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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

Item # 118336
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118336 - Custom Fit - Tekonsha
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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. Includes tail light converter. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118336 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 (1138)
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Tekonsha Custom Fit Vehicle Wiring - 118336

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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. Includes tail light converter.


  • 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 - no cutting or splicing of wires
    • Locate connection point in rear cargo area
    • Plug in connector
  • Includes a tail light converter 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


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 4 amps per circuit
  • 1-Year limited warranty

Tail Light Converter

A tail light converter 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. The tail light converter combines 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.

118336 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118336 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 - 118336

Average Customer Rating:  4.9 out of 5 stars   (1137 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. Includes tail light converter.


The hitch is compatible to Honda CR-V (model 1998) and apparently fits well. One must be careful to adjust the exhaust system and check the engine rotation for smooth operation, otherwise it could produce noise. The electrical wiring is easy to install with little effort. My purpose is specifically to haul garden and landscaping items and this is a worth spending.

1993 Honda Pilot

On '93 Honda Pilot, installed wiring harness in about 20 minutes. Also installed Draw-Tite tow bar (75599) and Tow Ready 4-Flat Universal Mounting Bracket (118149) to stow wiring harness plug. None of the wiring harness is visible from rear of vehicle with only 4 - 6 inches underneath. All of the wire is tucked away in rear threshold where I found two grommets leading underneath the vehicle. After cutting out a space in the grommets for the wire harness to run I reinstalled grommets back into place. Very neat install, wire is snug behind threshold where plug was located. Worked as advertised.

No problems at all one year after the install.
CW - 03/27/2015

2000 Honda V6

I had an old wood stove that needed to be transported to the metal scrap heap at the local landfill. The hitch and drawbar were already in my possession but I needed trailer wiring for a rental trailer. I looked at the trailer rental store's offering of a generic harness that involved splicing as part of the installation process; I suppose it would work just fine but this product seemed to be much easier to install. After the removal of three trunk lining fasteners I had access to the wiring plug that is standard issue for my Honda. I connected the etrailer mating half of the plug to the Honda plug, fussed with the location of the "box" and the wiring a little and I was done except for verifying with a voltmeter that all the functions were working. When not in use the bulk of the wiring is hidden in the spare tire well underneath the trunk floor panel.
This harness works just fine on my 2000 Honda V6. I'm happy.


Easy to install. Ran the wires down through some plugs in the body and silicone them up. Cut the end off and wired it to a 7 round that I connected to the hitch using a bracket.


Hi Carol,
The product gets five stars!
All works well. (Carol) I assume is the person I spoke with when my order had fallen out of the box because of no tape used only staples. The representative whom I contacted for parts missing (twice) and once the complete wrong part.. gets six stars!!!!! for sticking with it getting me my parts with an excellent attitude.
The packing department gets 2 stars.
All good now.
Thank you


The Part exactly fit my 2001 MDX, received on time as scheduled.
Thanks to etrailer team.

It is great product, issue free and reliable
Riyadh - 07/30/2022


One year later this is still holding up just as the day I put it on! A little electrical grease goes a long way in protecting the terminals from any and all corrosion!


I didn't have to pull off the rubber door gasket but I did have to remove the plastic piece across the back which broke the plastic fasteners. I think I needed a Phillips screwdriver and 10 mm socket wrench. I used the double stick tape that came attached to the module and didn't bother with the screw, where it is located I don't think is going to move. There is a cigarette lighter socket that should be removed before pulling the panel out but even without taking that step it wasn't hard to straighten the tabs and plug it back in to the connector.

About a 20 minute job, not difficult.

Still working well after a year.
Christopher T - 07/18/2020


The wiring harness worked well..The instruction sheet did not cover my vehicle..


The writing harness works perfect for us on our Honda CRV.


No issues what so ever just plug it in and ur good

After a year still no issues. Works great
Jacob - 05/13/2022


We have 4 CRVs and 1 Pilot all rigged with the base plate. Good product. Never an issue. The most recent purchase was for the Pilot. No problems for installation and use. Install on Pilot was a little more difficult not because we weer also installing Transmission cooler- but no issues.


Arrived on-time. Installation instructions were easy to follow. Wiring harness was super easy. Just towed a 5,000 lb trailer from Home Depot to my house. Saved $200 since I was able to tow it myself.


Easy installation, works great. Very satisfied with the wiring harness.


The trailer wiring harness worked perfectly. Getting the panels off my Honda Element was a job but the wiring harness worked as intended.

2006 Honda CR-V

This hitch was exactly as advertised and fit my CRV perfectly!!! Used spray bottle with soap & water to lube the two upper muffler rear hangers and they slid off with little prying needed (did not need to remove the lower hanger in front of muffler). etrailer's installation videos for installing both this hitch and corresponding 118336 wiring harness were spot-on and very helpful (also a good video on the Curt website). Took my time tightening the hitch bolts to specs which was a bit awkward until I thought to use my ratchet extension bars. Maybe the easiest "car repair" I've ever done, and probably saved a lot of $$$ doing it myself. If you can change your oil, you can do this installation no problem!
Also, etrailer promptly shipped this product for free (thanks, guys!) and it got here a day early. GREAT COMPANY! When I save up enough to buy roof rack rails in the near future, I'll be back...


Item was as described good quality and price and worked well for my application.


Such an easy installation. Directions were spot on.


Worked great for my 2004 Honda Pilot. It was an easy plug-and-play installation. I did not rout the 4-pin connector to the exterior of the vehicle since I don't tow frequently. I just left it inside under the storage well where I can access it and drape it over the bumper when needed. The hatch seal can close over the flat cable without damaging it.


Great product would recommend it to anybody easy installation just as described awesome job

2003 Honda Pilot

The trailer wiring harness was a great solution and I have attached some pics of how i ran the wires for the installation. I found some access holes in my 03 Honda Pilot to avoid pinching the wires in the liftgate.


Arrived way sooner than expected. Simple plug in installation. Job done in under 10 minutes. Works perfectly.

2005 Honda Element

As advertised, fit an '03 Element perfectly. hardest bit was getting at the vehicle connector, which is behind interior body panels for some reason (in this case, passenger side rear. On 2005 models and after there was a design change, you may want to look out for that). Routing the wires for easy access was straightforward as well. etrailer shipped quickly and item arrived well before expected.


Products that I ordered was delivered a day earlier and works fine.

2008 Honda Pilot

Fastest delivery I have ever had. Ordered Wednesday at 5PM, arrived Thursday at 3PM. I'm only a couple hundred miles from Wentzville, but still, excellent. The hitch receiver (2008 Pilot) installed quickly and easily. No need to remove spare or lower muffler. I supported the left end on a large cooler and quickly maneuvered the right side above the tail pipes. The mounting holes were right on target. I had to tap mine to remove rust, but that's easy as well. The wiring harness was also a snapto install. Simple to plug into existing fitting and the wiring box tucked away nicely beneath the trim as advertised. There are options about what to do with the wiring tail and trailer connector. I chose the method shown in the video...leave it rubber-banded in the storage well. Others have run it outside through available holes, but I did not want to leave it exposed to road grime. etrailer's videos were very detailed and shown on my specific vehicle for both the hitch and the wiring harness. Good values as well. If I were Draw-Tite (or Curt) I would include a complementary rubber plug with their advertising.

All products holding up well. Easy install, good quality. Works as advertised.
MoHusker - 09/08/2018

Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • T-One Vehicle Wiring Harness Designed to be Closed in The Hatch When In Use
    The flat four pole trailer connector for your vehicle is designed to be stored in the cargo area until needed. When towing a trailer you can pull the wiring out through the back hatch and simply close the door on it making sure the wiring is not near the door latch.
    view full answer...
  • Wiring Instructions for Part # 118336 on a 2003 Honda CRV
    I do not have a video showing that install, but I have added a link to the instructions provided by the manufacturer for that wiring harness, part # 118336. Please refer to page 3 for the instructions that are specific to your vehicle.
    view full answer...
  • T-One Vehicle Wiring Harness Not Working as it Should
    Hi, I am sorry you are having trouble with your trailer wiring. You need to test the wires on both sides of the converter box. On the car side you will have 5 wires and on the trailer side you will have 4 wires. The extra red wire on the car side will be your brakes and the converter transfers that over to the yellow (left turn) and Green (right turn) wires to allow your cars 5 wire system to work with the trailers 4 wire system. The brown wire is the tail lights and the white wire is the...
    view full answer...
  • What is the Wiring Loom Mentioned in the T-Connector Installation Instructions
    The wiring loom is the black plastic protective cover that is installed around a bundle of wires. The connector for the wiring harness will be taped down to the wiring loom at the factory to keep it from rattling and creating a annoyance that will cause customers to return the vehicle to have fixed. Once you have the connector located and remove the tape the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, item # 118336, will just plug into the factory supplied trailer connector,...
    view full answer...
  • Testing Tow Ready Custom Fit Vehicle Wiring, # 118336 For Correct Functions on a 2005 Honda CR-V
    You could have a problem with the converter box in the Tow Ready Custom Fit Vehicle Wiring, # 118336, but to be sure, I would test the connector with something other than a plug in style test light. A trailer or a circuit tester like the Quickee # 3808 would be better. Some times, the plug type testers can cause a malfunction. To eliminate it as the problem another testing method will need to be done. With a trailer hooked up, you would simply run through the functions; left, right turn...
    view full answer...
  • Locating Install Harness for Trailer Wiring in a 2000 Honda CR-V
    It sounds like your 2000 Honda CR-V is set up like the newer CR-Vs and the harness is actually behind the rear threshold. Check out the video I attached for more info on this. This harness fits several vehicles and all of them have different places that they hide the harness so I would check out the install instructions to see where the harness is typically located in other vehicles to give you more places to look.
    view full answer...
  • Troubleshooting Trailer Taillights that Don't Function Consistently
    This sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare...
    view full answer...
  • Troubleshooting Reverse Lights that Illuminate on Trailer when Brakes are Applied
    Based on what you described and the fact that the trailer wiring harness part # 118336 is a plug-in harness I would suspect that the trailer wiring harness on your trailer is wire incorrectly. It sounds like the stop/turn signal on your trailer has been mistakenly been swapped with the reverse light circuit. When looking at the 4-way on your trailer the jacketed pin is the ground circuit, the one next to it should be the running lights, next to that should be left turn/stop, and the last...
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for a 2011 Honda Pilot
    For trailer wiring for your 2011 Honda Pilot you would want the Tow Ready harness part # 118491 as it has been confirmed to fit your vehicle and will provide you with a 4-way trailer connection. I attached an install video for you to check out as well.
    view full answer...
  • Trailer Wiring Installation Instructions for a 1991 Acura Integra
    The only available trailer wiring option for your 1991 Acura Integra would be the Upgraded Circuit Protected Taillight Converter Hardwire Kit, # 119175KIT. There is no T-one plug and play style harness for your vehicle. Installation of the 119175KIT is actually pretty easy, even with little experience. I have included a couple of videos showing typical installations of this wiring harness. Basically, all you will need to do is to access the wiring behind each tail light. Using the included...
    view full answer...
  • How to Route Trailer Wiring After Making the Connections on a 2004 Honda Element
    You are correct, the instructions, linked for reference, do not specify how you would run the 4-Way from the connection point on your 2004 Honda Element to he out side of the vehicle. There are a couple of ways you can do this. First, you can stow the 4-Way in the vehicle and then when needed, pull it out of the back door/hatch. You can close the hatch on the wiring as long as it is not pinched in a locking or hinging mechanism. The weather stripping on the rear door will prevent the...
    view full answer...
  • Replacing OEM Trailer Wiring Harness with # 118336 for 2004 Honda Pilot
    Lets begin with the purpose of the converter box. The wiring system that trailers use is very simple. The turn signal and the brake lights are carried on the same circuit. The left turn and brake light signals are carried in the yellow wire down the drivers side of the trailer, and the right turn and brake light signals are carried on the green wire running down the passenger side. This is the tried-and-true system that has been used for years. The converter comes in when you have a vehicle...
    view full answer...
    Image 1 for
  • What is Purpose of Converter Box On Tow Ready T-One Wiring Harness # 118336 For 2004 Acura MDX
    The black converter box on Tow Ready T-One Wiring Harness, part # 118336, is for use with vehicles, like your 2004 Acura MDX that have separate turn and brake light wires. Some vehicles send only one signal per wire, creating what is called a 3-wire system: one wire for the left turn, one wire for the right turn, and one wire for the brake signal (common on vehicles with amber turn signals). A converter will reduce it to a standard 2-wire system needed for wiring a trailer. There are still...
    view full answer...
  • Is there a Fuse that Needs to be Installed on a 2004 Honda Element for Wiring Harness
    There should be a 7.5 amp fuse that will need to be installed in the fuse box when you install the T-One Vehicle Wiring Harness # 118336. You will need to check with your local regulations and laws to determine if you need to have side clearance lights on your trailer before you remove them. Another option to reduce the amperage draw on your trailer would be to convert the lights on the trailer to LEDs as they draw considerably less than incandescent bulbs. Check out the link I provided...
    view full answer...
  • Trailer Wiring Harness Installation on 2004 Acura MDX
    We offer three choices in a custom-fit (no-splicing) trailer wiring harness for your 2004 Acura MDX. All can be seen on the link provided, including the one I suggest, Tow Ready # 118336. Each one includes a powered tail light converter box that generates the lighting signals for your trailer. These boxes are not designed to be exposed to the elements, but instead are intended to remain inside the vehicle where they are protected. However, you may be able to find a wiring grommet or other...
    view full answer...
  • Replacement 4-Way Wiring Harness Recommendation for a 2005 Acura MDX
    What I would recommend you do is start with the Tow Ready 4-Way harness part # 118336, cut the 4-way off of the harness and then wire the aftermarket 5-way you purchased to it in it's place. For the fifth circuit of the 5-way you would need to run that to your reverse light circuit or to whatever circuit you need. I attached an install video for this harness to the right plus an FAQ on troubleshooting 4-way installs for you to check out as well.
    view full answer...
  • Trailer Running Lights Do Not Work When Towing with 2003 Honda Element
    All of the trailer wiring harnesses for the 2003 Honda Element (# 118336, # C55336, and # 43105) plug into the factory connection point on the vehicle. This makes me think that the issue could be a blown or missing fuse. Check the vehicle owners manual for the fuse locations for towing or trailering to see if any are blown or missing. You can test the wiring harness by following the help article I have linked to the right. If everything checks out on the vehicle then it indicates a problem...
    view full answer...
  • Where to Find the Connector on a 2000 Honda Accord to Install Wiring Harness # 118336
    To find the trailer wiring connection point on your 2000 Honda Accord to install the Trailer Wiring Harness part # 118336 you will need to Unscrew the knob securing the access panel on the driver’s side of the vehicle’s trunk. Remove the access panel to expose the vehicle’s wiring harness and connector.
    view full answer...
    Image 1 for
  • Location of Passenger Side Panel to Install the T-One # 118336 on a 2004 Honda Element
    The passenger side trim panel is located at the rear of your 2004 Honda Element. When you open the rear hatch on your Element it is the panel directly to your right. This is where you will connect the Tekonsha T-One # 118336. Before removing the side panel you do need to remove the cargo door on the floor and also remove the screws holding the spring loaded hinge cover. I have linked the installation details to this answer page for you to check out.
    view full answer...
  • Do Fuses have to be Installed to Activate Trailer Wiring Harness on a 2006 Honda Pilot
    You may not have to install any fuses to activate trailer wiring harness # 118336 on a 2006 Honda Pilot. But in the event that there is no power on the 4-Way after installation then I do believe that it is that trailer accessory fuse you mentioned.
    view full answer...
  • Will Installation of a Trailer Wiring Harness Affect on the Speakers in a 2000 Honda CR-V
    Installation of trailer wiring harness # 118336 will not affect the speakers on your 2000 Honda CR-V. The harness plugs into a mating connector on the vehicle that is otherwise not being used and it is not tied into the speakers. I have included a link to a video showing an installation of this harness for you.
    view full answer...
  • Trailer Running Lights Not Working on Trailer Towed by a 2003 Honda Pilot
    Some tow package wiring harnesses on vehicles can overcome ground issues better than others. Although the trailer works with other vehicles, since some vehicles are more sensitive about ground issues, a ground problem on your trailer could still be causing the problem you are experiencing. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the...
    view full answer...
  • Left Side Trailer Lights Don't Work When Towing with 2003 Honda Pilot
    I agree that it sounds like you have a ground issue. Ground problems often present themselves through strange wiring issues. Having a ground issue may not cause all of the trailer lights not to work. It is not uncommon for only one side of the trailer lights to not work, or the lights to dim when the blinker is used, when there is a ground issue. When stripped back, a black ground wire would more likely indicated that it has somehow been fried, not corroded. Corrosion usually presents...
    view full answer...
  • Install Instructions and Video for Tow Ready Wiring Harness part # 118336
    I attached a link to the install instructions for the Tow Ready wiring harness part # 118336 as well as attached an install video that will walk you through the entire process.
    view full answer...

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