring
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In Use/Installed

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. Call 800-298-8924 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.
  • All Info
  • Reviews (39)
  • Q & A (53)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring

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

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

Item # 118781

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   (38 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.

- 118781
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. 661316


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

81673

- 118781
by:

Extremely easy to install. Literally plug inn and it's ready to go. Thanks you! 679533



- 118781
by:
2018 Honda Odyssey

My husband and his dad watched the included youtube video and installed the hitch in a very reasonable time, without any issues. The installed hitch looks great on my Odyssey! 694171



- 118781
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 733953



- 118781
by:

Happy with the product, and happy with the fast delivery. 665805



- 118781
by:

Really like the OEM like look of the trailer. Install was super easy and the videos were great guides. Highly recommend. 677453



- 118781
by:
2019 Honda Odyssey

So far, so good! The online instructions are slightly easier to understand than the ones printed with the order. But, the end-all be-all is the video. Watched it three times, and installation was a breeze. This also applies to the trailer hitch, which I bought in the same order. 670734



- 118781
by:

Perfect fit, I have nothing negative to say. 854041



- 118781
by:

Super easy, worth the price. 853751



- 118781
by:

Very easily install. I wish there was a better option to have the wire route out of the van but that’s a vehicle design not a complaint with this. 851026



- 118781
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). 814749



- 118781
by:

Easy to install with etrailer’s install video. Took me about 15-20 minutes without rushing. 809344



- 118781
by:
2018 Honda Odyssey

I ordered my hitch and wiring on a Wednesday evening and they arrived in less than two days on Friday morning. With the detailed videos, installation was easy. I was quoted $375 locally for installing the hitch and wiring but in purchasing from etrailer.com, I did it myself in under two [hours]. Great experience! 803650



- 118781
by:
2018 Honda Odyssey

Very easy install with everything "plug and play". The install video was very helpful. 799897



- 118781
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. 798985



- 118781
by:

Great product. Installation was easy after watching the video. Looks good on the Odyssey. Also happy with the trailer light kit. Good experience overall. 798101



- 118781
by:
2019 Honda Odyssey

Great product everything fit perfectly as they said we definitely purchase again from this company 798010



- 118781
by:
2019 Honda Odyssey

Online tools to identify the correct hitch for my vehicle were easy and seamless. The specifications and tutorial videos really helped me decide which hitch and harness would be best for my circumstances. Installation was easy. Three pictures show my finished project. I am glad I went with the “below bumper“ installation rather than through the bumper facia. I installed a class III receiver onto my black 2019 Odyssey EXL. The hitch fits close to the bottom of the bumper and is nearly Invisible. I am pulling a 6 x 12 PJ utility trailer. The vehicle and hitch perform marvelously. As well, the light harness installed easily and quickly, and cannot be distinguished from original equipment. This is my second receiver hitch from etrailer and I could not be any more pleased with the service and product. Great job guys! 797877



- 118781
by:

Extremely easy install with and easy to follow video. 790126



- 118781
by:

Good product. Easy to install. 789868



- 118781
by:

Really nice product. I didn't end up sliding the wire under the panel like the video. I actually tucked all the extra wire and tucked in in the fuse box area, on the left there is a lot of open space. So this way the wire is completely out of sight. and you can pull it out when needed. **2018+** owners should know that the notch that lets you open the fuse box will let you pass wires through. so no need to pull on panel or take it off. This way everything is neat and clean. 775782



- 118781
by:

Toughest part of the install was getting the ground screw started without dropping it. Finally used a drill bit to make a small starter hole and then popped it right in. The rest was really a “snap”. 762629



- 118781
by:

Installation took all of 10 minutes thanks to the installation video. Really "plug and play"! Paired with hitch #76170 which was also very easy to install due to the video (did it solo in under two hours) for a near invisible package. Thanks etrailer.com. This is my fourth trailer hitch from etrailer.com and I will keep coming back as long as I keep buying new cars! 754808



- 118781
by:

Thank you for install video..unit works great. 747051



- 118781
by:
Honda Odyssey

I put this in my 2020 Honda Odyssey. Very simple installation. Quality product. The picture quality in the directions could better. 744826


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Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • Comparing Wiring Harnesses Available for the 2020 Honda Odyssey
    I can see why this might be confusing and there are some differences between all 3 of these wiring harnesses. I'll start off by explaining the differences between the Tekonsha # 118781 and # 118753 wiring harnesses. The main difference is that the # 118753 is designed for vehicles that do not have the towing fuses already in place. In order to determine which one you can use on your 2020 Honda Odyssey you'll need to check the rear interior fuse box, which is located on the left side...
    view full answer...
  • Comparing the Trailer Wiring Harnesses for a 2020 Honda Odyssey
    There are three trailer wiring harness options for a 2020 Honda Odyssey, the T-One Vehicle Wiring Harness part # 118781, the T-One Vehicle Wiring Harness part # 118753, and the Curt T-Connector Vehicle Wiring Harness part # C56382. The T-One Vehicle Wiring Harness part # 118781 is what I recommend because when compared to the T-One Vehicle Wiring Harness part # 118753 comes with additional fuses that may or may not be needed to activate the tow package. If you want to check the fuse box;...
    view full answer...
  • Recommended 7-Way Trailer Connector and Brake Controller for 2019 Honda Odyssey
    To set your 2019 Honda Odyssey up to pull your trailer that is equipped with electric brakes you will need to start with a 4-Way trailer harness. For this the Tekonsha T-One # 118781 will work perfectly. This custom harness will install by plugging right into the factory port behind the interior trim panel in the rear cargo area (see attached image). This particular harness features a higher amp rating than the Curt alternative that is also available for your Odyssey and also allows...
    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,...
    view full answer...
  • What Is the Best Trailer Wiring Harness Option for 2020 Honda Odyssey
    As long as your 2020 Honda Odyssey doesn't fall into the extremely rare category of Odysseys that are missing terminals on fuse locations #10, #11 and #12 inside the fuse box, your best option is to go with the Tekonsha # 118781. Curt offers a similar option with the # C56382, but in our experience, the Tekonsha harnesses, and their converter boxes in particular, seem to do a better job and have proven to outlast the competition. If you want to be extra sure, you can look behind the...
    view full answer...
  • 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...
    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...
  • 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...
  • Recommended Trailer Wiring and Brake Controller for 2019 Honda Odyssey Elite
    For your 2019 Honday Odyssey you can get the factory wiring harness for the 4-way or you can use the T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module - 4-Way Flat # 118781 which installs behind the driver's side trim panel in the cargo area. Then to upgrade to the 7-way you will use either the # ETBC7 for most brake controller applications or use the # ETBC7L for the Curt Echo brake controller # C51180. This controller doesn't require any wiring into...
    view full answer...
  • Parts Needed to Install Brake Controller on 2020 Honda Odyssey
    To install a brake controller, like the Curt Echo # C51180 on your 2020 Honda Odyssey, first, you need to install a 4-pole flat with a powered converter module to provide enough to power and to properly activate your trailer lights. I recommend the Tekonsha # 118781 because it includes the fuses needed to complete the install and it's also the most reliable. Next, you can use our 7-Way RV Upgrade Kit for Trailer Brake Controller Installation # ETBC7L to adapt the 4 pole harness previously...
    view full answer...
  • 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...
  • Parts Needed to Add 5 Way Connector to Tekonsha 118781 on 2018 Honda Odyssey
    Yes. This is possible. You can't add a reverse light circuit wiring directly to the Tekonsha # 118781 wiring itself, but you can use the Hopkins Adapter 4-Pole to 5-Pole Trailer Wiring Adapter - Shorter # 47515 to install one on your 2018 Honda Odyssey. You will need to use a circuit tester like the # PTW2993 to find the reverse light circuit on your vehicle and then splice in this harness to allow you to connect to the 5 way connector on your trailer.
    view full answer...
  • 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...
  • Recommended 7-Way Trailer Connector and Brake Controller for 2020 Honda Odyssey
    We have exactly what you need to set your 2020 Honda Odyssey up for towing a trailer equipped with electric brakes. The first thing you will need to do is add a 4-Way trailer wiring harness. For this I highly recommend the Tekonsha T-One # 118781 that will plug right into a factory port behind the driver's side trim panel on your Odyssey. This will give you a 4-Way connector that can power a trailer's basic signal lights. I have attached an install video that you can follow along...
    view full answer...
  • Comparing EcoHitch and Draw-Tite Trailer Hitches for 2020 Honda Odyssey
    Both the EcoHitch # 306-X7372 and Draw-Tite # 76170 trailer hitches are confirmed to fit your 2020 Honda Odyssey as listed in our fit guide. These trailer hitches basically install in the same way and are excellent options that offer a super concealed look, so it's not that one is necessarily better for your Honda Odyssey than the other, but I'll point out for you what the main differences are to help you decide which to go with. I've also attached a photo of each to show how similar...
    view full answer...
  • Comparing the Trailer Wiring Harnesses for a 2019 Honda Odyssey
    There are currently three trailer wiring harnesses available for your 2019 Honda Odyssey; the Curt T-Connector Vehicle Wiring Harness part # C56382, the T-One Vehicle Wiring Harness with Upgraded part # 118781, and the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118753. The fist two are non-powered harnesses which means you do not have to run a power wire up to the battery. The only down side of this is that this will limit the amount of lights you can power...
    view full answer...
  • Recommendation for Easiest to Install Trailer Hitch on 2020 Honda Odyssey
    For your 2020 Honda Odyssey the easiest to install 2" trailer hitch is either the etrailer.com # e98855 or the Curt # C13370 (both will install in exactly the same manner) and I give a slight edge to the etrailer.com model because of its unique matte black finish that offers a rugged appearance and isn't as prone to scratches (see attached image). This hitch will line right up to existing holes in the van's frame rails for a simple bolt-on (no-drill) installation. The only other step...
    view full answer...
  • Hidden Trailer Hitch and Trailer Wiring Recommendation for 2020 Honda Odyssey
    There are two trailer hitches with a hidden crosstube that fit your 2020 Honda Odyssey, the EcoHitch Hidden Trailer Hitch Receiver # 306-X7372 and Draw-Tite Trailer Hitch Receiver # 76170. Between these two, I highly recommend the Draw-Tite hitch because it is far more economical than the EcoHitch for the same functionality. The only difference is that the EcoHitch is made of an alloy of recycled metals, while the Draw-Tite is made from steel. Otherwise, the Draw-Tite is simply the better...
    view full answer...
  • Trailer Hitch and Wiring Harness Recommendations for 2020 Honda Odyssey
    We can help you with that. I have two hitches to recommend, the etrailer brand # e98855 and the Draw-Tite # 76170. The primary difference between the two is that the crossbar area of the Draw-Tite hitch will be concealed behind the rear bumper fascia, with only the receiver tube being visible. Most folks would prefer this option, however because the hitch installs behind the bumper fascia, installation is much more time consuming. The etrailer brand is much easier to install, but will be...
    view full answer...
  • Recommended Trailer Brake Controller and Wiring for 2019 Honda Odyssey
    Starting with the brake controller itself I highly recommend the Curt Echo # C51180 for your 2019 Honda Odyssey. This is a really unique controller that allows for an extremely simple installation that involves simply plugging it into a 7-Way connector on the vehicle and pairing to your smartphone via Bluetooth after downloading the free app. It will provide automatic proportional braking that will activate the brakes on the trailer at the same time and with the same intensity that...
    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...
    view full answer...
  • What Trailer Hitch for a 2019 Honda Odyssey EX Has The Most Concealed Look
    Correct, the actual cross tube portion of the Draw-Tite Max-Frame Trailer Hitch Receiver part # 76171 is recessed more so than the Curt Trailer Hitch Receiver part # C13370 or the etrailer.com Trailer Hitch Receiver part # E98855. The Draw-Tite hitch however does become less recessed as you get closer to the receiver tube opening. To give you a better idea of this, the distance from the center of the hitch pin hole to the outer edge of the bumper is 4" with the Draw-Tite hitch and 3" with...
    view full answer...
  • Will Trailer Hitch for 2018 Honda Odyssey Void Warranty
    The use of an aftermarket trailer hitch will not void the warranty on your 2018 Honda Odyssey. You are protected by what is called the Federal Magnusson-Moss Warranty Act, which says if something breaks on your vehicle and you take it in for warranty repair, the dealer must honor your warranty unless whatever you have added to your vehicle or its installation actually caused the problem in question. With that in mind I highly recommend the Curt # C13370 trailer hitch for your '18 Odyssey...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Edited by:
Lindsey S
Video Edited:
Jacob T
Video Edited:
Dustin K
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
Written by:
Ronnie R
Test Fit:
Shane H
Test Fit:
Robert C
Video by:
Jonathan Y
Video by:
Michael B

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