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  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 # 118628
Our Price: $55.30
You Save: 31%
Custom Fit Vehicle Wiring

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118628 - Custom Fit Tekonsha Custom Fit Vehicle Wiring
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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118628 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.
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Tekonsha Custom Fit Vehicle Wiring - 118628

  • 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
  • 3 Mini fuses included
    • (1) 7.5 Amp fuse
    • (1) 10 Amp fuse
    • (1) 15 Amp fuse in fuse holder


  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's junction box, which is located in your rear cargo area, behind the driver's-side trim panel in the spare tire compartment. You will need to remove any cargo nets and the cargo floor hatch your paneling to access this harness. Once you've plugged in the connector, insert the provided fuse into the vehicle's junction box.

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

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.

118628 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118628 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 - 118628

Average Customer Rating:  4.9 out of 5 stars   (138 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.

2020 Acura MDX

Just as advertised, easy install and a great overall product, saved me a lot of time trying to figure out what wires to splice and or tap into. Thank you Etrailer for that hook up and great YouTube video that made me buy this product.

2020 Acura MDX

My wife and I installed the hitch and wiring today which went kinda smooth. The brackets holding the tail pipes gave me a fit but we had success. Thanks and as always the hitch fit and looks great.

2018 Acura MDX

Instructional video online from etrailer was very good. It had more information than the instructions that came with the Tekonsha wiring harness, it was missing hooking up the ground wire. 2018 Acura MDX SH-AWD. I do not tow a trailer very often with this vehicle so I am leaving the pig tail inside and will run it out the rear door when needed.

2015 Acura MDX

I bough a used 2014 Acura MDX that had a receiver hitch the prior owner used to mount a bike rack. I wanted to be able to tow a boat and uhaul trailers, so a hook up for lights was needed. I have hooked up many trailor lights on trailers and autos over the years, this was hands down my best experience. the kit I recieved had really concise directions, all the hardware I needed for connections and I was able to complete the installation in about 15 minutes time. The only difficulty with the installation is my fat fingers dropped that tiny fuse and I couldn't find it. After picking up a replacement it was fine. A year later it still works great. thanks for taking all the thinking out of the chore.

2014 Acura MDX

Excellent wiring harness. Fit perfectly! After watching the installation video, it took me less than 10 min to install the harness. Thank you etrailer! Another great product!

2020 Acura MDX

I have ordered numerous items from etrailer thru the years. Product descriptions on their website are accurate and pricing is always the lowest. Shipping is always very fast. The customer reviews and installation videos are the best.


Great quality. Bought one on Amazon that came with a cut wire. Returned that and ordered this and I’m so glad I did.


Delivery on time with the correct harness and hitch
You may want to check threads in car frame as
I had to tap for bolts to thread. Otherwise
Installation was a breeze.
Only used once but good results so far!.
Pulling boat and utility trailers.



I have had no problems, all is well!

2014 Acura MDX

I recently installed a hitch on our 2014 MDX. It fit like a glove and looks great. I was very impressed with the installation videos and the great service by Pat who assisted me with my order and followed up afterwards!

I would highly recommend Etrailer!



Still very pleased... I never think about it, which means no troubles, no worries! Thank you!

2016 Acura MDX

receiver hitch and wiring harness for 2016 Acura MDX, easy to install, good instructions, works as advertised!

Steve L.


just fine! no problems

Acura MDX

Ordered Drawtite hitch & wiring for ma newly acquired MDX. Info was exellent showing me what I needed & how to install. Ordered on Tuesday afternoon & delivery was the following Thursday! Outstanding.

Jerry F.


Product and contact personnel were perfect and after a year still works perfectly. Will be ordering another one as soon as I can talk my daughter into it for her new car.

2010 Acura MDX

I received the etrailer hitch about the same as many others - that is, the box had a hole torn in it, but there was no damage to the product. (I'm not sure how this product could be shipped without tearing the box unless the box was double or triple thickness.) I watched the videos a couple times and then set out to install the hitch. I am 69 years old and was doing this alone on my garage floor with the MDX on the garage floor - not jacked up. It would be MUCH easier if you had two people and had the vehicle in the air on a lift to get to things easier. 2 people would make it a 20-30 minute install, however, it took me 1 hour to install the hitch. Used a small floor jack to raise the hitch and two jack stands to hold it in place while I got the bolts started. I didn't have a torque wrench that goes to 139 lbs, but a neighbor did, so solved that issue. The Tekonsha wiring harness was also an easy - 10 minute or less install. Very happy with the products and would recommend to anyone. Hitch fits great and looks good. Now, I just need to buy that utility trailer so I can use the hitch.


Everything was as described. Great products!

I installed my hitch myself. The video was great.

For me, It was a tedious balancing act with my floor jack. Recommend placing some sort of hanger that allows one side of hitch to be “hung” from the frame allowing the ability to bolt up the other side using a jack to move into place.


The best kit for installing a factory compatible tow hitch.

2010 Acura MDX

Wiring harness shipped was very useful, easy to install; although the advantage is on the vehicle OEM because our MDX was pre-wired and required simple plug-in.
One minor point, the kit came with a 7.5 amp and a 10 amp fuse, but the fuse box on the car map for the trailer reverse and stoplights required a 10 and 20. I was able to use the 10, but had to get my own 20 amp.


I bought the trailer hitch for a bike rack and the hitch silencer to stop the rattle of my
rack. I added the wiring harness mainly because it was so simple to install and I might need it in the future. In a nut shell, you had every thing I needed at a fair price and excellent quality. My order was shipped and delivered quickly. The videos on you website are the really the icing on the cake. This was not my first purchase from
etrailer and I will always look at your website first when I need something for my vehicles.

2014 Honda Pilot

We purchased a hitch and wiring harness for a new Acura MDX. We had also purchased the same for our Honda Pilot. I came directly back to etrailer when we purchased the new Acura and they were so easy to purchase from and with the fast free shipping you can not go wrong. The hitch was as easy to put on as advertised. Thank you for a great experience! We will be back!!

2016 Acura MDX

Excellent equipment and service. Ordered the custom hitch for our 2016 MDX (same frame and connections as 2014-2015 MDX). Easy to install thanks to the instructional videos, less than 30 minutes. Quality is superb and works great. Will be able to tale our bicycles with us on vacations and use cargo trailers. The connections for wiring was also very simple and exactly as shown in the video. Had a hitch for our new MDX with wiring for less than $300, a dealer option would have cost over $800.

Customer service is superb. Had to modify order to include a bracket. Ana held my order and added the bracket and send my order same day.

This is our third hitch from (had one for our previous honda odessey and for Acura RL) and are very satisfied.


Super impressed with the service and timeliness of your organization. Found y’all randomly on google and you are super legit. Helpful website, helpful recs, customer reviews. Customer service great too. Forgot part of my order and it was overnighted, arrived on time. Everything on point. Keep it up.


We have a 2020 Acura MDX Tech AWD and on our model we did not need the 10 amp fuse no spot for it but other than that the instruction were clear and easy. Maybe took us 10 minutes. We also installed trailer hitch took no more than 30 minutes the hardest part was getting it over rubber grommets. When I use the term “us/we” I supervised my husband may have taken less time without my supervision.

2016 Acura MDX

The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector is the easiest harness I have ever used. In all fairness, the Acura MDX with it's pre-wired connector and separate fusebox simply make the job that much easier. The harness from E-trailer is really good quailty. I honestly completed the job is less than 5 minutes!

The instructions were OK, but I also utilized their videos to get a little better insight on the job. The E-trailer website and ordering process was a breeze and the package even arrived a day early. Would have ordered from [site] but they are beginning to get so many knock offs, I decided to go with e-trailer so I would get the "real" thing.

2016 Acura MDX

delivery was quick. Trailer hitch was packaged well, good thing since shippers punched two holes in the box. Install took just over an hour for the trailer hitch and about another 15 min for the wiring harness. Wiring harness was easy to install but the diagrams were difficult to read and I wasn't sure if it needed two fuses or just the one 7.5 that came with it...less than 300 dollars and two hours time for what the dealer wanted 1200 for.


This is truly a great company. I've ordered many times and the products are always of the highest quality with excellent installation instructions. You can't go wrong!



Works great


It was quite a surprise to see that the Draw Tite Class III hitch that I purchased a few days ago, along with the wiring harness, arrived four days ahead of schedule. With the pandemic and problems with mail, this was amazing. All arrived in good condition.

Chad was also amazing as he was very easy to speak to; he listened to what I needed and gave great support. The order that I placed with him was easy and quick. Chad also let me know that I can always reach out to him if I had any questions or concerns.
I am pleased with the product and will have it installed next week. Thank you so much, Chad for your support and for reaching out to me if I needed anything.

E trailer is a great place to get your trailer hitch. I will be ordering from you again very soon. Christine R


I bought their own branded trailer hitch and it is excellent quality. I had it installed by myself in 10 minutes, really. The lighting controller took another 10 minutes. It all worked perfectly for a price that rivals the big internet sellers. What sets apart from the others is service and support. They have excellent product information so you know exactly what you are getting and how to install it. If you need support, they are there for that too.

Show More Reviews

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

  • What is Converter Box for On Trailer Wiring Harnesses for 2018 Acura MDX
    The black converter boxes you see on the trailer wiring harnesses for your 2018 Acura MDX are needed because the vehicle has a separate wiring system. This means that the brake and turn signals are sent along separate wires. Since standard trailer wiring uses the stop and turn signals on the same wire, a converter module is needed to combine these signals. The powered converter also helps to safeguard the factory wiring on the Acura and ensure that there is enough power to activate the...
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  • Does Battery of 2018 Acura MDX Have to Be Disconnected to Install Trailer Wiring
    Normally it's always a good idea to disconnect the vehicle battery any time you are working on anything electrical, but for the Tekonsha wiring kit part # 118628 there is no mention of disconnecting the battery prior to installing the kit so it would not be needed.
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  • Do I Need Relays From the Dealer for the Trailer Wiring to Work on a 2016 Acura MDX
    The additional relay that you mentioned in a tech tip was an isolated incident that should not be a problem on your 2016 Acura MDX. I spoke with two of the lead techs at Tekonsha and neither of them have ever heard of this issue before therefore, I think it is safe to say that the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118628 has everything that you need and you don't have to go to the dealer for any relays. There are however fuses included with the kit you...
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  • T-One 4-Pole Flat Wiring Harness # 118628 Installation Video for 2014 Acura MDX
    The recommended wiring harness for your 2014 Acura MDX is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118628. This kit includes a powered converter that connects directly to your battery, fuses, and a dust cover for the 4-way flat. I attached and install video for you along with the written installation instructions.
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  • Does T-One 4-Way Wiring Harness for 2019 Acura MDX Support Reverse Light Function
    The T-One Vehicle Wiring Harness # 118628 you referenced for your 2019 Acura MDX only carries the running lights and turn/brake light functions but we do have a way for you to add the reverse light function as well. Since all 4-Way wiring harnesses like the T-One carry these same functions you will need to use an adapter like the Tow Ready # 20036 which changes your 4-Way to a 5-Way that adds the reverse light function to the extra pin. Simply us the quick-splice to connect the blue wire...
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  • Do I Need a Transmission Cooler for Trailer Towing with a 2017 Acura MDX?
    Adding a transmission cooler to your vehicle that is towing a trailer is usually a good idea. The extra weight added by the trailer and its cargo puts additional strain on your vehicle's transmission, causing it to run hotter which will shorten the life of your transmission in the long run. For your 2017 Acura MDX, I recommend the Derale Series 8000 Plate-Fin Transmission Cooler # D13501. This is a Class II transmission cooler and uses turbulator plates for more efficient cooling. Dimensions...
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  • Best 4-way Connector for 2014 Acura MDX
    For your 2014 Acura MDX the best 4-way connector is the Tekonsha # 118628. We've installed many different brands of 4-way connectors but no matter the vehicle, we've found the Tekonsha harnesses to hold up the best over time, and due to that they are the hands-down favorite of our installers. I included a video of the # 118628 being installed for you to take a look at.
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  • Recommended Trailer Hitch for 2018 Acura MDX
    The best trailer hitch for your 2018 Acura MDX is the Class III # e98840 because of its hidden design, robust towing capacity of 6,000 pounds, and the fact that it is made right here in the USA. I also really like the unique matte black finish on this particular hitch that gives it more of a rugged appearance and also helps to prevent any scratches. This Class III hitch features a hidden-crosstube design where only the 2 inch receiver is visible behind the vehicle (see attached...
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    Image 1 for
  • Installation of Curt Trailer Wiring Harness on a 2018 Acura MDX
    Yes, installation of the Curt trailer wiring harness # C56192 will be essentially identical on your 2018 Acura MDX as it is in the video for the 2016, linked for reference. That same goes for the Tekonsha wiring harness # 118628 which also fits your MDX. Please note that with either harness it may be necessary to see a local Acura dealer for a relay. The relay is needed to activate the tow package wiring circuit.
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  • Recommended Trailer Wiring Harness for 2018 Acura MDX
    The wiring harness I recommend for your 2018 Acura MDX is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118628 because of its easy install. You will only need to plug in the connector at the rear of your Acura and insert the included fuses. Using Trim Pad Remover # ALL648544 will make it much easier to remove the panels in the rear of your MDX so you can make the necessary connections, and it is also recommended you use Dielectric Grease for Electrical Connectors...
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  • How Far Past the Rear Bumper Does Curt Trailer Hitch Stick Out on a 2015 Acura MDX
    When we installed Curt trailer hitch # C13146 on a 2014 Acura MDX the face of the hitch receiver has almost flush with the back of the bumper, see photo. It stuck out maybe 1/2 an inch. This should keep your shins bruise-free. I have bumped into hitches before and it does hurt. This one doesn't really stick out far enough to be a problem. The hitch does come with the mounting hardware. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It includes 2 ball mounts,...
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  • Can 12 Volt Circuit of Trailer 7-Way Keep Trailer Battery Topped Off
    Yes the 12 volt accessory circuit of a 7-way trailer wiring connector can keep a trailer house's battery topped off. Basically you'd run 10 gauge wire like part # 10-1-1 to the battery's positive battery post and you'd be set.
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  • Trailer Hitch for 2017 Acura MDX SH-AWD
    Yes I recommend the etrailer Class III - Item # e98864. The hitch is a custom fit hitch and mounts to the directly to the frame rails. If you are planning on towing a trailer I also recommend T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118628 and the Tow Ready Mounting Bracket 4-Pole Flat Item # 18144 I have attached links for the etrailer Hitch and Tekonsha T-One wiring harness on the 2017 Acura MDX SH-AWD to help walk you through the installation
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  • Is 18" The Tire Or Wheel Size That Fits With etrailer Trailer Hitch e98840 On 2017 Acura MDX?
    That is actually a great question! The actual wheel will need to be 18" or smaller for it to fit after installing the etrailer Trailer Hitch Receiver # e98840 on your 2017 Acura MDX. You will not need to actually measure the wheel, just look for the tire size on the spare tire and the last two digits will be the wheel size. For example if your MDX has the standard 245/60R18 tires, then the 18 at the end means the wheel is 18" in diameter and would fit just fine with this hitch. If you...
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  • Does Installation of etrailer e98840 Hitch Receiver on 2020 MDX Require Any Modifications to Body
    No, there isn't any lowering of the exhaust system or any other type of modifications to the undercarriage when installing the etrailer # e98840; it's actually one of the easier installations and should take roughly 30 minutes to complete. I've linked an installation video we did on a 2019 MDX that you might find helpful to follow along with during the process. If you're going to be towing with this hitch, you'll also need a wiring harness, ball mount and hitch ball. For a wiring harness...
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  • Trailer Hitch Recommendation for 2018 Acura MDX
    The hitch I recommend for your 2018 Acura MDX is the etrailer hitch part # e98840 because it is a 2 inch hitch size with plenty of capacity, has a hidden crosstube so it will be less visible, and because it has a cool looking black matte finish. I attached an install video for you to check out as well. For trailer wiring I recommend the T-One kit part # 118628 because it does not require any splicing to install and it has our most reliable converter box. I attached an install video for...
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  • Will etrailer Trailer Hitch Receiver Fit 2017 Acura MDX With Full Size Spare
    As long as the spare tire uses an 18" or smaller wheel, it will still fit after the etrailer Trailer Hitch Receiver # e98840 you were looking at is installed on your 2017 Acura MDX. If you have a spare tire with larger than an 18" wheel you will need to purchase a compact spare tire from your local Acura dealer, as none of the trailer hitch receivers offered for your vehicle will work with a wheel larger than 18". The etrailer # e98840 you were looking at is a great option due to it using...
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  • Parts Needed to Install a P3 Brake Controller in a 2015 Acura MDX
    The Prodigy P3 # 90195 is an excellent controller that can be installed in your 2015 Acura MDX. All you need is to install the proper wiring. You will need to start with a 4-way (if you do not have one). For that you would want the # 118628. 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...
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  • Will The Etrailer Trailer Hitch Receiver e98840 Fit A 2019 Acura MDX SH-AWD W/ Tech Package?
    Yes the etrailer Trailer Hitch Receiver # e98840 you were looking at is confirmed to fit your 2019 Acura MDX SH-AWD with the Tech Package which I have also confirmed. The # e98840 has a 900lb tongue weight rating and 6000lb trailer weight rating making it a great choice for towing a trailer, carrying a bike rack, or carrying a cargo carrier. If you are planning on towing with your MDX you will also need a vehicle wiring harness # 118628, and a hitch ball, ball mount, and hitch pin and...
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  • Alternative to etrailer Trailer Hitch Receiver for 2017 Acura MDX
    There is - as of this writing - a long scheduled wait time for the etrailer Trailer Hitch Receiver # e98840 that fits your 2017 Acura MDX, but we do have an alternative for you. What I recommend instead is the Curt Trailer Hitch Receiver # C13146. This is the exact same hitch, with the only difference being it has a more glossy coat than the etrailer hitch; they are otherwise the same, including the installation. So that's the route I recommend going to add a hitch to your 2017 Acura...
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  • Trailer Hitch and Wiring for a 2015 Acura MDX Tech with Sport Bumper
    The etrailer trailer hitch # e98840 is now listed as a fit for all styles of the 2015 Acura MDX including models with the sport bumper. At the time the answer you are referring to reflected the fit information that was available then. But now it has been determined the hitch will fit. If you plan on doing some towing you might be interested in 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...
    view full answer...
  • No Power To Brake Controller After T-One Vehicle Wiring Harness with 7-Way Install On 2015 Acura MDX
    It's possible that after you install both the T-One Vehicle Wiring Harness with 7-Way Trailer Connector part # 118289 and Tekonsha Prodigy P3 Trailer Brake Controller part # 90195 with Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers part # 3028-P on a 2015 Acura MDX that you still need to insert more fuses into the factory fuse box to power up the controller. These fuse locations will be listed either in the owner's manual or on the underside of the fuse box lid.
    view full answer...
  • Does a 4-Flat Vehicle Connector Work w/ Surge Brakes on a 2019 Acura MDX?
    Yes, the Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # HM11143270 will work with surge brakes. The wiring harnesses do not have any compatibility issues with surge brakes. However, I recommend going with the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118628 over the Hopkins connector. Tekonsha makes a more reliable product. This custom-fit T-One connector plugs into your MDX's junction box, which is located in...
    view full answer...
  • Is Relay Required to Install Wiring Harness in 2018 Acura MDX
    The note you are referencing in regard to the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118628 specifically says the relay is "needed" so it is required in order to activate the tow package on your 2018 Acura MDX. The reason it may be necessary to see your Acura dealer is because your vehicle may or may not have the relay. The relays are required to activate the tow package and it looks like this relay would be located in the fuse box under the hood of your Acura,...
    view full answer...
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Info for this part was:

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