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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 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
Retail:$63.48
Our Price: $46.36
You Save: 27%
Custom Fit Vehicle Wiring

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Shipping Weight: 0.81 lbs
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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 (196)
  • Q & A (0)
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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 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   (196 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:

Easy installation great, instructional video



by:

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



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:

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



by:

Works as expected with good instruction s.



by:

Wiring harness and hitch fit perfectly in 2023 Odessey.



by:
2022 Honda Odyssey

Excellent video on installation.



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:
2024 Honda Odyssey

Haven't used the products yet, but I would give etrailer 5 stars for their immediate service.



by:

My main issue is that the video showed installation only on the Driver side, which took me 15 minutes. The Passenger side however took me several hours, the tail pipe is exactly in the worst possible spot covering all the bolt locations. Recommend adding a video on how remove an exhaust hangar. I had a friend look at it who bought a trailer from you for his 2015 Sienna and even he said that's not a 30 minute install as advertised. .



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:

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.



by:

Loved the instruction videos and pictures. Everything went together easily.



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:

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



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:
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.



by:

Works great and the customer service at etrailer is amazing.



by:

This is a solid quality product. Etrailer was quick to get it out and super helpful getting me the info and videos to get it installed. Definitely a company I will do business with again



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:
2023 Honda Odyssey

Went well. Hardest thing was connecting ground wire. By taking the one bolt off the top of the box we were able to access the treaded bolt to connect the ground wire rather than drilling. You should mention this in the directions and video.



by:

This wiring harness was an exact fit for our vehicle and works great.



by:

installed easily and works well.

Bradley

9/5/2023

Still like the product after a year rented a big U-haul trailer and it worked well with that and my little Coleman trailer.

Etrailer Expert

Mike L.

10/26/2023

@Bradley We're happy to hear that your # 118781 Tekonsha trailer wiring harness is working well for you!


by:

Super easy install. Site videos make it a snap.



by:

Easy install. Has worked flawlessly on our trips

Robyn

7/30/2023

Zero problems. Has been working great with trailering 4 bikes on trailer


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196
Show More Reviews

See what our Experts say 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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
  • Best Trailer Wiring Harness For A 2023 Honda Odyssey
    We have the perfect trailer wiring harness for your 2023 Honda Odyssey! The T-One Vehicle Wiring Harness # 118781 will provide you with a 4-flat connector and make it to where your trailer's stop, turn, and taillights will mirror your vehicle's stop, turn, and taillights. Out of the harnesses that we offer for your Odyssey the T-one has the most reliable converter box. The connector will plug into your vehicle's wiring harness, which is located behind an interior trim panel in your...
    view full answer...
  • 4-Way Wiring Harness For a 2023 Honda Odyssey
    The T-One Vehicle Wiring Harness with Upgraded Circuit Protected ModuLite HD Module # 118781 is confirmed to fit your 2023 Honda Odyssey and will provide you with the 4-way connector that you are needing. The powered ModuLite reduces the strain on your vehicles wiring system. If you are towing, you can add the etrailer Ball Mount Kit # 989900 to round out a tow package.
    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...
  • Is Trailer Wiring Required with Draw Tite Hitch that Fits 2023 Honda Odyssey
    You don't necessarily need trailer wiring with the Draw Tite hitch part # 76171 that fits your 2023 Honda Odyssey. If you won't be towing a trailer and instead carrying a bike rack or cargo carrier trailer wiring isn't needed. If you do need trailer wiring the # 118781 would be the kit to go with. It installs easily and is very reliable.
    view full answer...
  • 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...
  • 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
  • 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...
  • 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
  • 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
  • Best Ground Clearance for Trailer Hitch Receiver on 2023 Honda Odyssey
    For the best ground clearance on your 2023 Honda Odyssey you need the Draw-Tite # 76170. This hitch has a concealed cross tube so only the receiver will be hanging down at the back from maximum clearance. This hitch features a bolt-on installation and comes with a limited lifetime warranty. If you plan on towing you will also need wiring and a ball mount. The most reliable wiring is the Tekonsha # 118781. For a ball mount, I recommend the etrailer Ball Mount Kit # 989900.
    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 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
  • Recommended Hidden Trailer Hitch Receiver for Towing With 2022 Honda Odyssey Elite
    I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver # 76170 for towing with your 2022 Honda Odyssey Elite. This hitch has a concealed cross tube so only the receiver will be hanging down below the rear bumper. This will help give you additional clearance as well as provide a factory look. This is a Class III hitch with a 2" receiver. It has a max gross trailer weight of 3,500 lbs and 525 lbs for your towing needs. Since you plan on towing, you will also need wiring and a ball mount....
    view full answer...
    Image 1 for
  • 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
  • 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...
  • Best 4-Way Trailer Wiring Harness for 2023 Honda Odyssey
    The best 4-flat trailer wiring harness for your 2023 Honda Odyssey is from Tekonsha: - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118781 The # 118781 harness is the best because we have found over time that Tekonsha makes the most reliable trailer wiring harnesses in the industry. This harness also has the highest amp ratings, which means it gives your Odyssey the best prevention against any potential shorts.
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

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

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