/
Tekonsha/
Custom Fit/
Trailer Hitch Wiring/
4 Flat/
Powered ConverterItem # 118255
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Our Price: $37.95
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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.
Features:
Specs:
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.
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.
Installation Details 
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.
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.
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.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
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
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
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
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
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 - 01/06/2016Installation was very straight forward. Highly recommend. 697837
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
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
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
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
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
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
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
Works well. Instructions Sparce. 661717
Great product. Hitch and electric attachment worked great. Easy install. Clear instructions, prompt delivery. 661628
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
Everything worked exactly as the video demonstrated. Could not have been easier. 657645
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
Perfect fit, no fuss, easy to install after watching the video 652971
Delivered extremely fast. Wiring and hitch installed just as shown in your videos. Great experience. 635482
As previously reviewed ....... now after one year.... still excellent product.... works perfect and I love it. Keep contacts lubricated........... Thank you............ 635179
Fit as factory at a fraction of the cost. What more can be said...... 619212
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
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
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
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
Still working great after a lot of use. No problems whatsoever 560112
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
This wiring kit was easy to install and works perfectly. The instructions were well illustrated and easy to follow. 553079
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
Excellent, Your service and availability for help via phone call was well received. Thank you very much! 547935
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
Hardest part of install removing interior parts from trunk. Plug and play with a few zip ties and ready to go. 538779
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
Hooked it up in less than an hour. Nothing to it..... 520738
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
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
I certainly am satisfied with the wiring, they work just fine as expected. Thanks.
Ralph S - 05/21/2019My order arrived in 3 days and works great. Very simple to install took less than 1 hour. Very satisfied. 506306
About 10 minutes total and wiring was done. Wonderful! 476153
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
My hitch and wiring worked out very well. Very easy to install. I am very happy with it and etrailer. 455329
Arrived quickly, easy to install, worked perfectly. 449653
So I tried following the instructions and they were helpfully but not complete, eTrailer video is exactly how it should be installed. 444033
Great item, worked perfectly. Easy installation. etrailer is a great vendor. Good prices and fast delivery. 442628
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
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
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
on time , looks like good quality 398391
As advertised in all ways. Easy install. 396849
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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