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 4-Pole Flat Trailer Connector

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

Item # 118438
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Custom Fit Vehicle Wiring

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118438 - 4 Flat 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. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118438 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
  • All Info
  • Reviews (436)
  • Q & A (72)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118438

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

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring 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 - no cutting or splicing of wires
    • Locate connection point in rear cargo area
    • Plug in connector
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 4.2 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 the passenger's-side interior trim panel in your rear cargo area. Once you've plugged in the connector, insert the included fuse into your fuse panel as indicated in the instructions.


Once installation is complete, the 4-way flat connector will be stowed in the jack storage compartment of your rear cargo area.


It is recommended that you use a small amount of grease on all electrical connections - the plug 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.



118438 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118438 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 - 118438

Average Customer Rating:  4.9 out of 5 stars   (436 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.

- 118438
by:

I left a detailed review for the Hidden Hitch with THIS product as part of the review because I bought it as a package deal. I will say a quick note on this product alone just for customers information. This was ridiculously easy to install. It literally just PLUGS IN to a control board, then you have to remove a small bolt and attack ground wire, zip tie the wires across to the jack compartment for easy storage when not in use and plug in a small fuse up front. I can honestly say that even someone that is not mechanically inclined or used to working on cars could EASILY install this wiring harness. A great product, great customer service. I give it 5 stars. Highly recommend this product and etrailer.com 86594


Comments
Havent used the wires in over a year after our move across the USA. Just towed a boat this late week and the wires all still worked perfect. Had no issues and they were in the same shape as when I first opened the box. High quality product, highly recommend.
Adam P - 01/05/2015

8381

- 118438
by:
2010 Honda Odyssey

Ordered a hitch for Honda Odyssey. Received it 2 days ago, installed yesterday - easily, with the help from a friend. Everything fit just right, no drilling. The electrical part was no problem. Today used it to tow my boat in for service. Etrailer was great. Minutes after I placed the order I received an email acknowledging the order and offering to call with any questions. An hour or so later, another email informed me that it has been shipped. Excellent job. Thanks! 58075


Comments
A year later, everything works fine. Highly recommended. Good product, fine company. Still 5 stars.
A. S - 04/24/2014

3731

- 118438
by:
2008 Honda Odyssey

I got tired of waiting to have my trailer lights wired by UHaul and decided to do it myself. With the kit from etrailer it turned out to be much easier and cheaper than I expected. Quick and courteous service, good online presence. Awesome job! 880749



- 118438
by: 09/10/2020

Trailer hitch and accessories have performed well. Everything was easy to install. 876890



- 118438
by:

Great, I was able to do it myself with the instructions and videos from etrailer easily. And I am no mechanic. 868199



- 118438
by:

Recommend this product, works great 1 year later. 848762



- 118438
by:
2009 Honda Odyssey

Trailer hitch and wiring harness installation were pretty straightforward with instructional videos. I recommend using an auto trim panel removal tool for the wiring harness installation, but a flat screwdriver will work as well. 831730



- 118438
by:

Works so well! Consistent and reliable. I'm a DIY guy and this was very simple to install, the instructions were great. Couldn't recommend more! 800995



- 118438
by:

Easy to order and fast shipping. Videos on site were very helpful in determining which items I needed. 791934



- 118438
by:

Thanks 785278



- 118438
by:

Fit perfectly and instructions were on point. 773063



- 118438
by:

Good product and easy to install. 771784



- 118438
by:

Works great. Pretty easy to install. Good directions. 766536



- 118438
by:
2009 Honda Odyssey

fast shipping. great trailer hitch for 2009 honda odyssey . easy install and very helpful video online to watch before install. i will recommend e trailer to anyone that need a quality trailer hitch at a great price . also ordere the plug and play wiring harness for the van also . 764602



- 118438
by:

Amazing Product, super easy to install and it works perfectly! Highly recommend. 730808



- 118438
by:

Good quality and extremely easy install ation. 726770



- 118438
by:
Honda Odyssey

Great product. Arrived quickly and plugged directly into existing wiring harness (2006 Honda Odyssey) so did not have to splice/solder any wires. I have not used with trailer yet but was able to verify that wiring worked with 4 wire trailer light tester. 720503



- 118438
by:

Fantastic product!! Easy to install, the kit was complete with everything necessary. The instructional video was top notch!!! Highly recommended!!! 719810



- 118438
by:

Website provided everything I needed - multiple hitch options, as well as wire harness options were presented. The instructional videos were well done, and made the installation of both the hitch and wire harness extremely easy. Hitch and harness both arrived on time, as promised. This is now the third hitch / wire harness we've ordered from etrailer - Thank you. 710908



- 118438
by:

Easy to install, works well, no issues, factory plug and play. Would like to see it come with a metal self-tapping screw, but it doesn't, so you'll need one of those. Installation was straightforward and simple. 697284



- 118438
by:
2008 Honda Odyssey

I have never regretted ordering through etrailer. As always, this order arrived precisely on-time. The wiring for trailer lights proceeded exactly as expected. The online video describing the installation was very helpful with no surprises encountered while following the instruction. Don't forget to order a hitch pin. Surprisingly, it wasn't included with the drawbar. 693278



- 118438
by:
2008 Honda Odyssey

I've used the wiring harness (and trailer hitch) several times since purchasing and installing it a year ago. It's been great. It's easy to use and installed unseen into my 2008 Honda Odyssey. Thanks so much! 682157



- 118438
by:

High Quality 667151



- 118438
by:

It fits perfectly fine. No issues to install. Just follow the instructions and should be fine. 665587



- 118438
by:
2009 Honda Odyssey

Fast shipping, easy to understand instructions, easy installation. 664614


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Show More Reviews

Ask the Experts about this Tekonsha Custom Fit Vehicle Wiring

  • How to Test Converter Box of Trailer Wiring Harness
    The first problem is you bought the harness from Amazon and not us...just kidding! What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # PTW2993 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box has shorted itself...
    view full answer...
  • Trailer Tail Lights Do Not Work/No Power On Brown Wire in Wiring Harness 118438 2005 Honda Odyssey
    You can test the wiring harness, # 118438, to determine if it is functioning properly. First, use a circuit tester, like # 40376 if needed, to test the wires going into the converter from the vehicle. If there is no signal for the running light circuit then the issue is on the vehicle. If the signals are correct going into the converter but incorrect coming out to the 4-Way then the converter is bad and it will need to be replaced. If you determine the issue is on the 2005 Honda Odyssey...
    view full answer...
  • Testing Converter Box of Tekonsha Trailer Wiring Kit part # 118438
    What you will want to do is test the wires going into the box of the converter box for voltage with a circuit tester like the # PTW2993 to see if there is voltage going into the box when the taillight functions of your vehicle are applied, and then test the output side of the box to see if the current is making it through the converter. If not then the problem is that the converter box has shorted itself out and would need to be replaced. Before you replace it you will want to inspect...
    view full answer...
  • Trailer Lights Not Working when Connected to 2008 Honda Odyssey
    Not all trailer wiring harnesses are created equal. By that I mean that if there is a weak ground on the trailer side it could work with some but not all vehicles. Also depending on how many lights the trailer has it is possible that it is overdrawing harness # 118438 on your 2008 Honda Odyssey. This particular harness is rated for 2.1 amps per circuit for brake and turn signal lights and 4.2 amps for the running lights. Also you will want to make sure that the wiring harness white ground...
    view full answer...
  • Troubleshooting Trailer Lights not Working After Harness Install
    There are a number of steps for you to take to figure out exactly why the lights on your trailer are not working. You did not specify the harness you used, but for a 2007 Honda Odyssey, there are three fits, the T-One # 118438, Curt # C56161, and Hopkins # HM11143115. To start, we'll isolate the problem to either the trailer or vehicle. You can do this by using a circuit tester such as # 40376 to check the functions of the 4-way plug while somebody else engages them (brake, turn signal,...
    view full answer...
  • Running Lights Are Not Working On a Trailer Towed by a 2008 Honda Odyssey
    The typical cause of trailer running lights not working is a bad ground connection but there are some tests you can do to determine where the problem is. First, disconnect the trailer from the tow vehicle. Then use a circuit tester such as # 40376 if you need one to test the connector on the vehicle. Have someone sit in the vehicle and turn on the running lights while you test the connector with the circuit tester. If the running light circuit works at the trailer connector then the...
    view full answer...
  • Where Does the Fuse Install From Tow Ready T-One Wiring Harness # 118438 on 2005 Honda Odyssey
    Sounds like you are looking at position #5 on the drivers side fuse box of your 2005 Honda Odyssey Touring. When installing the Tow Ready T-One Wiring Harness, part # 118438, on your Odyssey you will want to locate the fuse compartment on the passenger side kick panel, near the glove box. Open the fuse compartment and place the provided 7.5 amp fuse into fuse position #5 in the fuse box. Attach the fuse label to fuse cover in position #5. I am including a link to the installation...
    view full answer...
  • 2003 Honda Odyssey EX Trailer Wiring Recommendation
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118438 is not a fit for your 2003 Honda Odyssey. Instead you will want the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118336. This will connect to factory wiring behind the trim panel in the cargo area on the driver's side. A tail light converter is built into this harness so you will have proper trailer function and will not affect the tail lights on your Odyssey. I've attached an...
    view full answer...
  • Installing the Fuse From T-One Harness Part # 118438 on a 2008 Honda Odyssey EX
    The fuse compartment can be found on the passenger side kick panel, near the glove box. Open fuse compartment and place the 7.5 amp fuse into the position #5. Attach the fuse label to fuse cover in position #5. The instructions are also accessible on our web site at the link below.
    view full answer...
  • Can the 4-Way Trailer Wiring Harness be Routed Permanently to the Outside of a 2007 Honda Odyssey
    What you can do on your 2007 Honda Odyssey is try to find a grommet at the bottom most part of the cargo area in the back. You will most likely have to remove trim panels and flooring to get to the bare metal of the storage area. The bottom of the jack storage compartment or the spare tire well are good places to look for a grommet. If there is a grommet then you can cut a slit in it and run the 4-Way end through (though you may have to cut the 4-Way end wiring in half and splice it...
    view full answer...
  • Troubleshooting T-One 4-Pole Harness 118438 Installation in 2006 Honda Odyssey
    Tekonsha 4-pole trailer wiring harness # 118438 is a correct fit for your 2006 Honda Odyssey and I am sorry you're having an issue with its operation. For reference, I linked the instructions and an installation video showing this item installed in a 2006 Odyssey like yours. Since none of your trailer lights function I suspect either a bad ground connection or that the included fuse is bad or is not installed all the way in the receptacle or is in the wrong receptacle. Please refer to...
    view full answer...
  • Wiring Solution For Trailer That Has Increased Amperage Draw and Blowing Fuses w/ 2005 Honda Odyssey
    What you will need to do is upgrade the wiring for the trailer connector on your 2005 Honda Odyssey. You are drawing more amps than the capacity of the Tow Ready Custom Fit Vehicle Wiring # 118438. You will need to upgrade to the Tow Ready Heavy Duty Modulite, part # 119190KIT, which has a capacity of 15.9 amps. This wiring kit draws power directly from the vehicle battery via included fuse. The reason there is a warning not to upgrade the fuse is because your wiring will not be able...
    view full answer...
  • 4-Pole Trailer Connector for 2010 Honda Odyssey
    The Tow Ready # 118438 would indeed be the correct 4-pole trailer wiring harness for your 2010 Honda Odyssey. If you click the provided video, you can see the full installation of the wiring harness on a 2010 Odyssey. I've also linked you to the instructions for the wiring harness. I've also linked you to a listing of the other vehicle specific accessories and equipment offered for your Odyssey.
    view full answer...
  • Tekonsha 4-Pole Trailer Wiring Harness for 2004 Honda Odyssey
    The correct Tekonsha trailer wiring harness for your 2004 Honda Odyssey is part # 118336. To assist you I linked an installation video showing your same model year Odyssey. The part you have # 118438 fits 2005 through 2010 model years of the Odyssey.
    view full answer...
  • Troubleshooting Trailer Lights that Come on as Soon as Connecting 2006 Honda Odyssey to Trailer
    Most likely there is a short somewhere that is causing the trailer lights to come on as soon as you connect the harness on your 2006 Honda Odyssey to the trailer. A short will cause constant power draw and will explain why this is happening. I recommend checking both the vehicle and trailer side connectors for any debris, corrosion or damage. You will also want to check the wiring from front to back and look for any frayed, pinched or damaged wire that may be causing the short and repair...
    view full answer...
  • Right/Stop Function Stays on After Installing the Tekonsha T-One # 118438 on a 2007 Honda Odyssey
    If you installed the Tekonsha T-One # 118438 correctly on your 2007 Honda Odyssey (see attached video) then the right turn/stop function on your trailer should not always be on. There are a few things that could be causing this issue; there is an insufficient ground on the trailer or vehicle, or the harness has been overloaded. If you had a powered converted with a lead running to the battery then you could remove the fuse from the power line to reset it, but you do not have a powered...
    view full answer...
  • Trailer Wiring Recommendation for a 2005 Honda Odyssey
    For trailer wiring for your 2005 Honda Odyssey you would need the Tow Ready Harness part # 118438 as it has been confirmed as a fit for your 2005 Honda Odyssey. I attached an install video for you to check out as well. This harness does have a converter box to take the taillight signals of your vehicle and convert them into standard 4-way trailer wiring. But the unit itself basically just plugs right into your vehicle for a very easy install.
    view full answer...
  • Trailer Wiring Recommendation for a 2005 Honda Odyssey
    Yes, the Tow Ready Trailer Wiring Kit part # 118438 is a confirmed fit for your 2005 Honda Odyssey and it comes with everything you would need to install the kit on your vehicle and provide you with a 4-way. I attached an install video for this kit for you to check out as well.
    view full answer...
  • Trailer Wiring Recommendation for a 2012 Honda Odyssey
    For your 2012 Honda Odyssey I have a solution for you, but the part # 118438 is not confirmed as a fit as it stopped fitting the Honda Odyssey after 2010. Instead for trailer wiring you would need the part # 118521.
    view full answer...
  • Towing Package for a 2008 Honda Odyssey
    The trailer hitch I recommend for your 2008 Honda Odyssey is the Draw-Tite Max-Frame # 75270 because it doesn't require any fascia trimming (like the etrailer and Curt might). This, as well as the other trailer hitches, exceeds the weight ratings of your Odyssey so you can be confident that you are getting the most out of the trailer hitch. Be sure to check the weight ratings of your Odyssey in your owner's manual and keep from exceeding it. To finish out your towing setup I recommend...
    view full answer...
  • Determining Correct Ball Mount for 2007 Honda Odyssey to Tow Pop Up Camper
    The way to determine the correct amount of rise (or drop) needed to tow a trailer level there are a couple of measurements needed. First you would measure from the ground up to the top of the receiver opening on the trailer hitch. Then, with the trailer level, measure from the ground to the bottom of the coupler. If the trailer is higher the difference is the amount of rise you will need. And if the vehicle is higher the difference is the amount of drop you would need. On the 2007 Honda...
    view full answer...
  • Trailer Wiring Harness for 2006 Honda Odyssey
    From the looks of the photo you sent in, you may have the wrong trailer wiring harness for your 2006 Honda Odyssey. I was unable to find your order number, but the wiring harnesses that fit an '06 Odyssey do not have the extra plug/cap like you are showing. That said, from the photo it looks like that is just a cap for the plug, but that would be unusual because there's really no reason to have a cap on the T-connector like that. The wiring harnesses that fit your 2006 Honda Odyssey...
    view full answer...
  • Parts Needed to Install a 7-Way Trailer Connector on a 2007 Honda Odyssey
    I installed a trailer hitch and trailer wiring on my mother-in-laws 2007 Honda Odyssey and I can tell you that unfortunately there are no plug-in 7-way wiring harnesses. To install a 7-way connector on your Odyssey, I recommend first installing a 4-way harness like the Tow Ready T-One Wiring Harness, # 118438. This is a plug-in harness that does not require cutting or splicing. I have attached the installation instruction and an installation video on a 2007 Honda Odyssey for you to check...
    view full answer...
  • What Size Bolts Used With Draw-Tite Class III # 75270 Trailer Hitch on 2009 Honda Odyssey
    The Draw-Tite Class III hitch you referred to, part # 75270 uses Class 8.8 M12x35mm bolts with a 1.25 thread pitch. The bolts would fasten to the weld nuts that are welded to the inside of the frame members. When you install the hitch, take some time to remove any dirt, grime and road boogers from the threads of the weld nuts. I'll link you to an install video. If you'll be towing with your hitch, you might also need the following to complete your towing system: Trailer wiring...
    view full answer...
  • Trailer Hitch and Wiring for 2010 Honda Odyssey for Bikes and Light Duty Towing
    The amount of bolts used to install any given hitch will always be appropriate for the capacity that hitch is rated for. So with that said going with an aftermarket hitch will be just as safe as the OEM hitch. The difference is an aftermarket hitch is going to cost less. Based on the amount of people in your family and the things you want to do with the hitch I recommend going with a Class III hitch with a 2 inch receiver. The most popular option is # 75270. I have linked a video showing...
    view full answer...
  • Trailer Hitch Recommendation for a 2008 Honda Odyssey
    Because of the mounting locations present on a 2008 Honda Odyssey and the fact that all of the available hitches have cross tubing that is straight across, all of the hitches will be visible on the van. You can look at the pictures on the product pages for the hitches to get a good idea of what they will look like on your van. I have included a link to all the hitches for you to view. I recommend going with a class III trailer hitch because they have a higher capacity and are compatible...
    view full answer...
  • Complete Tow Package Recommendation for 2008 Honda Odyssey
    Lets start with a hitch for your 2008 Honda Odyssey. For that the best option is the Draw Tite part # 75270 which is a confirmed fit and has plenty of towing capacity. I attached an install video for this for you to check out as well. For wiring you'd need to start with a 4-way like the # 118438 and then convert it to a 7-way with the # ETBC7 which comes with everything needed to wire in a brake controller as well. Install videos for these two products attached to this page as well. For...
    view full answer...
  • Are the Spacer Blocks Required to Install a Trailer Hitch on a 2009 Honda Odyssey
    The installation instructions for trailer hitch # 75270 do indicate that you will install the spacer blocks on all models this hitch fits so you will use them on your 2009 Honda Odyssey even though the video for the 2010 does not clearly show it. I have included a link to the installation instructions for you to view. If you plan on doing some towing I recommend the etrailer ball mount kit # EBMK4. It comes with a ball mount, interchangeable ball set, a hitch pin with clip, and a storage...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Patrick B
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
Adam R
Video Edited:
Zack K
Video Edited:
Joshua S
Video Edited:
Patrick B
Video Edited:
Chris R
Test Fit:
Nicholas E
Video by:
Kathleen M
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
Installed by:
Cole B

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