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  1. Custom Fit Vehicle Wiring
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  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 # 118424
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Custom Fit Vehicle Wiring

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Custom Fit Vehicle Wiring 118424 - 4 Flat - 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. Powered ModuLite reduces strain on wiring system. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118424 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 (116)
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Tekonsha Custom Fit Vehicle Wiring - 118424

  • 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 - 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


  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 4.2 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side interior trim panel in your rear cargo area.

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

118424 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118424 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 - 118424

Average Customer Rating:  4.8 out of 5 stars   (116 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.


Installation was very easy and everything just worked! My only wish is that the ground wire were a little longer. I attached the ground wire to the suggested, existing screw but it's not quite long enough for the box to be completely tucked to the side; instead it's under the storage area and you can see and feel where it pushes up. If it had been just two or three inches longer, it would've tucked cleanly to the side of the storage area. I also could've attached it to a different grounding point but I didn't see any other options and I didn't feel like trying to tap into the body metal.


Super quick and easy installation. Looking at the customer installation photos online at etrailer was very beneficial. The only reason I don't give this wiring harness 5 stars is because the ground wire could have been a few inches longer to make for the best installation.

2009 Acura MDX

Installation in our 2009 MDX was a snap! The unit plugs directly into the terminal panel near the left rear corner of the cargo area, and there's plenty of room in the space below the cargo floor to mount the controller unit (I used 3M double-stick foam mounting tape if my own, as the pieces referenced in the instructions were not included). As other reviewers have noted, the white ground wire is too shot to reach the main grounding lug where grounds for everything else in the area connect to, but I found a 6mm (?) threaded boss under the surface pad just to the left of the opening for the jack, which worked perfectly for securing the ground wire. I ran the flat-4 connector thru a small slit I cut in the wide rubber grommet under the plastic shield in the jack compartment (where the OEM harness runs thru - be careful not to nick any if those wires when cutting!) and then zip tied it along the top of the hitch tube down to the bracket for the connector (be careful not to let the wiring hang down and contact the heat shield though). I re-sealed the penetration thru the slit in the grommet (interior and exterior sides) using some black silicon RTV gasket maker I had on hand, but any other silicon product would prob work as well.

The whole installation was a total cakewalk, and the end result looks very professional if I do say so myself! I did chuck the cheesy mounting screws that came with the connector mounting bracket though, and used some 6mm SS machine screws w/SS lock washers and nuts that I had on hand. Had to drill out the mounting holes in the bracket but it was no issue. Sprayed it black afterwards to match all else.

A year later now and the harness and connector are still rock solid and still looks like factory-imstalled. Excellent product, def would buy again andor recommend to friends. But not enemies.
Sean H - 05/19/2020

2011 Acura MDX

This was probably one of the best products I’ve purchased in a while in terms of all around quality, value and simplicity. Instructions are crystal clear, completely comprehensive and with actual quality photos. It leaves nothing to question. Highly recommend!

2007 Acura MDX

Product arrived on time and in perfect condition! Very EASY to install and I owe it all to watching the videos provided on the site. I had my cell phone in and under the car and watched step by step on how to install both the hitch and wiring harness. Hardest part was holding up the hitch...had to ask my wife to climb under the car with me for the extra hand! Not that its hard just awkward angles to wrench and hold at the same time. I've seen some reviews that others used a floor jack if an extra hand isn't available which I think is a great idea!


This product is as described and performs as it should. Works excellent and looks great! I was able to install the kit in two hours, in my driveway. Customer service was exceptional as well. Thank you etrailer and Justin.

2007 Acura MDX

Fit well on 2007 mdx and used 5 times So far.


great job thanx


Installation was very easy with the instructions provided; the only tool I needed was a 10mm wrench and it took about 30 minutes. The video provided on the site was also very helpful. The ground wire could have been a bit longer to make it easier to put the floor liner back down without a bump, but overall I'm very happy with the connector kit.

2011 Acura MDX

Very easy to install and is looks like stock on my Acura MDX love it.

2015 Acura MDX

Let's see, $40 on this wiring harness or $200+ to get it wired from factory? Financially, it made sense so I decided to try it out. The wiring was super easy and the instructions were perfect! I wired mine a bit differently so it actually goes down through the bottom of the floor panel and I zip tied it to the actual hitch so it is almost like a permanent mount. The wiring itself only took about 15 minutes. This is a great alternative to factory wiring. I used this on a 2007 acura mdx.

2018 Acura MDX

I installed the hitch on my 2013 Acura MDX the day after I received it. The video instructions on the "etrailer" website were a great help and the installation was made following the tips and suggestions included in the videos and reviews. I installed it by myself and used a bottle jack (with a block of wood) to position the hitch for mounting. I did not raise the vehicle and installed the hitch with the vehicle's tires on the ground. From start to finish, the installation time was about 2 hours (including borrowing 1/2" drive 18 mm and 22 mm sockets from a neighbor to tighten the mounting bolts). The installed hitch is unobtrusive, doesn't impact ground clearance, and looks like a "factory" installation. The product arrived when promised and was in excellent condition as delivered.

2007 Acura MDX

Pros: Plug & Play. 4-way lead is plenty long.

Cons: The grounding wire is too short. Did not come with double sided tape as the instructions say it should have.

For a factory looking install, the white grounding wire is too short for a 2007 Acura MDX. I removed the felt cargo tray in the back of my MDX and removed two circular rubber grommets from the sheet metal below, which allowed me to route the 4-way electrical connector out of the bottom of the car (near the spare tire) and permanently mount the trailer connector to a bracket on the hitch. I like this setup better than the instructions which say to store the 4-way lead in the cargo tray and just run it out the hatchback door when towing. The trouble is, if you want to put the ModuLite power module out of sight (aka behind/within the interior trim), the grounding wire is too short (even per the installation instructions). With the ground connected and the length of grounding wire they give you, the module would end up under the felt cargo tray after the tray is re-installed, and there's no space for it. The tray would bulge very awkwardly. I solved it by splicing in 6 additional inches of 12-14 gauge wire on the grounding line and then tucking the module into a very convenient cavity under the MDX's electric junction box on the drivers side of the car. Also, instruction step 3 says that the harness should include some double sided tape to mount the module (basically to keep it from rattling); mine didn't come with any tape.

So, for needing to splice in 6 inches of grounding wire and for having to provide my own double-sided tape, I deducted one star. Other than that, install was pretty easy.

2012 Acura MDX

Hitch looks perfect....close to factory installed. Lines up perfectly and almost level with the exhaust. I purchased the wire harness and the mounting bracket for the 4 pole flat trailer connection. Looks great and pleased with the price/shipping.


For years we have talked of exploring the US in a motor home. Class A homes are too large for us and are difficult to drive in urban settings. We decided to rent a small trailer pulled by our Acura MDX. We didn't have the slightest idea about what gear we would need to prepare our vehicle for towing. Thanks to Paula at etrailer, we were given the time to describe our plans, vehicle and the trailer we planned to rent. Paula walked us through the towing accessories needed, and made her recommendations. We followed her advice, ordered the parts and Paula stayed late before the weekend to ensure our order was shipped before she left for the day. The parts arrived in 2 days and have been installed on our vehicle with no problems. We are very pleased with and Paula

2013 Acura MDX

I was going to have the dealership install a Trailer hitch and wiring harness on my 2013 MDX but decided to do it my self with the help of etrailer. Very quick shipping, very easy install, just as advertised. I watched the video's on the website the night before, they made the install a breeze. I saved over $600 !!! Thanks etrailer!!!


Excellent hitch that was represented accurately in the online descriptions as well as through the agent I spoke with. Fits perfectly, installed in 90 minutes, and the wiring harness was universal for easy plug-and-go on my vehicle's existing wiring. Best part is that it was a great price for great quality!


Called to get info on installing trailer wiring. Geoffrey was super helpful. I also got the hitch and ball and a the led tester for the lights. It all arrived in a few days and was easy as pie to install. Even included the self-tapping screw. My Acura dealer quoted me $450 for this job, even after I sent them the info on the kit and a video showing how easy it is to install.


Product arrived on time but not in a perfect condition. UPS delivered it with paint chips in 3 places. Installation was as advertised. It took me approx 45 minutes to install without lifting the vehicle and doing all this alone. Installation of wiring harness took less than 5 minutes. I used the product almost immediately and it worked great. Overall happy with the product and the ease of the installation.


The ground wire on this product is not long enough to reach from the suggested ground point to the side trim area, where you need to mount the black box. If you mount the black box on the floor of the cargo area, the cargo area liner would not fit back in properly.

I had to use an alternate ground point, which I found way back underneath the side trim. Worked fine, just not as easy to access.


Very easy to install on my Acura MDX, one year later, no complaints. Great price, too!

2015 Acura MDX

Installed it in less than 15 minutes, hooked it up to the trailer and it works great. The dealer wanted to charge me close to a thousand dollars to wire my MDX.

Still going strong after one year. No issues at all.
Mike - 11/21/2014


This is a replacement item that I purchased a few years ago that for some unknown reason went on the fritz. Current getting to the controller but not going thru to the wiring for the trailer. Impossible to take apart to see if fixable so bought a new one. This one works, at least so far. Use the trailer twice a year but think working lights are a good idea. Installation is much easier the second time, not very difficult the first time either. Great service in gettng me the part on

2012 Acura MDX

The product can be installed as indicated in the videos; however, the 2012 MDX Advance has an additional equipment installed below the electrical connection box that makes it much harder to thread the electrical connector up to the electrical box. It can be done, but is more difficult than indicated. I suggest updating the video or providing a second video showing the advanced version.

2011 Acura MDX

Very easy installation. I have the Advanced Package and even with the extra box, wiring around to the plug was a breeze. This took me less than 10 minutes. I did not mount this to the exterior of the vehicle.

Show More Reviews

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

  • Trailer Wiring Harness Shows No Power On 2010 Acura MDX
    When installing the Tow Ready Wiring Harness, part # 118424, and you find that you have no power to the wiring harness you probably need the relay as stated on our site under Tech tips. You will need to visit your Acura dealership to have the relay installed. They would be able to advise you concerning the best location for installation. One of our folks here said that most Acuras have the relay installed but on occasion it has not been there and requires the dealer to take care of it.
    view full answer...
  • Is a Relay Required to Activate Trailer Wiring Harness # 118424 on a 2010 Acura MDX
    Tow Ready trailer wiring harness # 118424 is a fit for your 2010 Acura MDX. You will need to make sure that the white ground wire is attached to a clean and corrosion free bare metal surface. A weak ground connection could be the cause of the problem. It is also possible that you will need a relay. Most of the vehicles that use this harness have the relay but if yours is missing the harness will not be fully functional. You can check to see if yours is present by finding its location using...
    view full answer...
  • 2011 Acura MDX Trailer Wiring Harness Recommendation that Does Not Require any Relays
    For trailer wiring for your 2011 Acura MDX we have the Draw Tite harness part # 118424 which does not require any special relays from Acura. It comes with everything needed to install and would work well for you. I attached an install video for this harness on a 2011 MDX just like yours. The Curt harness wouldn't require the relay either, but since we have better luck with the Tow Ready harnesses I recommend them more.
    view full answer...
  • Do I Need to Add Fuses to my 2007 Acura MDX When I Install a Trailer Wire Harness, Part # 118424
    When you are installing a T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, part # 118424, you will not need to install any fuses into your 2007 Acura MDX. I have included instructions and an installation video linked below.
    view full answer...
  • 2007 Acura Mdx Trailer Light Relay Location
    For your 2007 Acura MDX, when installing a wiring harness like the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118424 a trailer relay from the manufacturer may be needed. Once obtained the trailer relay location is under the rear fuse panel in the cargo area on the drivers side. It will be below and slightly to the rear of that fuse box access. You will also want to make sure your trailer fuse is good under the hood of your vehicle.
    view full answer...
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  • Where Does the 4-Way of a 2012 Acura MDX Store When Not in Use
    In most situations it is preferred to have a 4-way connector on a vehicle that stores on the inside of the vehicle as that will protect it from potential damage and from developing corrosion. The wiring harness part # 118424 is designed to store on the inside of your 2012 Acura MDX and then when you need it you would be able to open the rear door and pull the harness out so that you can attach it to your trailer. The only way you would be able to store it outside would be run it out the...
    view full answer...
  • Trailer Lights Work then Shut Off Using Wiring Harness 118424 on a 2012 Acura MDX
    You should not require additional fuses or relays to install the trailer wiring harness # 118424 unless those items are missing on your 2012 Acura MDX. In some cases, there is a relay needed that can only be obtained at an Acura dealer. Consult the vehicle owners manual for the locations of any fuses or relays related to the trailer wiring to check them. The fact that it worked at first then stopped tells me that it could still be a ground issue. You can try moving the converter ground...
    view full answer...
  • Locating Reverse Light Wire to Install 4-Way to 5-Way Adapter on 2010 Acura MDX
    It looks like the reverse lights themselves are on the hatch of your 2010 Acura MDX. You should be able to access a reverse light wire either directly behind one of the lights provided there is a way to access the backs of the assemblies. You will likely have to remove a panel to do so. The other option is to locate where the wiring exits the hatch to go into the vehicle. It is likely at the top of the hatch. You would have to cut away the sheathing to the wires and use a circuit tester,...
    view full answer...
  • Installing Draw-Tite T-One Vehicle Wiring Harness On 2010 Acura MDX
    No other products are needed to install the # 118424 wiring harness. To help protect electrical connections, you can use a small amount of dielectric grease # 11755. The Draw-Tite T-One Vehicle Wiring Harness # 118424 plugs into your vehicle's wiring harness at the driver's-side interior trim panel in the rear cargo area. No cutting or splicing is needed to install the wiring harness. The white wire will need to be grounded. There is a grounding stud located at the back of the rear...
    view full answer...
  • Troubleshooting Brake Lights on Trailer Towed by 2008 Acura MDX
    I'd be happy to help you with that. You'll need a circuit tester like part # 40376. Check the pins that are fed by the green and yellow wire, there should be signal on those wires with the brake pedal pressed. If you don't see power on either of those wires with the brake pedal pressed, trace the 4 pole trailer connector until you reach the black converter box. Locate the red wire entering the converter box. Test the red wire, which SHOULD show power when the brake is pressed. If it does...
    view full answer...
  • Recommended Trailer Hitch and Wiring for 2012 Acura MDX
    Thanks so much for your repeat business! Starting with the trailer hitch itself, the Curt Class III Round Tube Receiver Hitch # 13354 that you referenced is confirmed to fit your 2012 Acura MDX and will work great. The hitch is custom-fit for the vehicle, so it will use existing holes in its frame for a no-drill installation. I have attached an installation video on your Acura that you can use for reference. Then for a custom-fit wiring harness, I recommend the Tekonsha T-One Vehicle...
    view full answer...
  • Trailer Hitch and Wiring for a 2009 Acura MDX with Full Size Spare Tire
    Curt trailer hitch # 13354 is listed as compatible with models of the 2009 Acura MDX that have the full size spare tire. I have included a link to a video showing an example installation for you. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin with clip, and a storage bag. If the ball...
    view full answer...
  • Trailer Wiring Harnesses for a 2012 Acura MDX
    Yes, we do have the Tow Ready trailer wiring harness, # 118424, listed as a fit for a 2012 Acura MDX. You can also use Curt wiring harness # C56038. I have included a link to the installation instructions and a video showing a typical installation of the Tow Ready harness for you.
    view full answer...
  • How To Connect a 5-Way Trailer Connector To a 4-Way Vehicle Connector on a 2007 Acura MDX
    You are correct, the 5th pin on the 5-pin connector is to provide the reverse lockout feature for surge brakes on the trailer. It will have to tap into the reverse light circuit of your vehicle to operate properly. We have a part that is designed just for that purpose. It is the Tow Ready 4 Pole to 5 Pole Wiring Adapter, part # 20036. This adapter will plug into the 4-Way connector on your 2007 Acura MDX and the extra blue wire would be spliced into the reverse light circuit on your vehicle....
    view full answer...
  • Mounting Bracket Recommendation for a 4-Way Trailer Wiring Harness on a 2011 Acura MDX
    To attach wiring harness # 118424 to the hitch you can use a different type of mounting bracket that does not require screwing into the plastic fascia. You can install the wiring harness like in the video I have linked and then use the 4-Flat Universal Mounting Bracket, # 118149 which will just zip tie to the hitch.
    view full answer...
  • Trailer Lights Not Functioning if 2013 Acura MDX Key is not in On Position or Running
    The Draw-Tite T-One Vehicle Wiring Harness with 4-pole flat trailer connector # 118424 plugs directly into the vehicle established wiring harness using the T-one style connection at the fuse box located in the cargo area at the rear of the vehicle. The issue that you are experiencing with the trailer lights not working when the vehicle ignition off or the key in the off position is attributed to the vehicle wiring. It is most likely a function of how the vehilce itself is wired, and does...
    view full answer...
  • Is Custom 4-Way Trailer Wiring Harness 118424 Better than Curt Wiring Harness 56038 for an Acura MDX
    Both the Tow Ready wiring # 118424 and Curt wiring # C56038 are correct fits for the Acura MDX, but the # 118424 is a confirmed fit for more model years. The # 118424 will fit 2007 through 2010 MDX models, while the # C56038 is only confirmed to fit 2007 through 2008 models. Both wiring harnesses plug in at the same factory port, as they are both custom fit for the vehicle, and both feature a powered converter to protect the MDX electrical system. I have included links to an installation...
    view full answer...
  • American-Made Trailer Hitch for 2012 Acura MDX
    I'd recommend the Curt Class III Trailer Hitch, part # 13354. Curt manufactures their hitches in the USA. Draw-Tite is an American owned company, but their hitches are manufactured in Mexico. If you'll be using the hitch for towing purposes, you'll need a few more parts to complete your towing system: Trailer wiring harness with 4 pole trailer connector, part # 118424 Ball mount, part # 2923 Trailer ball, part # 19261 for a 1-7/8 inch or # 63845 for a 2 inch.
    view full answer...
  • Trailer Hitch and Wiring for a 2009 Acura MDX
    Curt Trailer Hitch Receiver # 13354 does not come with a wiring harness; reason being that not everyone is using the hitch for towing so we make each component available separately. To add a 4-Way flat connector to your 2009 Acura MDX you can use # 118424. I have linked videos showing example installations of both the hitch and the wiring for you. I also recommend etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4...
    view full answer...
  • Will Hatch Still Open on 2011 Acura MDX When Using Thule Transporter Combi Cargo Carrier # TH665C
    The Thule Transporter Combi Hitch Mounted Enclosed Cargo Carrier, # TH665C, was designed to work with 1-1/4", Class II only, and 2" trailer hitch receivers. Since this carrier will only work with the Class II you will want to start by determining whether the hitch on your 2011 Acura MDX is a Class I or Class II. In order to prevent someone from overloading their Class I 1-1/4" hitch with an accessory, like the Combi, that was designed for a Class II 1-1/4" hitch, manufacturers place a...
    view full answer...
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  • How to Tap Into the Reverse Light Circuit of a 2007 Acura MDX for Installing a 5-Way
    If you open the liftgate of your 2007 Acura MDX you should see a black section of conduit that holds wires that will run from the threshold of the door to the door itself. In that bundle of wires should be a reverse light circuit. What you could do is remove the interior panel behind the threshold where the harness goes and test the wires to find which one is the reverse light circuit. You will need to use a circuit tester like our part # 40376. Aside from that you could try tapping into...
    view full answer...
  • Do the Curt and Hidden Hitches Available for 2008 Acura MDX Require Rear Bumper Trimming
    The Curt hitch # 13354 and the Draw-Tite part # 75614 do not require trimming of the rear bumper, but they do require the trimming of the heat shield. The recommended trailer wiring is part # 118424 and the recommended installation method is to have it come out of the rear hatch and have the door shut on the wires when needed. If you wanted to route it through a hole in the trunk floor board that may be possible, but we have never tested this method so we don't know for certain if that...
    view full answer...
  • Trailer Wiring and Anti-Rattle Device Recommendation for 2013 Acura MDX
    The best trailer wiring option we offer for your 2013 Acura MDX is the Tekonsha kit part # 118424 which is our most reliable option we carry. It will work well with the mounting bracket on the Draw Tite hitch part # 75614. You'll need to attach the mounting bracket # 18144 to that plate though to give the 4-way something feed through. The recommended anti rattle device for the Draw Tite hitches that have the part # 63232 which also doubles as a hitch lock.
    view full answer...
  • 7-Way and Brake Controller Recommendation for 2010 Acura MDX
    You will need to start with a 4-way (if you do not have one) on your 2010 Acura MDX to install a 7-way and brake controller. For that you would want the # 118424. From there you would need to convert the 4-way to a 7-way so that you can install the brake controller. For that you will want the Brake Controller Install Kit and 7-Way Adapter part # ETBC7. I attached installation instructions and an install video for this product as well. For a brake controller I would recommend the Prodigy...
    view full answer...

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