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T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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118741 - Custom Fit Tekonsha Custom Fit Vehicle Wiring
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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 - 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 118741 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price 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 (523)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring

  • 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 wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.


  • 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 point in rear cargo area
    • Plug in T-connector
  • Includes ModuLite power converter to ensure that your vehicle's wiring matches that of your trailer
    • Powered module draws power from fuse to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located in your rear cargo area, behind the driver's-side interior trim panel. Once you've plugged in the T-connector, open the fuse compartment beneath the driver's-side dash. Locate the fuse position indicated in the instructions, then insert the included fuse.

Once installation is complete, the 4-way flat 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.

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.

118741 Tekonsha T-1 T-Connector - 4 Wire - Modu-Lite Converter Included

Item # 118741

Installation Details 118741 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118741

Average Customer Rating:  4.9 out of 5 stars   (523 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 - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.


Received the product well packaged with no damage and all hardware was present. followed written and video instructions to install hitch and wiring harness on my 2022 Honda CR-V EXL. Had a difficult time aligning the hitch initially. I found the factory had stowed the connector for a rear hatch foot motion sensor(not mounted on this vehicle) on the left rear inner bumper. I had to relocate that and had no further problems with installation. The wiring harness installation was uneventful. The look and stability of the etrailer hitch is great. This is the 4th one of these I've installed and they all look great and the finish holds well over time.


This wiring harness was fairly simple to install myself thanks to the helpful video demonstrations. It took me approximately 30 minutes going slowly and cautiously. It worked like a charm the first time I tested it.


I installed the Draw-Tite 76128 Hitch, the 118741 wiring harness and the 18144 bracket to mount the wiring plug. You can route the plug through the hole that is provided for the factory hitch wiring (it will fit through, but it is tight) and use the bracket to clean up the install. It looks pretty sweet doing it this way.

I am still very satisfied with the installation as well as the products. They were put to use about a month ago towing a trailer from Central Vermont to Southeast Ohio. That was about 800 miles and absolutely no trouble.
TomB. - 06/28/2018


Everything is as stated! With etrailer, I’ve learned that I can trust their products to perform. No worries about compatibility, these guys know their stuff. Fit perfectly on my 2017 Honda CRV. Thanks etrailer!


The wiring harness has served us well this year. It was easily installed and worked as advertised.


I was able to install this harness without a lot of drama. The hardest part was getting access behind the panels and breaking a couple of fasteners. Patient people will have less trouble installing this.

2022 Honda CR-V

Very pleased with this wiring package. eTrailer had a great video showing how to install the wiring in a 2021 Honda CR-V. I could not have figured out how to remove the rear cargo panel properly without the video. *BTW - I purchased a grommet removal tool package prior to ordering this and I didn't have any problems with removal of anything. Veru happy with my purchase from


I have purchased hitches and wiring from etrailer three times. Each time, the products arrived quickly, fit perfectly, instructions were crystal clear, and the transaction was quick and painless. This hitch for the CR-V was perfect, solid and relatively easy to install.

The wiring kit was a little tougher but mostly because removing the interior trim was challenging for me. There was a difference between the etrailer wiring installation and the Honda harness: the etrailer harness lies in the back of the vehicle, on top of the spare when not in use, avoiding the need to remove the rubber plug to route the wire out of the spare tire compartment. The dealership told me that failing to seal that hole sufficiently would cause the compartment to take on water when driving in rain. Routing the wire through the bottom of the door is not a problem for occasional use, but doing this frequently might cause the wire to wear and fail after some period of time. This does make for a clean installation, as you don’t see the harness at all the 99% of the time you are not using the hitch. If I were going to use the hitch really frequently, I would opt for a wiring package that resealed that compartment and permanently attaches the connector near the hitch.

Works fine, no problem with reliability. I probably should have opted for the one that puts the wire through the compartment.
William J - 11/09/2021

2022 Honda CR-V

Installation wasn't crazy, but more guidance on where to put the small black box would be helpful. I just ended up using some zip-ties to strap it to a hole in the frame. It works perfectly and no issues with the hands-free liftgate on my CRV hybrid.


The wiring harness and hitch worked perfectly by following the installation video instructions. Thank you for great products, instructions, and service!

Volvo Cross Country

Worked perfectly for our move. Install was easy with basic tools and as described. Haven't used it much since but it survived and worked for our cross country move with a U-Haul trailer. Note U-Haul will check to make sure trailer lights work so you need one of these if you're going to tow.


Instructions and harness were spot on with no problems. I recommend this CRV application


This wiring harness works great. Had very little trouble installing it. Took it on a trip and had no issues.

2021 Honda CR-V

Ordered a trailer hitch, a hitch cargo carrier, an air lift setup and a t-one vehicle wiring kit. Everything arrived within 5 days. Haven't installed anything yet but Everything made it through shipping just fine. Thanks


The hitch works perfect. Instructions and hardware supplied are exactly what you need. Wiring harness is easily plugged in. I’m a do it yourself person and 68 years old and it was no problem.


I bought this a year ago, and it’s fantastic! I’ve never had any issues with it. The installation (‘17 Honda CRV) took over an hour because some of the bolts were hard to reach and I was doing it alone, but it is a much easier installation that many other harnesses I’ve installed. I connect it to my Kendon trailer and I’ve never had a problem with it. Really great product for a great price!

2017 Honda CR-V

E trailer makes thigs easy and their products are excellent. I have purchased hitches and light kits. Great clear instructions and customer service!!!


Fast shipping, quality product, fit is good, install easy.
Very nice hitch, I am very happy with it.

2022 Honda CR-V

Installed on 2022 Honda CRV and you have to take out a bit of the paneling to get to the plug for this but not very hard to do at all and lights o. Trailer work fine so far.


Great product at a great price. Only suggestion would be to have a way to connect to the trailer wiring without having it being closed on by the tailgate of my CRV. I ultimately ran the cable into my spare tire compartment and then drilled a hole out near my trailer hitch and installed a grommet. Works and looks great but I had to cut the trailer connector off the T1 harness to dress the wires through my new hole and then reconnect it. The whole e-trailer experience and products were fabulous. I have a hitch and wiring harness that are as good as the Honda hitch/harness for hundreds of dollars less.


Very good service and I received the order in a reasonable time. The trailer hitch is a very easy to install and the trailer wiring harness also. Thank you and I will definitely be using your company again, 5 stars. Nelson B. Québec, Canada.


It worked as expected, thanks. Previous one I had purchased from a different company did not work correctly but did not test after installation and found out that left signal did not work when towing a trailer (6 months lter).


Well made! You will have to remember the inline fuse in behind the panel on a Honda CRV


This module was truly plug and play on my 2019 Honda CR-V. Your installation videos are excellent. I would suggest anyone buying this harness purchase themselves a set of inexpensive trim/panel removal tools, which are indispensable for panel removal. Thanks a lot.

2017 Honda CR-V

I had the hitch painted to match the car. Installation was quick only taking about 30 minutes. The only issue I'm having is the sensor to open the lift gate won't work all the time now.

Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • 4-Way Trailer Wiring Harness Recommendation for 2018 Honda CR-V
    The Tekonsha harness part # 118741 that you referenced is a fit for the AWD and FWD versions of the 2018 Honda CR-V. I attached a link to an install video for this kit on a 2018 CR-V for you to check out as well.
    view full answer...
  • Recommended Trailer Wiring Harness for 2018 Honda CR-V
    For your 2018 Honda CR-V I recommend the T-One Vehicle Wiring Harness # 118741. This custom harness will plug right into the factory port located on the driver's side interior trim panel in the rear cargo area. It has the highest amp rating available for your vehicle and Tekonsha is well known for making extremely reliable products. This will provide you with a 4-Way connector to connect with and power a trailer's basic signal lights. I have attached an installation video on the 2018...
    view full answer...
  • Recommended Trailer Wiring for 2019 Honda CR-V
    For your 2019 Honda CR-V the Tekonsha T-One Vehicle Wiring Harness # 118741 will work perfectly. This is a custom "plug-and-play" harness that features a high amp capacity for the lights and comes with Tekonsha's great reputation for manufacturing durable and reliable electrical products. To install the harness you simply need to plug it into a factory port located behind the driver's side trim panel (see attached image) and insert the included fuse beneath the driver's-side dash. This...
    view full answer...
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  • Help Finding Connector for Installing Trailer Wiring in 2019 Honda CR-V
    It's possible you may have found the wrong harness to plug in the Tekonsha trailer wiring harness part # 118741 into. We had the chance to install this kit in a 2019 CR-V which I attached a link to the install video for that might be helpful for you to check out. Sometimes the correct harness can be harder to find as it can be buried behind other harnesses. If you check out install video around the 5 minute mark you'll see exactly where to find the connector behind the rear interior panels.
    view full answer...
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  • Does Trailer Wiring for 2017 Honda CRV EX Require Running Wire Up to Vehicle Battery
    The trailer wiring harness for your 2017 Honda CR-V part # 118741 will not require you to run wires up to the vehicle battery. The power source the harness needs is present at the rear of the vehicle already as it's basically pre-wired from the factory for adding trailer wiring.
    view full answer...
  • How to Remove Panels on 2017 Honda CR-V to Install Trailer Wiring Harness
    To install the trailer wiring harness # 118741 on a 2017 Honda CR-V there is a decent amount of paneling that needs to be removed or at least released. You'll need to take out the spare tire cover and then the scuff panel. Then there is a tab behind the rear seat release handle. Once you have the tab out you'll release the clips along the edge of the driver's side wall panel. I've linked a video that shows the install for you.
    view full answer...
  • Does the T-One Vehicle Wiring Harness # 118741 Come With Instructions for a 2017 Honda CR-V
    Yes, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118741 comes with instructions and pictures on how to properly install the harness on your 2017 Honda CR-V.
    view full answer...
  • Wiring Diagram and Installation Details for Tekonsha T-One Vehicle Wiring Harness on 2017 Honda CR-V
    I have attached an image of the correct wiring installation details on the Tekonsha T-One Vehicle Wiring Harness # 118741 for a 2017 Honda CR-V. This will be installed to provide a 4-way flat trailer connector at the back of the CR-V to power the trailer's signal lights. Since the installation of this harness just involves a connector being plugged in, a wiring diagram is not available or required for proper installation.
    view full answer...
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  • Where is Trailer Wiring Connector on 2017 Honda CR-V for Installing Trailer Wiring
    I attached an install video for the T-One trailer wiring harness part # 118741 that you referenced on a 2017 Honda CR-V just like yours for you to check out. At the 2:30 mark of the video you'll see our installer digging pretty deep into the driver side panel of the vehicle to find the connector you are looking for.
    view full answer...
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  • Tips for Flexing Interior Panels to Install Trailer Wiring Harness on 2017 Honda CR-V
    Judging by the short sleeves and the time of year the video for the # 118741 was made (appears to be spring time based on the install pic we took of the hitch that I attached), I would say most likely somewhere in the 70 degree range. It may not be super convenient, but if you are in a cold climate you could wait to do the install till you have a warm day, or wait till after you drove the vehicle for a while with the heat on to warm up the interior panels so they'll flex a bit more.
    view full answer...
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  • Does Trailer Wiring for 2017 Honda CRV Require Additional Relay
    The trailer wiring kit part # 118741 that you referenced which is a fit for your 2017 Honda CR-V does not require any relays to install. We had the chance to install this kit on a similar 2017 Honda CR-V as yours and it did not require any additional relays. Check out the install video I attached for more info on that as well.
    view full answer...
  • Is 6-Pin Connector There to Install Wiring Harness 118741 on 2018 Honda CR-V EX-L
    The 6-pin connector is definitely in your 2018 Honda CR-V, though sometimes, finding them can be a real pain. The best advice I can give you is just to continue looking, though it's difficult to orient exactly where you should keep looking based on your photos (I believe they are oriented to the side). I believe if you keep looking up above, and follow the wire loom you will find it. The connector may in fact be completely covered in tape and not obvious to the naked eye, but it will definitely...
    view full answer...
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  • Trouble Locating Tow Package Port On 2019 Honda CR-V AWD
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118741 is a great option for a 2019 Honda CR-V AWD. It is a fit for all models as the factory tow package port will be present on all models. Unfortunately, the tow package port can be difficult to locate. It's actually up a little higher than normal behind the top panel. I have attached an install video for you below as well.
    view full answer...
  • How do I get the Trailer Harness Outside of My CR-V?
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118741 hangs over the back bumper through the rear cargo area when it is in use. The door closing on the wires will not damage it. When its not in use you just roll it up and secure it underneath the floor in your CR-V.
    view full answer...
  • Troubleshooting Liftgate Not Functioning After Installation of 4-Way Wiring Harness on 2020 CR-V
    The first thing I would do is uninstall the # 118741 wiring harness to see if the rear hatch functions once it is removed. This will help you narrow down the problem. If this fixes the issue then I would try double checking the ground and make sure the connections are secure. If this does not fix the problem then there is an issue with the vehicle. I would again say to check the ground connections to make sure they are secure. The instructions specifically have a note to make sure all...
    view full answer...
  • Maximum Towing Capacity of a 2018 Honda CR-V
    I took a look at the online version of the owner's manual for your 2018 Honda CR-V. Under the "Towing a Trailer" section it lists a maximum trailer weight of 1,500 pounds. This is the heaviest trailer your CR-V can safely pull. In order to tow a trailer you will need a trailer hitch, wiring harness, and ball mount. Starting with the hitch I recommend the Draw-Tite Class III Max Frame Round Tube Receiver Hitch # 76128 as it features the highest weight capacities and easiest installation...
    view full answer...
    Image 1 for
  • Will Wiring Harness for 2018 Honda CR-V Drain Car Battery
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118741 that fits your 2018 Honda CR-V will not drain your car's battery. It will only pull power when your Honda is actually on so, meaning it will not have any affect on the battery. I have added a link to a video of this connector being installed on an '18 CR-V for you to take a look at as well. For a trailer hitch on your 2018 Honda CR-V I recommend the Draw-Tite Max-Frame Trailer Hitch # 76128 because it is an easy,...
    view full answer...
  • Installation of Draw-Tite Class II Trailer Hitch Receiver for 2017 Honda CR-V
    I've linked a video of the Draw-Tite Class II Trailer Hitch Receiver # 36597 being installed on a 2017 Honda CR-V. Unfortunately, a copy of the instructions isn't available to use yet. The wiring harness for the CR-V is # 118741 which we don't have a video for as of yet. We likely will soon. The installation is fairly simple. It plugs directly into the wiring of the CR-V behind a trim panel on the driver's side in the rear cargo area. Then after the harness is connected you'll need...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2018 Honda CR-V
    We do offer 4-way trailer wiring that fits your 2018 Honda CR-V. For that you'd want the T-One kit part # 118741 which is a confirmed fit and would work well. I attached an install video for this harness on a 2018 CR-V just like yours.
    view full answer...
  • Trouble Activating Liftgate on 2017 Honda CR-V After Installing Wiring Harness and Trailer Hitch
    I spoke with my contact at Tekonsha who said that you shouldn't be experiencing a problem with your liftgate on your 2017 Honda CR-V after installing the Tekonsha T-One # 118741. If you possibly cut or moved some wiring around other than what you needed to for the installation then that could very well be why you are having problems. I was able to see that you also purchased the Draw-Tite Max-Frame Trailer Hitch Receiver # 76128 for your CR-V as well. If the problem is that you are having...
    view full answer...
  • Will Draw-Tite Trailer Hitch Interfere with Kick Sensor on 2018 Honda CR-V
    The Draw-Tite Max-Frame Trailer Hitch Receiver # 76128 referenced in your question is confirmed to fit your 2018 Honda CR-V Touring. I spoke with my contact at Draw-Tite and he stated that the hitch will work with the kick sensor below the bumper, but you may just have to kick your foot around a little more for it to activate. The "eye" of the sensor will simply be limited just a bit, but it will still work absolutely fine. This Class III hitch will use existing holes in your CR-V's frame...
    view full answer...
  • Trailer Hitch That Does Not Require Fascia Trimming and Wiring Harness For A 2019 Honda CR-V
    I understand your reluctance to cut the fascia of your 2019 Honda CR-V. I recommend the Draw-Tite Class III Max-Frame Trailer Hitch Receiver part # 76128 which is the only option for the 2019 Honda CR-V that does not require fascia trimming because of where the hitch attaches to the frame. I have attached a photo and installation video for your reference. For the wiring, I recommend T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118741 which has the highest amp...
    view full answer...
  • Troubleshooting 4-Pin Trailer Harness for 2020 Honda CR-V
    It sounds like you may not have the correct harness and in some cases the 2020 Honda CR-V has a different harness for the AWD versus the FWD version with some manufacturers. I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118741 which is compatible with either AWD or FWD versions. I've linked the page to all of the trailer wiring options. If you have one of these harnesses and have that issue, then it sounds like there is a ground connection...
    view full answer...
  • Do All 2018 Honda CR-Vs Have Factory 6-Pin Connector Present for Trailer Wiring
    You don't necessarily need to have a tow package on your 2018 Honda CR-V to be able to install the Tekonsha T-One Vehicle Wiring Harness, part # 118741. All 2017-2020 CR-V's have a 6-pin connector present behind the driver's side trim panel, so the # 118741 harness is confirmed to fit all models of the CR-V (model years mentioned above). Take a look at the pictures in the attached installation instructions which show step by step directions on how to access this factory connector. I've...
    view full answer...

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