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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Item # 118252
Our Price: $17.41
Custom Fit Vehicle Wiring

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118252 - No Converter Tekonsha Trailer Hitch 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 OEM tow package port - no cutting, splicing or tapping required. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118252 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 for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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Tekonsha Custom Fit Vehicle Wiring - 118252

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No 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 OEM tow package port - no cutting, splicing or tapping required.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Designed for use with a factory tow package
    • 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 behind rear bumper
    • Plug in connector
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's factory tow package wiring harness, which is located just behind the rear bumper.


Once installation is complete, the 4-way flat connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.


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.



118252 Tow Ready T-1 T-Connector - OE Replacement 4-Flat

Installation Details 118252 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:


Customer Reviews

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 118252

Average Customer Rating:  4.9 out of 5 stars   (280 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 OEM tow package port - no cutting, splicing or tapping required.

by:

This hitch was very easy to install. I did not have to lower the exhaust. I
just had to pull down a little for the hitch to slip over it. My vehicle was
already prewired from the factory so the wiring was simple plug and play.
One connector just had to remove the factory connector cover and plug it the
harness and route harness along hitch. A couple of long tie wraps, black
electrical tape or any other type of tape would work great for running the
harness along the hitch (not supplied). I am attaching several pictures
after the installation. It looks great and is very well hidden. Receiver is
all that shows with wire connector. There is about 12 to 18 inches of wire
above the facia that can be pulled down for use if needed. Very glad I
ordered the Curt hitch #13541 and T-One wiring Harness for the Factory Tow
package #118252. By the way Great service from ordering over the phone to
delivery.


Comments
The hitch on my 2012 and wiring harness are working out great. I even took it to my dealership and they added it to the their records on my vehicle, showing that I added the hitch and harness. They were also impressed with the way I trimed around the hitch, hiding as much as I could. My wife didnt even notice it for a week. This was the first time I used it. Good job with the design and fitment.
John G - 04/16/2014


by:

easy to install on the harness provided by the manufacture of the vehicle. Be sure your vehicle does have a wiring harness before ordering. Plug and go, with all the cable cover needed for easy installation.




by:
2020 Toyota Highlander

FITS the new 2020 HIGHLANDER! There is a new connector with the 2020 Highlander redesign under the driver side rear bumper. This cable plugs directly into the Highlander connector. See photo. There is no need to route or run wires for the trailer wiring. You will also need a converter to provide the correct signals to this cable. I recommend using the Toyota Plug-n-play converter part number: PT725-48200. It’s around $60 online. Be aware it is installed behind a panel located next to the driver’s side second row seat. Toyota completely changed the vehicle wiring for the 2020 model year. I also recommend the CURT C99FR hitch. Fits perfectly, easy to install and hides behind the bumper.




by:

I ordered and received a trailer hitch and wiring kit for my 2015 RX350 and also received a very informative video with it. It fit great and is almost invisible and no drilling was necessary. The only issue I had was I was supposed to reuse 2 of the bolts to rehang the exhaust but my bolts were tapered on the end and wouldn't fit so I had to use some generic bolts. But it's still a great product.




by:

Just installed Draw Tight hitch, wire assembly along with the brackets for a nice look. Everything went smooth with installation and it has a nice clean look as the hitch is well hidden. This is going to work for our bike rack and the cargo carrier I am now going to by. Now I can also get a small utility trailer to pull and haul stuff. I strongly recommend etrailer for all your needs as they communicated with me the whole way through and readily replaced a lock unit that somehow came without the key. Customer service is top notch.


Comments
Absolutely Fine!
Scott N - 04/26/2020


by:
2015 Lexus RX 350

The hitch and wiring harness were great quility and pretty straight forward to install but i encountered issues on each side with the two bolt holes towards the front of the vehicle being approximately 1/16" off from center and i had to remove the hitch and redrill the holes. Once i redrilled the holes, everything went together smooth.




by:

It’s very easy to install




by:
2015 Lexus RX 350

Worked great on my 2015 Lexus RX350.




by:
Lexus

Harness works great, hardest part of installation was getting 2 hands in the small area to connect the plug. That is not the fault of the harness, Lexus just didn't leave much slack.




by:

Everything aligned perfectly and I had the hitch and wire harness installed in less than 30 mins, solo.
So easy without a lift or jacks




by:

Easiest trailer hitch install ever.




by:

I've installed several trailer hitches in the past. The only way this installation would have been any easier would have been the young lady, taking the order, agreeing to come over and do it. I'll install these hitches all day for half what [the vehicle dealer] charges.

The 3 plastic/rubber plugs, on the left side, pop right out and the 2 tow bracket bolts, on the right side of the car, unscrew easily with a 19mm socket. I didn't have anyone to hold up one end of the hitch so I used an upside bucket to hold one end up while putting the two bolts in the other side.

The heat shield never came close to contacting the hitch, so no adjustments were needed.

The wiring harness was also easy to install. There's a pre-wired plug on the left side of the car near the exhaust pipe the harness plugs into. This car was ordered with the towing package so it's my understanding the harness is all that's needed.




by:
Lexus

very nice wiring harness. i have not hooked it up yet but it looks like it will hook up to my lexus hook up




by:

Perfect fit. Quick response & gd communication from etrailer.


Comments
Perfect,as expected
Nelson - 04/28/2022


by:
2016 Lexus RX 350

I got the trailer hitch the rubber hitch cover and the wiring harness delivered in 5 days from the day that I put my order in, very easy to install nice and tucked underneath the bumper,very well built and very well priced.




by:
Lexus RX 350

Worked really well with the 4-pin adapter and rental trailer. Fit my RX350 perfectly.




by:

I d’ont recive the good part for my cadillac xt4 the hitch is ok but the harness it for a lexus


Comments
I will have our Customer Service team reach out to you. The harness needed for a 2021 Cadillac XT4 is part # 118795
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
$23.12
.
-- Etrailer Expert Jenny N - 05/03/2022


by:

Works great. A must have to energize your trailer lights on a 2020 rx 350




by:
2015 Lexus RX 350

I have a 2015 Lexus RX350. Since it has the tow prep package this was about as easy as anyone could expect.




by:
Lexus

Easy install on Lexus RX-350




by:

I did not use or need the above cable my car was already prewired. I returned it and got the correct cable and it works great..




by:
2012 Lexus RX 350

Plugged right into my vehicle and works perfect, great price and fast shipping.




by:
2020 Lexus RX 350

Fantastic Tracking system! Great videos on how to install and quality products make this the go to site for me.




by:

The wiring plug and harness were an exact match to original specifications for a 19 year old factory install except for turn signals were reversed, this was a minor fix. The final price was OK, but I was disappointed that the website had shown a price of $14.08 less than 12 hours before I placed the order. When I placed the order the following morning the priced jumped to $20.08 plus shipping. After all is said and done, still a great value for the money.




by:

Lexus RX 350 came equipped with plug in wiring near hitch location. Installed in 5 minutes.


Comments
fantastic no problem
David M - 09/22/2021

25
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Show More Reviews

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

  • Where Does the Trailer Wiring Harness 118252 Install on a 2010 Lexus RX 350 with Towing Prep Package
    The vehicle side connector for trailer wiring on a 2010 Lexus RX 350 will be located behind the rear bumper more on the driver side of the vehicle. The connector will connect to the vehicle end of the Tow Ready wiring harness (gray plug) # 118252. I have included a link to the installation instructions for you.
    view full answer...
  • Removing the Protective Cap on a 2010 Lexus RX 450h to Install a Trailer Wiring Harness
    On the protective cap covering the connection point for trailer wiring on the 2010 Lexus RX 450h, there will be a locking tab on one side. You will need to push in the locking tab with your thumb and at the same time pull the cap off. When you go to connect harness # 118252 the locking tab on it will snap into place on the factory connector. I have included a link to the installation instructions for you.
    view full answer...
  • Recommended Trailer Wiring Harness for 2018 Lexus RX 350 with Tow Package
    For your 2018 Lexus RX 350 the Tekonsha T-One Vehicle Wiring Harness # 118252 will work perfectly. This custom harness will plug right into the OEM tow package port behind the rear bumper (see attached image) and provide you with a 4-Way connector to connect with and power your trailer's signal lights. Tekonsha is well known for producing durable and long-lasting wiring harnesses. I have attached an installation video that you can also use for reference.
    view full answer...
    Image 1 for
  • Installing Tekonsha T-One Wiring Harness # 118252 on 2018 Lexus RX 350L with Tow Package
    I spoke with my contact at Tekonsha and he said that if your 2018 Lexus RX 350L has the tow package there should be a factory plug somewhere on the driver side behind the rear bumper into which the Tekonsha # 118252 will connect. You may need to dig around a bit to find the plug which will have a protective cap on it. He said that there isn't a difference with the factory wiring between the Lexus 350 and 350L models. I have attached an installation video that you can follow along with...
    view full answer...
  • Troubleshooting Wrong 4-Way Flat Pin Size After Accident with 2012 Lexus RX 450h
    I've never heard of different-sized 4-Way flat connectors so I'm guessing the original 4-Way installed on your 2012 Lexus RX 450h is still there and was damaged when you were rear-ended. If you swap it out with the T-One # 118252 this will fix your problem. You can try adjusting the pins on your vehicle-side 4-Way but I would be concerned about damaging something on the wiring or your vehicle so swapping everything out is a better solution. Attached is an installation video of this wiring...
    view full answer...
  • Location of Trailer Wiring Harness Connector on 2010 Lexus RX350 Equipped with Tow Package
    The connector for the # 118252 is located behind the rear bumper of the vehicle, just a bit left of the rear bumper center-line. The photo I produced will show the location. Before purchasing the # 118252, confirm the presence of the connector. You should also remove the protective cover from the end of the plug and use a circuit tester like part # 40376 and confirm that the circuits are active. One of each of the 4 sockets in the connector should show power when the left turn, right turn,...
    view full answer...
    Image 1 for
  • Trailer Wiring Harness # 118252 Not Working on a 2012 Lexus RX 350
    The trailer wiring harness, # 118252, is for a 2012 Lexus RX 350 that came with a factory tow package. It sounds like your RX 350 does not have the factory tow package so you would need to use trailer wiring harness # 118478. If your vehicle is supposed to have the factory tow package (have the dealer run the VIN to determine if it does or does not have the tow package) then the missing components to make it active could be obtained through a dealer. I have included a link to the installation...
    view full answer...
  • No Power to Trailer Wiring Harness on a 2012 Lexus RX 350
    The trailer wiring harness # 118252 is designed to fit a 2012 Lexus RX 350 that came with the factory tow package. If your RX 350 did not come with the factory tow package then harness will not work. If you are unsure if your model has the factory tow package you can have a Lexus dealer run the VIN in their system and tell you how the vehicle is equipped. There are fuses if the vehicle has the factory tow package. under the hood in locations 43 and 44, and in the cab of the vehicle in...
    view full answer...
  • Troubleshooting Wiring Harness for 2010 Lexus RX 350
    The trailer wiring harness, # 118252, is for a 2010 Lexus RX 350 that came with a factory tow package. It sounds like your RX 350 does not have the factory tow package so you would need to use trailer wiring harness # 118478. If your vehicle is supposed to have the factory tow package (have the dealer run the VIN to determine if it does or does not have the tow package) then the missing components to make it active could be obtained through a dealer. I have included a link to the installation...
    view full answer...
  • Correct Wiring Harness for 2013 Lexus FWD RX 350 w/ Tow Package
    Both will work fine actually, the Curt Harness part # 56083 has been confirmed to fit by Curt on your 2013 Lexus RX-350 and we had a customer try the # 118252 on a 2013 model and it worked for him as well. If you look at the grey connectors on both of the harnesses you will see that they are the exact same.
    view full answer...
    Image 1 for
  • Is Wiring Harness for Trailer Connector Needed on 2012 Lexus RX350 With Factory Tow Package
    If your 2012 Lexus RX350 came with a tow package you will probably still need the Tow Ready T-One Wiring Harness, part # 118252. This wiring harness will plug into a square 4-pin female plug located behind the rear bumper on your vehicle. It will give you a 4-Flat connector that will plug into a 4-Flat connector on a trailer. I am including a link to the installation instructions on the Tow Ready wiring harness. It will picture where the connector is on your vehicle and what it looks like. I...
    view full answer...
    Image 1 for
  • Troubleshooting No Power at Factory Port on 2017 Lexus RX 350 without Factory Tow Package
    If your 2017 Lexus RX 350 didn't come with the factory tow package then an additional harness with a powered converter is needed to actually activate the plug that you used to install the Tekonsha T-One Vehicle Wiring Harness # 118252. This Tekonsha harness is designed for vehicles that came equipped with the factory tow package. Unfortunately, the converter harness is not available as a separate item from the manufacturer so your only option is to get the Tekonsha T-One Harness # 118255...
    view full answer...
  • Trailer Wiring for 2019 Lexus RX 350
    We have two really great and easy to install trailer wiring harnesses that fit your 2019 Lexus RX 350. We have the Tekonsha kit part # 118255 for if you do not have the factory tow package, or if you did have the tow package part # 118252 which is just the 4-way connector of the # 118255. Most reliable and efficient way to determine if your vehicle has the tow package is to contact a Lexus dealer with your VIN and they'll be able to look up what options the vehicle came with.
    view full answer...
  • Does Wiring Harness # 118252 Fit 2017 Toyota Rav4 LE?
    The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118578 is the confirmed fit for the 2017 Toyota RAV4. This custom-fit T-One connector plugs into your Toyota RAV4's wiring harness, which is located inside your trunk, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access the harness. Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to...
    view full answer...
  • Does Wiring Harness 118252 fit a 2006 Toyota Tacoma
    There are wiring harnesses that will fit a 2006 Toyota Tacoma but the # 118252 will not. Instead, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118496. I have attached a link to a video review of this harness for you as well as a link to one being installed on an '06 Tacoma.
    view full answer...
  • How to Determine if 2017 Lexus RX350 Has Factory Tow Package
    I'm assuming that you're needing to know so you can choose the correct wiring harness, correct? You could call your Lexus dealer and give them your VIN, and they should be able to tell you how your RX350 is equipped. Or, you could remove the inside cargo area bulkhead on the passenger side to find the gray tow package plug. If there is already a black taillight converter box plugged into the connector, you have the tow package and would use the # 118252. If there is nothing plugged into...
    view full answer...
  • Trailer Wiring Harness that Plugs Into Factory Wiring of 2020 Lexus RX 350
    Yes we have the Tekonsha trailer wiring harness part # 118252 which plugs right into the factory trailer wiring connector of your 2020 Lexus RX 350.
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  • Can Just the Converter Section Be Purchased of the Trailer Wiring Harness for a 2013 Lexus RX 350
    It sounds like you are wanting to install a trailer wiring harness on a 2013 Lexus RX 350. If that is the case we have some great options. I recommend the T-One Vehicle Wiring Harness, part # 118252 for with factory tow package or part # 118255 for without factory package. The latter is sold as a kit and cannot be broken up individually. If you only need the converter section you will still need to purchase the entire kit as that is how the mfg. offers it.
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  • Choosing The Correct Tekonsha T-One 4-Way Flat Harness For a 2017 Lexus RX 350
    If your 2017 Lexus RX 350 did not come from the factory with the trailer connector and receiver you will need the T-One Vehicle Wiring Harness # 118255 that includes both the harness for the 4-way and the powered convertor harness. The T-One Vehicle Wiring Harness for Factory Tow Package # 118252 is only designed to replace a damaged factory connector. It is missing the powered convertor. The convertor is not sold separately so you will need the Harness # 118255 if you do not have the...
    view full answer...
  • Trailer Wiring Harness Options for a 2010 Lexus RX 350 All Wheel Drive
    The definitive way to determine if your 2010 Lexus RX 350 has a factory tow package would be to have a Lexus dealer run the VIN number. They will be able to tell you what options the vehicle has. You could also test the factory connection point for # 56083 or # 118252, see instructions, to see if there is power to the factory plug. However, it may show that it works because it is not under load (a trailer connected). But under load, if you do not have the complete tow package and use #...
    view full answer...
  • Trailer Wiring Recommendation for a 2013 Lexus RX 350 without Tow Package
    The # 118252 is designed to be attached to a plug under the rear of your vehicle. If you do not have the plug or it is not active, I have a solution for you. The Curt # C59236 would be the perfect solution for your 2013 Lexus RX 350. I spoke with my contact at Curt and he verified that this harness will work for your vehicle. This universal harness will hardwire directly into your vehicle's wiring and bypass the factory tow package setup.
    view full answer...
  • Trailer Wiring Harness for a 2016 Lexus RX 350 without Factory Tow Package
    The base model 2016 Lexus RX 350 is not likely going to have the factory tow package. But to be sure you could have a Lexus dealer run the VIN to tell you how the vehicle is equipped. Without the factory tow package I recommend trailer wiring harness # 119250KIT. This harness does not require any splicing into the vehicle wiring. Its connectors clamp around the vehicle wires to detect the current passing through them.
    view full answer...
  • Finding the Right Tail Light Wires to Install a Trailer Wiring Harness on a 2016 Lexus RX 350
    You will need to use the included circuit tester with the # 119250KIT wiring kit to test the tail light wires on your vehicles and then make the connections accordingly. The connectors are labeled. The one with the yellow sticker is left turn signal, red is brake lights, brown is running lights, and green is right turn signal. There is also a white ground wire and a power wire. The power wire will attach to the vehicle battery. I have linked an article with tips on routing the power wire.
    view full answer...
  • Trailer Wiring for 2018 Lexus RX 350L Without Factory Tow Package
    If you are sure your 2018 Lexus RX 350L does not have the factory tow package then your only option is to hardwire a 4-way to your vehicle with a universal kit, the Upgraded Modulite Vehicle Wiring Harness Kit with 4 Pole Trailer Connector # 119147KIT. This kit is going to require you to splice into wires as well as run a 12 volt hot lead from the battery of your 2018 Lexus RX 350L. I have added a link to a video of an installation for you to check out; it can be difficult so this is one...
    view full answer...


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