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  1. Custom Fit Vehicle Wiring
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  4. Tekonsha
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118652
Our Price: $71.09
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Custom Fit Vehicle Wiring

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Tekonsha Trailer Hitch Wiring - 118652
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Call at 1-800-940-8924 for expert service. We are your Lexus custom fit vehicle wiring experts, and offer a great price. carries a complete line of Tekonsha products for your Lexus 2020. T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part 118652 from Tekonsha can be ordered online at Complete custom fit vehicle wiring installation instructions and technical support.
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Tekonsha Custom Fit Vehicle Wiring - 118652

  • 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. 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
    • Locate connection points
    • Plug in T-connector
    • Run hot lead to car battery
  • 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: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness.

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

118652 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118652 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118652

Average Customer Rating:  4.9 out of 5 stars   (43 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. Powered ModuLite reduces strain on wiring system.


As always, very happy with our e-trailer purchase. This is our second lexus that we fit with a hitch and wiring. Great support from e-trailer, and very happy with the products and pricing.

Still working great! We use it often.
Jeanne - 03/04/2023

2021 Lexus NX 300

The product appears to be high quality and well built. Service was great and the product arrived on time or slightly before the expected delivery date.


I bought this for my 2018 Lexus NX 300h. Now that it’s installed, it works great and tucks away nicely when not being used. The biggest challenge was knowing where the tail light harness was. No amount of searching Google was helpful. I was really not excited about removing all the panels in the back. Eventually figured it out though and the panels I had to remove was minimal. Did require some dexterity and skinny arms though.


This Tekonsha wire harness works great for my 2017 Lexus NX200T, as expected. (Do note that I had performance issues with a different brand). Sales person demonstrated product knowledge and provided excellent service by researching the answers to my questions that she was not 100% sure of.

2017 Lexus NX 200t

Boy, this couldn't be easier. I ordered the hitch for my wife's new Lexus and it only took two days to show up on the door step. This last Saturday I had the time to install it myself. It only took me 18 minutes (yes, I timed it..) from driving up my ramps to driving off. It fit great, only took four bolts it attach, torque it all down and I'm good to go. Thanks etrailer!

2016 Lexus NX 300h

Great hitch. I work for a lexus dealer so I have seen the OEM one first hand. And know how much of a pain that is to install. It took my tech less then 10 minutes ago install and have it torqued down.

My NX is the hybrid one so the battery is in the trunk. So running the power to that was easy. Start to finish it took less than 30 minutes. Could not be happier.

If i have to make one complaint is that the hitch sits kind of low compared to the bumper. But the hybrid lower bumper is different from the turbo version.

Can't wait to use this!

2016 Lexus NX 200t

I ordered a Draw-Tite hitch and electrical harness for our NX 200t. The idea was to put the hitch myself and torque it on and then have an expert snap the trailer wiring on when I got it. All went well and we are just waiting for our kayak trailer now. The Draw-Tite is a good looking hitch and seems to be well made. We are looking forward to finding out whether the hitch and wiring will work well into the future for us. I see no reason that they won't.

I had seen where others putting this hitch on saw that their exhaust tips lowered after they finished. They are correct. Our tips are no more than an inch lower than previous factory measurements. This is after torquing them to 92 ft-lbs. They still look problem!

Funny you should ask this now as my wife & I are vacationing & using our Hobie kayaks & of course our hitch & pigtail for use with our Sylvan Sport trailer. Both of these accessories are working wonderfully. We have used them many times since purchase.
Craig G - 07/27/2018


The hitch is fantastic. I have made several trips with a cargo tray in the hitch, which had ample clearance for the tailgate opening. Pulling a small trailer during a move went smoothly as well. However, I had an issue with the Tekonsha wiring harness. Instructions were inadequate to install this package on my hybrid vehicle. Repeated calls and correspondence were met with a passing of the buck for panel removal and access to the required spaces for installation. Fortunately I was able to find more complete instructions from a competitor's site - a shock to me from what I have grown accustomed to at etrailer. But now installed, I love the set up, but ET won't be the only site I search when my future trailering needs arise.

2015 Lexus NX300h

Quick delivery. Installed trailer hitch and wiring on a 2015 Lexus NX300h. Hitch fit perfectly with minimal effort. Wiring was more difficult, but worked fine. Only a couple hours work total.

Jim D what made the wiring difficult ?
-- comment by: Mike K - 08/16/2015
The difficulty with the wiring was that the connectors to the tail lights in the NX were difficult to get to. They were secured up behind some metal bracing. Once they were freed, it was easy to connect the Tee into the circuit. Worked fine once connected.
-- comment by: Jim D - 08/18/2015

2017 Lexus NX Turbo

Good product. Suggest improvement in the installation instructions - specific for the vehicle ordered ! For 2017 LEXUS NX200T - You must at least loosen the back of both side panels to get to taillight connectors! And all the other stuff to get to them. Be aware that the automatic brake electrical control connector is the same as the connectors for the tail lights!


Not the fault of the harness, but it is extremely hard to get to the tail light connectors to connect on my vehicle. The 4 wire flat trailer connector could be a few feet longer as it's a bit taunt when the install is complete thus the 4 stars instead of 5.

2015 Lexus NX-200t

The product was excellent but the installation documents could have been better. It took much longer to find the connectors than expected. In the end the installation works perfect and saved me a ton of money compared to the car dealer installation price.


Went in perfect

Karl R - 01/05/2022

2015 Lexus NX 200t

Product worked great. The installation instructions were detailed and very helpful.
Thanks etrailer.


Harness was exactly as described. Has been installed for a little over a year and it works perfectly! Thanks etrailer!


Excellent service. Great online ordering Information. Definitely will order again


Best online shopping experience I have ever had

2021 Lexus NX 300

I have a 2021 Lexus nx300 and it work flawlessly. Both the hitch and the wiring.


Great product matched to my vehicle and at a reasonable price.

2016 Lexus NX 200t

Received the product quickly and installation was easy!


Easy to install and great service from e trailer.


Perfect fit and outstanding quality!

2015 Lexus NX 200t

The wiring kit was easy to install and fit perfectly.


Exactly what I needed. Works great every time. Harness comes right out of my spare tire well and gets pinched from my trunk as it hangs over the bumper. Very durable. Came with everything I needed.


Easy install , great product , 1 year of salt water use in boat ramps and still working like new.

Show More Reviews

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

  • Troubleshooting Trailer Brake Lights Not Working
    I would start by testing the trailer wiring harness, # 118652, you just installed on your 2017 Lexus NX200t. Use a circuit tester like # 3808 and test each function. If the problem is on the vehicle then check for any fuses related to trailer brake lights. If it's not a fuse you'll need to check the wiring connections you made when installing the harness. If everything checks out at the 4-way trailer connector then the problem is on the trailer. Inspect the trailer's 4-way and make...
    view full answer...
  • Installing Tekonsha Wiring Harness # 118652 on 2016 Lexus NX 300h
    I am sorry to hear about the issues you're having trying to gain access to the connectors behind the tail lights of your 2016 Lexus NX 300h. I reached out to my contact at Tekonsha to see if he had any insight on this and he said they haven't received any customer feedback themselves on the T-One # 118652 regarding the install process so he wasn't able to provide any additional info. I definitely do see the other customer reviews that you mentioned describing similar trouble though. You...
    view full answer...
  • Trailer Wiring that Fits 2020 Lexus NX 300 F Sport
    Tekonsha has the # 118652 that fits your 2020 Lexus NX300 F Sport but the part number you mentioned does not fit.
    view full answer...
  • What 4-Way Wiring Harness do You Recommend for My 2017 Lexus NX 300h?
    I have a great solution for a 4-way wiring harness for your 2017 Lexus NX 300h F-Sport. I went ahead and confirmed with Curt that the Custom Wiring Harness # 56268 does not fit your vehicle. With that being said, the Tekonsha T-One Harness # 118652 definitely fits. The great thing about the Tekonsha line of harnesses is that it comes with a higher-quality converter box than our Curt and Hopkins brands of harnesses. At the end of the day, we always recommend Tekonsha harnesses because they...
    view full answer...
  • Trailer Wiring Harness to Fit a 2017 Lexus NX 200t
    We do carry trailer wiring for your 2017 Lexus NX 200t but the # 118255 harness is custom fit for several different Lexus models. Instead the harness you want for your Lexus is part # 118652. I've linked the install details for you to take a look at. I confirmed the fit with Tekonsha to be sure. If you're also looking for a trailer hitch part # 75956 is confirmed to fit your Lexus as well.
    view full answer...
  • Removing Trim Panels to Install Trailer Wiring Harness on a 2017 Lexus NX200T
    The only instructions for wiring harness # 118652 are the basic install instructions that come with it and that I have linked for reference. What I recommend for trim panels are trim panel tools # PTW80647 which will work much better than metal tools like screwdrivers that can potentially damage plastic trim panels. I have linked a video showing how they work.
    view full answer...
  • Trailer Hitch Recommendation for 2017 Lexus NX 200t Turbo
    Yes we do! Check out the Draw Tite hitch part # 75956 which is a confirmed fit for your 2017 Lexus NX 200t Turbo and would be a fraction of the price as the Lexus dealer option. For trailer wiring we then have the Tekonsha kit part # 118652 which is also a custom fit option. If you wanted to do 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 drop. It also...
    view full answer...
  • Comparison Of Curt And Tekonsha Wiring Harnesses For 2017 Lexus NX Turbo
    Both the Curt # C56268 and T-One # 118652 wiring harness are designed to work with your 2017 Lexus NX Turbo. The difference between the two harnesses is that the T-One maximum amperage draw is 2.1 amps for stop/turn lights and 7.5 amps for tail lights. For the Curt harness the maximum amperage draw is 3.0 for stop/turn lights and 6.0 for tail lights.
    view full answer...
  • Installation Process for 4-Pole Trailer Wiring Harnesses C56268 and 118652 on 2016 Lexus NX 200t
    For the 2016 Lexus NX 200t F-Sport both of the aftermarket 4-pole wiring harness kits we offer, Curt # C56268 and Tekonsha # 118652, use a separate 12V power wire that will be run to the battery and connect through an included fuse holder. This separate power connection delivers the actual current to operate trailer lights, bypassing the vehicles internal wiring. This isolates the car's wiring from any potential damage from short-circuits on the trailer. Apart from this one power wire...
    view full answer...
  • Trailer Wiring Harness Recommendation for 2015 Lexus NX 200t
    For your 2015 Lexus NX 200t the Tow Ready harness part # 118652 is a confirmed fit. There actually aren't any install videos for this specific harness so you may be thinking of the # C56268 which is also a fit for your vehicle and does have a review video which I linked. The converter boxes do look different. The Tow Ready would be the kit I would recommend though as we have the best luck in terms of reliability with this brand.
    view full answer...
  • Trailer Hitch Recommendation for 2015 Lexus NX 200t and Parts Needed to Tow Trailer
    The trailer hitch I recommend for your 2015 Lexus NX 200t is the Draw-Tite Class III Round Tube Receiver Hitch # 75956. I like this hitch because there is no drilling required to install this trailer hitch and it has great reviews from our customers. This trailer hitch has a 3500 pound towing capacity, which is plenty to tow a 1,500 pound motorcycle trailer. The installation instructions for the hitch are linked for you. You will also need trailer wiring, a ball mount, and hitch ball...
    view full answer...
  • Trouble Locating the Factory Taillight Wiring Harness On a 2016 Lexus NX 200t
    The T-One Vehicle Wiring Harness part # 118652 is a confirmed fit for your 2016 Lexus NX 200t. This harness actually installs inline with the factory taillight wiring harness so there will not be any sort of unused plug if that was what you were looking for. In order to access the factory taillight wiring harness you need to remove a few trim panels. I have then attached a photo that shows where the factory taillight wiring harness is located. Unfortunately, we have not yet had the chance...
    view full answer...
    Image 1 for
  • Does the Curt hitch # C13337 Fit the 2021 Lexus NX 300 F Sport?
    Yes, I can confirm that the Curt Trailer Hitch Receiver 2" item # C13337 does fit the 2022 Lexus NX 300 F Sport model. If you are in need of a wiring harness I recommend the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector item # 118652. The T-One connector plugs directly into existing wiring giving you a 4-flat connector to control your trailer's lighting functions.
    view full answer...
  • Does Curt Trailer Hitch Receiver Fit 2021 Lexus NX 300 F-Sport
    Yes it does! I checked directly with the manufacturer for you and verified the Curt hitch you mentioned is a fit for your 2021 Lexus NX 300 F-Sport: - Curt Trailer Hitch Receiver # C13337 The # C13337 is a nice choice for a hitch and is a simple, bolt-on installation that does not require any type of drilling into the frame of your Lexus or cutting/trimming of its bumper or fascia. I also wanted to mention, just in case you were going to use this hitch for towing, that if you need a...
    view full answer...
  • Will the Curt # C13337 Fit My 2021 Lexus NX 300 F Sport Model?
    Yes! I am happy to confirm that the Curt Trailer Hitch - 2" # C13337 will fit the F Sport model of 2021 Lexus NX 300. The great thing about this hitch is that it comes with a gloss outer coating over the base powder coat that provides superior protection against rust and corrosion than other brands. Also, it assembled here in the U.S.A. If you need wiring to complete your setup, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118652. With this harness, you provide your trailer...
    view full answer...
  • Which Trailer Hitch Receiver Fits A 2019 Lexus NX 300 F-Sport?
    Both the Curt Trailer Hitch Receiver # C13337 and Draw-Tite # 75956 are confirmed to fit your 2019 Lexus NX 300 F-sport. Between these options I recommend the # C13337 as it has a higher tongue weight rating of 525lbs, and in our experience the powder coat finish of the Curt hitches is a bit stronger and holds up better over time. If you are planning on towing with your NX 300 F-sport you will also need a vehicle wiring harness # 118652. I included a few videos of the products mentioned...
    view full answer...
  • Trailer Hitch and Wiring Recommendations for a 2017 Lexus NX200t F Sport
    It looks like for the 2017 model year it would be a Lexus NX Turbo in our fit guide. Curt trailer hitch 13214 stops at the 2016 model year so 2017 will require a different hitch. The comparable Curt hitch for the 2017 is # C13337. Or you could use Draw-Tite Class III Max Frame Round Tube Receiver Hitch - 2017 Lexus NX Turbo # 75956. For either of the above mentioned hitches the manufacturers state they will fit all styles of the 2017 Lexus NX200t so that would include the F Sport models. If...
    view full answer...
  • Class III Trailer Hitch Installation Points on 2016 Lexus NX 200t
    The Curt Class III hitch # C13315 made for your 2016 Lexus NX 200t does indeed use a different mounting point than the Draw-Tite # 75956. The reason is that the higher tongue weight (TW) capacity of the Curt hitch, 600-lbs, requires installation on a different section of the frame. My contact at Curt confirmed this for me. The other hitches' TW capacities are 350-lbs. I'd definitely go for the Curt hitch for your car. All hitches fit your car, install without drilling and come with the...
    view full answer...
  • What Hitch do you Recommend for my 2016 Lexus NX 200t when Using a Motorcycle Carrier
    The Curt Trailer Hitch Receiver part # C13337 is the only option that will fit your needs. When using a carrier like yours you use the Tongue Weight or TW to determine the capacity available. This hitch is rated for up to 525 lbs. of TW your carrier and bike weigh in at 520 lbs. based on the info you provided. That falls right in line with the hitch. I have linked an installation video on the hitch for you to check out. I do need to advise you to check your owner's manual and see what...
    view full answer...
  • Can 12V Source Other than Battery Be Used When Installing Trailer Harness On 2017 Lexus NX
    The problem with attaching the 12V hot wire to any 12V plug or accessory in the vehicle is that the plug you found may be on a circuit with another item in your Lexus. You really want to make sure the wiring harness is on a circuit by itself. That way it protect the vehicle electrical system if anything happens like damage or a short. There is an inline fuse with the # 118652 harness that protects the converter and the wiring. I do not recommend using any 12V source other than the battery...
    view full answer...
  • Trailer Hitch for 2015 Lexus NX200t F Sport Model
    I checked with Draw-Tite and Curt, and each of the trailer hitches available for your 2015 Lexus NX200t, the Draw-Tite # 75956, Curt # C13337 and Curt # C12143 will fit your F-Sport model. Though none of these hitches are going to be hidden, I recommend the Draw-Tite # 75956. If you take a look at the accompanying photo from one of our customers, you can see this hitch installed on a F-Sport model and how it looks. This is a Class III hitch with a 2" receiver, maximum tongue weight capacity...
    view full answer...
    Image 1 for
  • Trailer Hitch, 7-Way Trailer Wiring, and Brake Controller for a 2017 Lexus NX 200T
    I will be happy to get you set up with everything you will need to tow the trailer. Draw-Tite trailer hitch # 75956 does fit the 2017 Lexus NX turbo models. It is rated for 3,500 pounds gross trailer weight so it has plenty of capacity for the 1,500 pound trailer. Since you will be doing some towing you can use 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...
    view full answer...
  • Will Installing Hitch on 2019 Lexus NX 300 Cause Hands-Free Liftgate to Unintentionally Open
    I've checked with my Curt representative regarding your concern. I'm told that there's zero recorded instances of any hitch install causing the rear hatch of a 2019 Lexus NX 300 (or any other vehicle, for that matter) to open unintentionally without movement picked up by the sensors. If you'll be towing with the hitch, you'll also need a trailer wiring harness like # 118652, a ball mount like # D-28 along with a # PC3 hitch pin and a trailer ball like # 19260 for a 1-7/8 or # 63845 for...
    view full answer...

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