bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118336
Our Price: $34.74
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 0.69 lbs
Add to cart
In Stock
Custom Fit Vehicle Wiring 118336 - Custom Fit - Tekonsha
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118336 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (1181)
  • Q & A (0)
  • Photos

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 Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118336

Average Customer Rating:  4.9 out of 5 stars   (1181 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.


Greetings, the plug was easy, the play not so much. After renting a bike trailer from U-Haul the park lights didn’t work. Returning home I bought a flat four plug tester, park lights weren’t working. I wrote their web site to give them a chance to correct it before this review, no response. Not very pleased…hopefully I’ll hear something now

Etrailer Expert

Katrina D.


There are a couple of reasons that this harness would not be working. Have you had a chance to check the wires on the vehicle side, as well as the trailer side? If not, I would highly recommend using a circuit tester, like part # PTW2993 to test the wiring on both sides. Also, be sure to test the wiring going to and from the converter box. First test the wires going into the converter box. If they are fine, move onto the wires coming out of the converter. If you have power coming into the converter but not out, then we will need to get a replacement out to you, because the converter is bad. Let me know if this helps.

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.


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.

Christopher M.


Still working well after a year.


Such an easy installation. Directions were spot on.



I have been using this harness for a year with a small utility trailer and my Honda CRV. Easy installation with very clear photos and instructions worked great for me. Quick response and delivery from etrailer was great.

Etrailer Expert

Mike L.


@Charles Great, thanks for checking in!

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.

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.


Simple install - works great, not much else to say here...


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



Excellent product still, I would buy another one for my next car as well.


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.

2007 Honda Pilot

Fast fast delivery. Solid product. They go the extra miles to include helpful videos. Id recommend


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

Honda CR-V

Haven't fully tested it, but installation was easier than anticipated. I recommend watching the video for options for routing the wires to the storage compartment in the CR-V. I cut a small slit in the corner, closest to the bumper, of the storage compartment and pulled the wires through. Honda provides a great place to store the wires! -A.

2006 Honda Pilot

I installed the 4 pin quick connect harness and the ETBC7 universal 7 pin kit on my 2006 Honda Pilot EXL to get it ready for towing our popup camper. The instructions are clear and the installation was fairly easy but did take over 4 hours start to finish. Connected to a tekonsha voyager BC taken from our old tow vehicle. The installation looks professional, I know it was done right, and saved about $200.

2004 Honda CR-V

amazing hitch Perfect fit made with high quality and very easy install, from all the hardware necessary to tools to make the job even easier, all wiring was plug and play and very detailed instructions, I wouldnt buy from anyone else!

2005 Honda Pilot

Product functioned as expected. The fact that harness can be stored in vehicle is good. Thanks

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...


not happy, received opened damaged box, the old saying trying top put ten pounds of [crap] in a five pound bag! missing electrical connector, then I had to send pictures like they think I'm a liar!

Etrailer Expert

Brooke M.


Thanks for reaching out about this. I am glad to see that customer service is in the process of helping you with this. We are sorry to hear that you have to go through this whole process.


Items were packed pretty well, nothing seemed to have moved or been damaged during shipping. Part fit as good as OEM, all hardware was correct and the harness fit perfectly.


The harness fit properly, worked properly. That's all you can really ask of a harness.

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.

2004 Honda Element

This was pretty easy to install and works great on my trailer. The installation instructions were not exactly correct for my 2004 Honda Element AWD Ex. The number of screws and plastic plugs that needed to be removed to pull the passenger side trim panel clear to access the vehicle's connector did not match the instructions. I found it essential to unbolt the right rear shoulder strap from the floor of the vehicle. This allowed much better access to the wiring behind the panel to plug in the connector for the harness. The adhesive on the black box that comes with the harness was weak, and didn't stick to anything behind the panel.



Yes I still like them!

2003 Honda Pilot

Great product! Installed on a 2003 Honda Pilot. Easy installation. Removed trim plate at rear of cargo area without any tools. There was a plug under the plate that you simply plug the wiring harness into. I leave the wiring harness in the storage area for the head rests when not in use. When I need it I pull it out connect it to my trailer and gently close the rear tailgate on the wires.

Bret B.


Yes I am still completely satisfied with both the hitch and wiring harness.


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.

Honda Pilot

I wrote about the wiring harness in my review of the hitch installation. Many talked about how difficult it was. I followed the directions for my Honda Pilot and found it very quick and easy. It stows in the compartment with the head rests and I pull it out when I need to hook it up. Pretty simple. If only it could be accessible right at the receiver without hanging out the rear hatch it would look a lot better. Picky, picky, picky. But, that's why I gave it a 4 out of 5. The etrailer staff were extremely helpful and quick to respond with precise info. Thanks folks.

Joe B.


Everything is still working as expected.Thank you for being there.

1999 Honda Odyssey

Had weird acting trailer lights for quite awhile. When I checked voltages at the vehicle I noticed low voltages for one of the TS. I suspected the 4 way adapter that was installed in 1999 Odyssey. I purchased this one from eTrailer, hooked it into the van and it fixed the issues. The trailer lights are now rock solid. I guess the TS converter on the old one had an issue. All is well now.

Bill G.


Still working great, no issues :

Show More Reviews

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

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 2003 Honda Pilot Trailer Wiring Recommendation
    For your 2003 Honda Pilot the Tow Ready trailer wiring harness part # 118336 is a confirmed fit and would work well. All of the connections are there on your vehicle as well. I attached an install video for more information for you to check out as well.
    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...
  • 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...
  • Do All 2003 Honda Pilot Models Have Connector in Cargo Area for Plug and Play Trailer Connector
    According to my contact at Tow Ready, all 2003-2008 Honda Pilots had the connector for installing the # 118336 trailer wiring harness. The connector is located under the threshold in the rear cargo area, as shown in the photo I've provided and the video I've linked for you.
    view full answer...
    Image 1 for
  • 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...
  • Why Does Trailer Wiring for 2004 Honda Pilot Route Through Back Door
    Having the 4-way run out of the back hatch is actually the preferred method although it seems like it wouldn't be. Having the 4-way stored inside the cab of the vehicle keeps it protected from rain and moisture to prevent corrosion and keeps it protected from damage to the wiring or connector by rocks or debris that might be on the highway. You can run the wire through the vehicle if you wish but just keep in mind that this does take more time and you may end up needing additional wire...
    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...
  • 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...
  • 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...
  • 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...
  • Trailer Wiring Harness Fit Recommendation for 2005 Honda CR-V
    For trailer wiring confirmed to fit your 2005 Honda CR-V you would want the Tekonsha kit part # 118336 which is a confirmed fit. It comes with a converter box and installs very easily by plugging right into a factory port at the rear of your vehicle. I attached an install video for this kit on a similar 2005 Honda CR-V as well.
    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 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...
  • 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...
  • Recommended Trailer Wiring for 2007 Honda Pilot
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118336 is a confirmed fit for your vehicle. I looked at your owners manual online and there is not a separate fuse for this wiring. This harness only draws 4 amps per circuit on the tail lights and only up to 2.1 amps for the stop/turn lights so you shouldn't have any issues.
    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
  • Will Custom Wiring Harness for Ford Escape part 118343 Convert the Separate Turn and Brake Lights
    Yes, it will. The custom wiring harness for the Ford Escape does convert the vehicle 3-wire system (separate turn signal and brake light bulbs) to the trailer 2-wire system (same turn signal and brake light bulb). When you hit the brakes on the Escape the brake lights will light up on the trailer. If you have a turn signal on at the same time you are braking the corresponding turn signal/red light on the trailer will flash while the other side is solid red for the brake light.
    view full answer...
  • Replacement Trailer Wiring Harness Recommendation for 2005 Honda Pilot with Shorted Out Wiring
    Sounds like a short took out your trailer wiring harness and it is in need of being replaced. For that you would want the part # 118336 which is a confirmed fit for your 2005 Honda Pilot. You will want to find where the short is on your trailer and fix as necessary. Look for any cut or frayed wire and fix as needed.
    view full answer...

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

Info for this part was:

Employee Jackie C
Expert Research:
Jackie C
Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Reno H
Expert Research:
Reno H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Zack K
Video Edited:
Zack K
Employee Andrew K
Video Edited:
Andrew K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew L
Video Edited:
Andrew L
Employee Nicholas E
Test Fit:
Nicholas E
Employee Shane T
Test Fit:
Shane T
Employee Adele M
Updated by:
Adele M
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Cole B
Installed by:
Cole B

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924