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

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

Item # 118255

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Custom Fit Vehicle Wiring

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118255 - Powered Converter Tekonsha Custom Fit Vehicle Wiring
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  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Tekonsha
  • Powered Converter
Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system. Call 800-298-8924 to order Tekonsha custom fit vehicle wiring part number 118255 or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.


  • All Info
  • Reviews (62)
  • Q & A (67)
  • Videos (1)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118255

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring - no cutting, splicing or tapping required. Powered ModuLite reduces strain on wiring system.


Features:

  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Tow harness with 4-way connector plugs into port behind rear bumper
    • ModuLite connects in rear cargo area
  • Includes ModuLite power module that connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 2.1 amps per circuit
    • Tail lights: 5.6 amps per circuit
  • 1-Year limited warranty


Installation

This custom-fit T-One connector plugs into your vehicle's wiring harness. The connection point for the ModuLite power module is located behind the interior trim panel in your rear cargo area. The 4-way tow harness plugs in just behind the rear bumper. Once you've made the required connections, insert the included fuse into the in-line fuse holder.


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


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 Power Module

A ModuLite power module is built into this T-One connector. 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.



118255 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite



118255 Installation InstructionsInstallation Details 118255 Installation instructions

This Product Fits The Following Vehicles

2010 - 2018 Lexus RX 450h

2013 - 2019 Lexus RX 350 excluding F Sport

2013 - 2019 Lexus RX 350 F Sport

2010 - 2019 Lexus RX 350 without factory tow package

2010 - 2018 Lexus RX 450h without factory tow package

2018 - 2018 Lexus RX 450h L without factory tow package



California residents: click here


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


Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 118255 Review

Today we're going to review part number 118255. This is the tow ready T1 vehicle wiring harness with the four way flat trailer connector. This is a custom fit part. It is designed to fit the 2010-2012 Lexus RS450H vehicles. On a custom fit part what I always recommend for you to do is to go to our website, use our fit guide, put your year and model vehicle in there and it'll show you if this will work for your application. This harness will provide this four way flat trailer connector to back your vehicle to power your trailers signal lights. It connects very quickly and easily.

There's no cutting or splicing of wires. Basically the module light portion right here with the inline fuse holder connects in the rear cargo area on the passenger side. This wiring harness with the four way plugs into a port behind the rear bumper. The module light that's included is a powered module and it connects directly to the battery and this is to avoid overloading your vehicle's electrical system. The wiring in this is all constructed of a 16 gauge bonded wire. Do you notice on the four way it does come with integrated dusk app which is nice so when you're not plugged into you trailer, you put your dusk app over your terminals and it protects it from any damage or from the elements. This part here comes with everything shown here on the table and in a minute I'm going to show you where they all go.

A few specs on this harness. The maximum amperage for the stop and turn light circuits is 2.1 amps per circuit. Om the tail light circuit its 5.6 amps total. It comes with a nice set of detailed instructions that tell you how to install it and even show pictures of where your connection points are. Basically what you would do is go to the rear cargo area of your vehicle. What you would do is take the module light, which is this portion right here, and you'll see there's a 10 pin plug right here.

What you'll do is you'll find the 10 pin plug in the rear cargo area on your passenger side. What you'll do is plug this right in. This will match up to that connector. Plug this right in. Your inline fuse holder you'll want to make sure it comes with a 10 amp fuse in it. You want to make sure that fuse in put in the fuse holder.

What you want to do is this module light, to keep it from bouncing around, you probably want to attach it down. They have a tab here with a hole in it you can put a screw through, or you can use any of the cable ties to secure it also. The other part, this wiring harness with the four way connector to it, this actually will plug into a port behind the rear bumper. If you go behind the rear bumper you'll see a port that will match up to this one. Plug it in, run your four way out the back, and you'll be ready to go. One last thing I do want to mention is you notice you get some cable ties to take up any slack in the wiring, and as I mentioned, if you need to install this, you can also use a cable tie. One last thing though you gotta remember is there's this 10 amp mini fuse, and on some of the vehicles it may not have this fuse in place. This may need to be installed in the fuse panel of your vehicle. That's located near the emergency brake pedal. What I would recommend is to go to your owners manual and it will tell you where this goes. When you check your fuse panel, if there's one already there, you won't need it. If by chance there isn't one there, you will need to put this 10 amp mini fuse in place. That should do it for the review on part number 118255. This is the tow ready T1 vehicle wiring harness with the four way flat trailer connector.


Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118255

Average Customer Rating:  4.9 out of 5 stars   (62 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.

- 118255
by:
2013 Lexus RX 450h

I have a 2013 RX 450h without the tow package option. I purchased the Curt Receiver Hitch C13143 and installed it with no problems. I thought that my vehicle had the factory Tow Option so I ordered the Vehicle wiring Harness with 4-Pole Flat Trailer Connector- 118255 (for use with a vehicle that has the factory Tow Option). While waiting it's arrival I called the dealer and asked if my VIN had the factory Tow Option. It turned out that it did not, I expected #118255 that I had ordered was the wrong Item. It turned out that the wiring differences between the Tow Option vehicle and the non Tow option vehicle are the components in this kit (118255). The 4-pole cable plugs into a connector under the left rear bumper. (Remove the pan under the bumper). The converter module plugs into the connector in the right rear of the trunk. Just remove the small tray and it is near the tail light. Presto, power to the 4-pole trailer connector, it couldn't be easier. I read about etrailer.com in the Lexus Owner Blog and join the many others that sing the praise the company. 275173



- 118255
by:
2011 Lexus RX 350

It took an hour to install this item, not complaining since I tend to move slower than most shade tree mechanics. It was fairly simple to do and it works just as advertised. Would recommend this product to others for sure. Just remove the aft plastic, pull up the side covering and you will see the connector right there. I went ahead and secured the device using a sheet metal screw in a bracket that I drilled under the floor by the side container. See pics. Did not need the trailer hitch wiring as this came with the Curt hitch. I now have a spare if needed. 593207



- 118255
by:
2016 Lexus RX 350

2016 RX 350. This kit is excellent. Installs easily on the 2016 RX. Remove the trunk cover to expose the spare tire area. Remove the first aid kit (velcro) from the passenger side rear wall. On inside corner cover, pry up the center of black plastic fastener and remove. Reach under the cover with small plier and squeeze hidden second fastener's prongs to pop the cover loose. The white connector for the kit's 10 pin adapter, located in the passenger side rear location will have a black rubber sheath. It is located slightly up and out of sight toward the rear of the vehicle. Secure the adapter to prevent rattling. I used the tab with hole on the adapter with a cable tie to an existing sheet metal hole and some duct tape to restrain the wires. The four-way cable connects to an existing grey connector under the driver side rear underside near the bumper. Loosen the locking tab with a small screwdriver and remove the connector cover. Connect the cable and use cable ties to strain relieve the harness at your desired location. 448246



- 118255
by:
2015 Lexus RX 350

This was the missing piece! I had a towing hitch mounted on my 2015 Lexus RX 350 by the Lexus dealer. I tried to hook up my trailer and noticed the lights did not work. When I returned to the Lexus dealer they informed me that since I did not have the pre-towing package installed on my car that the lights would not work. I asked them what it would take to install the pre-towing package and they said that couldn't install one on my vehicle. After some google searching I came across this package at etrailer.com. It arrived quickly. I installed it today. If I had known what I was looking for it would have taken me about 10 minutes total to install. As it was it took me 15 minutes. I also had to go get a test light for a 4-pin connector since I only had a 7-pin connector test light. The hardest part of the whole installation was finding the plug to plug in the converter box. It is tucked up under the rear deck plate under the passenger taillight side. I used a mirror and flashlight to find it but realized that one I knew where it was I could feel it and pull it down just enough to plug the converter box into. A couple of tie wraps later, voila! It works. Thank you etrailer.com for your product and videos. I would have taken pictures but it was starting to rain and I wanted to close it up quickly. 562850



- 118255
by:
2013 Lexus RX450H

AWESOME!!! I was a bit concern while making this purchase, initially. I looked all over and compared notes from Tow Ready to various other vendors and had a mixed bag of feed back on the compatibility of this on my 2013 RX450H w/o tow package. Tow Ready also did not list 2013 as a compatible year. Well, after only 15 minutes to install this, I can confirm that this is working just fine on my vehicle, I've also verified it using a multimeter on the output. A quick shout out to Julie H. at etrailer for her outstanding client service. Overall was an AWESOME experience!!! and would highly recommend this product and etrailer. 177171


Comments

Thanks for your comment, specifically regarding the the 2013 RX450H without towing package. I was able to install this part quickly and easily. Earlier I had installed the Lexus trailer hitch, which came with the gray cable and connected those pieces, but I only recently discovered there was no power to the wire harness. Now with the ModuLite Power Module installed there is power to the wire harness and my trailer lights work perfectly. I too had a great experience with customer service and support team Carrieann and Dustin

-- comment by: Doug H - 01/06/2016

16359

- 118255
by:

Installation was very straight forward. Highly recommend. 697837



- 118255
by:

I just installed this kit on my Lexus RX350 I removed the interior floor cover that covers the spare tire. Then on the passenger side I removed the small cover on the right and pulled up the black tray with that removed up under the side panel and found the connection that is covered with plastic and plugged in the module until it snapped into place. Replaced all removed items and ran the wiring from the hitch back to the plug under the driver side under the rear bumper and tucked excess wire there with cable ties. DONE works great total time to install 10 minutes. I anticipated a harder installation and was surprised it was so easy. I bought the vehicle used so it was not equipped from the factory with tow package. But the wiring is installed from the factory on all RX350’s just the module was missing. The factory part was $150.00 and to have the dealer install it would be $1,500.00 with trailer hitch or $550.00 + part $150.00 if you have a hitch I installed. E-trailers part was [less than the original dealer part] including shipping with price and easy installation I highly recommend this product. 695684



- 118255
by:
2011 Lexus RX 350

As other reviewers have stated, installation of this kit (on a 2011 RX 350) is a breeze, could be done by a below average 12-year old in roughly the same time it would take to check your tire pressures.. Looks to be high quality, and, yes, it works as it should. So grateful that [vehicle dealer] incorporated the connectors in the wiring harness, and further grateful that I could obtain a reasonably priced aftermarket kit to complete the set-up. 693174



- 118255
by:

This was the third hitch and wiring harness I purchased from etrailer. Reasonable pricing, quick delivery and high quality equipment. I installed the hitch and wiring kit on my 2016 Lexus in less than an hour. A battery powered impact wrench makes quick work of the hitch mounting bolts. 692129



- 118255
by:
2015 Lexus RX 350

2015 RX350 without trailer towing package. Worked perfectly. The plug to use on the vehicle was hidden from view. I had to reach back in the compartment on the passenger side toward the tail light. It was not plugged into anything. (White plug to white plug.) That was the hardest part which wasn't hard at all. After connecting the gray plug (gray plug to gray plug) under the vehicle toward the rear opening in the undercarriage moulding on the drivers side, I tested the lights and the all worked. Highly recommend this product. 688478



- 118255
by:
2017 Lexus RX 350

Great Products! I am an Engineer and can be critical at times. I installed both the hitch and the wiring by myself without a lift in less than 45 min. Everything worked perfectly right out of the box. Great experience!! 677541



- 118255
by:
2015 Lexus RX 350

Needs updated instructions on how to install for 2019 Model. I figured it out since I've installed it on 2015 model before but the trim removal is slightly different. Otherwise easy plug and play installation. 673438



- 118255
by:

Very pleased with this item. I was able to connect the unit to my cars connectors and have the trailer lights working in less than ten minutes. Everything is working great. 670655



- 118255
by:

Works well. Instructions Sparce. 661717



- 118255
by:

Great product. Hitch and electric attachment worked great. Easy install. Clear instructions, prompt delivery. 661628



- 118255
by:

Super easy installation, and looks nice also. My dealer wanted $900 to do it, I was able to do it for less then a third of that. 658428



- 118255
by:

Everything worked exactly as the video demonstrated. Could not have been easier. 657645



- 118255
by:
2014 Lexus RX 350

Hitch fit perfectly on my 2014 RX350. It was easy to install after watching the installation videos which they had for my specific vehicle. No rattles, no missing parts and easy to follow instructions. My car tows beautifully and the hitch is the perfect height for the trainer I tow, although I usually use it for a bike carrier. Highly recommend etrailer! 654442



- 118255
by:

Perfect fit, no fuss, easy to install after watching the video 652971



- 118255
by:
2013 Lexus RX 350

Delivered extremely fast. Wiring and hitch installed just as shown in your videos. Great experience. 635482



- 118255
by:

As previously reviewed ....... now after one year.... still excellent product.... works perfect and I love it. Keep contacts lubricated........... Thank you............ 635179



- 118255
by:

Fit as factory at a fraction of the cost. What more can be said...... 619212



- 118255
by:
2015 Lexus RX 350

The wiring kit for my wife's Lexus was a great product; fairly priced and quality construction. The instructions for installation were inadequate. I found this a bit surprising since the instructions for installing the hitch were excellent by comparison. 612432



- 118255
by:
Lexus

Thanks Brenden C for informing me on what was needed to get my trailer lights working on our Lexus. A while ago I purchased the plug n play wire harness not realizing I needed the Power converter as well, my fault. When I spoke to Brenden, he knew what was needed and shipped the new wire kit " 118255". The previous wire harness I originally purchased worked flawlessly with the new power converter, so it took only 5 minutes to install and check. Thanks Greg 605033



- 118255
by:
Lexus

I must say all the people who helped me get the wright product (wiring) for my Lexus were great . They followed up wright to the delivery date to make sure I received my product . Great service great prices keep up the great work . 595697



- 118255
by:
Lexus

The product worked perfectly, thanks to the good advice from the E trailer expert, and the excellent video. Save me hundreds of dollars over taking my car to Lexus. Thank you very much etrailer. 575018



- 118255
by:
2013 Lexus RX 350

Still working great after a lot of use. No problems whatsoever 560112



- 118255
by:
2015 Lexus RX 450h

Product is fine. Easy install on my 2015 Lexus RX450h that did NOT have a pre-installed tow package. The wires/connections are where they were described. Be sure you can access the connection under the car—the ‘dust cover’ cap that must be removed does not look like a dust cover. Priority mail is supposed to be 2-3 days. It took 5 (and I needed the lights on day 4). 554016



- 118255
by:

This wiring kit was easy to install and works perfectly. The instructions were well illustrated and easy to follow. 553079



- 118255
by:
2012 Lexus RX 450h

Very happy with the product and the instructional video was a great help. This was by far one of the easiest installs!! Would highly recommend this product and web site!! :) 548766



- 118255
by:
2015 Lexus RX 350

Excellent, Your service and availability for help via phone call was well received. Thank you very much! 547935



- 118255
by:
2015 Lexus RX 350

I am a lousy do-it-yourselfer and these types of projects are the kind of thing I usually do not pursue. However, when I came across the #118255 Custom Trailer harness by Tekonsha and that it would work with my 2015 Lexus Rx350, I was taken in by the ease/simplicity of the installation. When I reviewed the simple instructions contained in the packaging, I proceeded with caution, again, thinking that this is too good to be true. Well, I couldn't believe how it all came together. Still skeptical, I withheld from completing the outside wiring until I put the trailer light tester to the test. Wow, everything checked out fantastic!!! I would recommend this to anyone looking to install this type of harness. 544141



- 118255
by:
2017 Lexus RX 350

Hardest part of install removing interior parts from trunk. Plug and play with a few zip ties and ready to go. 538779



- 118255
by:

This product fit my RX450h perfectly. Be advised that the instructions will not help you in removing the interior trim panels. I found some youtube videos to help me here. Also once I was finished I realized that it should be possible to install the T connector without removing any trim. Just remove the floor to the rear cargo bay and then reach in on the passenger side all the way aft. The connector that you need to access is stowed here. A mirror may be helpful in locating it. You should be able to plug in the T connector and then fix the control box to the car body. I used exterior grade double-sided tape for this. 528531



- 118255
by:
2016 Lexus RX 350

Hooked it up in less than an hour. Nothing to it..... 520738



- 118255
by:
2012 Lexus RX 450h

After coming to understanding that my 2012 RX450h does not come with a towing pkg features, I found this product on etrailer that assured me that this plug and play wiring will work. Package came in within 2 days, I plugged it in within 5 mins and had power to my trailer. Thank you for making it easy and affordable. 519180



- 118255
by:
2014 Lexus RX 350

The hitch is only part of the setup. The electrical connection for the trailer is equally important. This kit is plug and play into the car's wiring harness'. The cables are easily long enough and the build quality appears quite good. Very easy to install. 511536


Comments

I certainly am satisfied with the wiring, they work just fine as expected. Thanks.

Ralph S - 05/21/2019

55605

- 118255
by:
2012 Lexus RX 350

My order arrived in 3 days and works great. Very simple to install took less than 1 hour. Very satisfied. 506306



- 118255
by:

About 10 minutes total and wiring was done. Wonderful! 476153



- 118255
by:
2017 Lexus RX 350

Great product at a very competitive price. I installed it by myself in 40 minutes or so on our new Lexus RX-350. Would have been helpful to have a helper to lift and hold in place while fastening with the bolts provided. Looks great. 469797



- 118255
by:
2015 Lexus RX 450h

My hitch and wiring worked out very well. Very easy to install. I am very happy with it and etrailer. 455329



- 118255
by:

Arrived quickly, easy to install, worked perfectly. 449653



- 118255
by:
2015 Lexus RX 350

So I tried following the instructions and they were helpfully but not complete, eTrailer video is exactly how it should be installed. 444033



- 118255
by:

Great item, worked perfectly. Easy installation. etrailer is a great vendor. Good prices and fast delivery. 442628



- 118255
by:
2016 Lexus RX 350

thanks, your towing is good that was fix my 2016 Lexus RX 350 then very easy install and it work for my trailer. Thanks 436187



- 118255
by:
2014 Lexus RX 450h

Wire hook up for non factory tow wire hitch lighting kit,plugs right in to 10 pin vehicle harness on passenger side rear,perfect,good price,fast delivery,thanks etrailer. 431025



- 118255
by:
2015 Lexus RX 350

This custom wiring harness 118255 was perfect for my 2015 Lexus RX350. It plugged in as advertised and was very simple to install. The videos were a great help, so when it came time to do the install, it went smoothly. I highly recommend this to anyone needing trailer wiring for a vehicle without the tow package. No splicing required! Thank you etrailer!! 416684



- 118255
by:
2014 Lexus RX 350

on time , looks like good quality 398391



- 118255
by:
2014 Lexus RX 350

As advertised in all ways. Easy install. 396849



- 118255
by:

Product was high quality and delivered on time. Simple to installed and worked as advertised. Customer service (Donna) was great to work with. Overall a great customer experience. 382042


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  • The Curt Trailer Hitch Receiver part # C13143 is an excellent option for your 2015 Lexus RX 350 and will work well for you. It has a Class III rating with a 2" receiver tube opening. It also comes with a limited lifetime warranty. I have attached an install video of this hitch as well. I recommend using a hitch cover like part # C22272 to protect the inside of the receiver tube from rusting while not in use. For a trailer wiring harness, I recommend using the T-One Vehicle Wiring Harness...
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  • Trailer Hitch Recommendation for 2018 Lexus RX450H
  • I checked with Draw Tite and their hitch part # 75540 is confirmed as a fit for your 2018 Lexus RX 450H so it would work well for you. For trailer wiring you'd then want the part # 118255 which is a confirmed fit as well. 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 includes a 1-7/8 inch ball, 2 inch ball, hitch...
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  • Trailer Hitch and Wiring for a 2017 Lexus RX 350
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  • 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...
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  • For a 5-way trailer connector on your 2016 Lexus RX 350 you'll first need a 4-way. If the Lexus includes the tow package you can use # 118252 which will plug into a connector just under the rear bumper. If it does not have the tow package then # 118255 is what you'll need which has a 4-way that plugs into the same place, as well as a ModuLite power module that plugs behind a trim panel in the rear cargo area. Once you have a 4-way you can then use # 47515 which plugs into the 4-way...
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  • Recommended Trailer Hitch and Wiring For 2017 Lexus RX-350
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  • Best Trailer Wiring Harness for a 2015 Lexus RX 350
  • The 2015 Lexus RX350 could have come with a factory tow package meaning that it would be prewired for a trailer wiring harness which is what that other company that isn't nearly as awesome as us is saying. Models that do not have the factory tow package need an additional piece of equipment which is what the dealer is saying. I am assuming the dealer would know whether or not the vehicle came with the factory tow package. If it did not then that extra piece of equipment is indeed a...
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  • Complete Towing Setup for 2018 Lexus RX 350 Including Hitch, Wiring and Brake Controller
  • I'm happy to help you get your RX 350 ready for pulling your new camping trailer and I wish you many good times in the future. Starting with a hitch, I recommend the USA-made Curt Class III hitch # C13272 for its simple no-drill installation (it includes all the hardware) and for its substantial 4000-lb towing capacity. It installs as shown in the written instructions and installation video, both of which are linked for reference. I also suggest ball mount kit # 989900 which provides...
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  • Trailer Hitch and Wiring Recommendation for 2015 Lexus RX 350 F-Sport
  • Yes, for your 2015 Lexus RX 350 F-Sport without the factory tow package the correct trailer wiring harness you'll need is the Tekonsha kit part # 118255 which will give you a 4-way. This will work great with the Curt hitch part # C13143 you plan to install as well. 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 includes...
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    view full answer...

  • Recommended Trailer Hitch Receiver for 2017 Lexus RX350
  • For your 2017 Lexus RX350, I recommend the Curt # C13272 over the Draw-Tite # 75540. The reasoning is only based on the rated load capacity. Both hitch receivers have a strong tongue weight but the Curt hitch offers a greater towing capacity when utilizing weight distribution if you will be towing. For your tow wiring, I recommend # 118255. This is custom designed to fit your vehicle without splicing into the factory wires. You just plug it in and you are ready to go. This harness...
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  • Parts Needed to Install Brake Controller in 2015 Lexus RX 350
  • You will need to start with a 4-way (if you do not have one). For that you would want the # 118255. 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. I attached an install video for this on a somewhat similar Toyota SUV, but we have not had the chance to install...
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  • Trailer Wiring Recommendation for 2017 Lexus RX 350 without Tow Package
  • While we don't have an install video yet for the Tekonsha trailer wiring harness part # 118255 which fits your 2017 Lexus RX350. I did attach a picture that covers the install with pictures where you'll find the harness. An additional wire needs to be ran to the vehicle battery as well. I attached a help article that covers how to do that too.
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  • How to install the T-One Vehicle Harness with 4-Pole Flat Trailer Connector 118255
  • I attached a set of install instructions for the trailer wiring harness part # 118255 that you referenced below. In it you'll see a guide that will walk you through the process with pictures as well.
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  • Trailer Wiring Recommendation for 2017 Lexus RX 350 without Tow Package
  • Since Lexus wanted to sell you a trailer wiring harness that includes a converter that would mean that your vehicle does not have the tow package. So for a wiring kit you would want the part # 118255 which is a confirmed fit for your vehicle and does have a converter.
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  • Why Would Known Working Trailer Lighting Not Work with Functioning Vehicle Trailer Harness
  • The T-One harness part # 118255 that you installed taps in to the trailer wiring circuits of your 2013 Lexus RX 350. Most likely what is happening is that your trailer wiring circuits on your vehicle can't handle the amperage load of your trailer's lighting. Is there a significant number of lights on your trailer that are incandescent? Typically in those situations we have to recommend converting to LED lights. I attached a link to our page that has all of the LED trailer lights we offer...
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  • Wiring Harness Options for a 2014 Lexus RX450h
  • Yes, that is consistent for your 2014 Lexus RX 450h as well. I checked the online owner's manual for your vehicle and the fuse locations were the same. You can verify this with your copy of the owner's manual as well. I found the fuse location charts started on page 694. If you do have the factory tow package then part # 118252 is what you are needing. If you do not have the factory tow package then the T-One # 118255 is what you need instead. This has the same wiring harness for the...
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  • Best Trailer Hitch Recommendation for a 2013 Lexus RX 350
  • All of the hitches available for your 2013 Lexus RX 350 are pretty similar. The biggest difference is that the Curt Hitch part # C13143 can fit the F Sport and non-F Sport models. Because of that I would recommend the Curt hitch. The trailer wiring available for your vehicle, part # 56083, is only available for the models of the vehicle that have the factory tow package. Without the factory tow package use # 118255. I attached videos for you to check out as well.
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  • Which Trailer Hitch is the Least Noticeable on a 2017 Lexus RX 350
  • Curt trailer hitch # C13272 and Draw-Tite trailer hitch # 75540 will be in identical locations once installed so in terms of the snuggest and least noticeable fit neither hitch has the advantage. They both cost about the same as well so really either hitch is a great choice. The Curt hitch is the more popular option. I have linked videos showing example installations of both hitches for you. If you plan on doing some towing I recommend etrailer ball mount kit # 989900. It comes with...
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  • Recommended Trailer Hitch and Wiring for 2018 Lexus RX 350
  • To tow a trailer with your 2018 Lexus RX 350 you will need to add a trailer hitch, a wiring harness, and ball mount/hitch ball combo. Starting with the trailer hitch I highly recommend the Draw-Tite Class III # 75540 because it offers the highest capacities (4,500 pound towing and 675 pound tongue weight) and features a sleek hidden crosstube design where only the 2 inch receiver is visible behind the vehicle. This allows for a sharp OEM appearance on your Lexus (see attached image)....
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  • Trailer Hitch Recommendation for 2018 Lexus RX 450H
  • The Draw Tite part # 75540 is the best option for a trailer hitch for your 2018 Lexus RX 450H. It's a confirmed fit, it has a 2 inch hitch opening (the preferred and most popular size), it has great towing capacities, and the best price. I attached an install video for this for you to check out as well. For trailer wiring you'd then want the part # 118255 which is a confirmed fit. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes...
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  • Everything Needed to Tow a Trailer with a 2017 Lexus RX 450h
  • For just the electrical side of things for your 2017 Lexus RX 450h we have the Tekonsha T-One # 118252 if you have the factory tow package or the T-One # 118255 if you don't have the factory tow package. Either of these gives you a 4-Way for the basic trailer light functions. One you have installed the T-One harness the next step is to install a 7-Way. For this we have the Universal Installation Kit # ETBC7. This includes everything that you need for a fully functioning 7-Way and a brake...
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  • Installing Tekonsha Trailer Wiring Options for a 2015 Lexus RX 350
  • If you are talking about the Tekonsha T-One # 118255 for your 2015 Lexus RX 350 then no, you will not need to run a separate wire to the battery for power. This is a simple plug-in option that does not require any splicing. If, however, you were talking about the Tekonsha ZCI # 119250KIT then yes, you will need to run the included Black wire up to the battery for power. I have attached a video of this process being done on a 2015 BMW X5 that you can use as a reference. Installation...
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  • Does Draw Tite Hitch # 75540 Fit 2016 Lexues RX350
  • Yes, the Draw Tite hitch part # 75540 that you referenced is a confirmed fit for your 2017 Lexus RX350. We have confirmed this with Draw Tite and we had the chance to install this on a 2017 model as well. Check out the install video I attached below for more info as well. For trailer wiring you'd then want the part # 118255 which is a custom fit. 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...
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  • Trailer Wiring Harness # 118255 Does Not Fit a 2018 Lexus RX350L
  • I checked with the manufacturer for wiring harness # 118255 and they still show it as a fit for the 2018 Lexus RX 350L so I am not sure why your connectors do not match up. The only thing I can think of is that for the 2018 model year it might only fit models with the factory tow package. This is the only plug-in type of wiring harness for your vehicle; everything else is a hardwire such as # 119147KIT. The hardwire options require splicing into the vehicle wiring with the exception...
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  • Recommended Trailer Harness Bracket For 2015 Lexus RX 350
  • The Curt Trailer Hitch # C13143 is confirmed as a fit for your 2015 RX 350. This hitch has a 2-inch receiver opening. The # 118252 wiring harness will work well for you if your Lexus has a factory tow package. If you do not have the factory tow package you will need part # 118255. There are a couple ways you can attach the 4-way trailer connector. You can use a bracket like part # 18144 which screws and nuts needed for installation. You can go the no-drill route by using either...
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  • Installation of Tow Ready T-One Vehicle Wiring Harness 4-pole # 118255 on a 2012 Lexus RX450H
  • To install the Tow Ready T-One Vehicle Wiring Harness 4-pole # 118255 on a your 2012 Lexus RX 450H, the white plug that has a small black box attached to it plugs in to the vehicle wiring harness. This attachment point is located in the rear cargo area of your vehicle, and is on the passengers side. Then the gray plug that has the trailer 4-pole at one end will plug into the connection point underneath your vehicle. There is also a 10 amp mini-fuse included in this kit and that will have...
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  • Recommended Trailer Hitch and Trailer Wiring Harness for 2012 Lexus RX450h
  • A Lexus dealer should be able to tell you how the vehicle's equipped if you provided them with the VIN. You can also determine this for yourself using a circuit tester like part # 40376 on the trailer wiring connector located behind the bumper under the drivers side of the vehicle at the rear (see provided photo). Have a helper activate each turn signal function as you probe the pins in the connector under the vehicle. If the plug is active, all you'll need is the # 118252. If it's not...
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Info for this part was:

Expert Research:
Michael H
Expert Research:
Reno H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Rachael H
Installed by:
Jeff D
Video by:
Kathleen M
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Isabelle B
Test Fit:
Randy B
Video Edited:
Chris R

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