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FITS 2017 Lexus RX 350
Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

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

Item # 56083
Our Price: $19.40
You Save: 56%
Custom Fit Vehicle Wiring
Confirmed to Fit
2017 Lexus RX 350

with factory Tow Package

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To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Shipping Weight: 0.5 lbs
In Stock
CURT Trailer Hitch Wiring - 56083
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Call at 1-636-238-5930 for expert service. We are your Lexus custom fit vehicle wiring experts, and offer a great price. carries a complete line of CURT products for your Lexus RX 350 2017. Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector part 56083 from CURT can be ordered online at Complete custom fit vehicle wiring installation instructions and technical support.
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2017 Lexus RX 350 - Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • CURT

Quickly and easily install a 4-way trailer connector on your Lexus RX 350 with this custom harness. Connector plugs directly into OEM tow package port - no cutting, splicing or tapping required.


  • 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
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's factory tow package wiring harness, which is located behind the rear bumper, along the driver's-side frame rail.

Once installation is complete, the 4-way 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.

56083 CURT T-Connector - OE Replacement 4-Flat

Installation Details 56083 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - 56083

Average Customer Rating:  4.9 out of 5 stars   (352 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package port - no cutting, splicing or tapping required.


The trailer hitch is an excellent product, well made & easy to install. I give it a 5 star rating. The wiring harness also was good quality
and worked well.

2015 LexusRX 350

Shipping was prompt and extremely well packaged. I received timely updates on the progress of my order (which was much appreciated as I needed this an upcoming trip). Both the recommended hitch and wiring harness were a perfect fit. The installation video and PDF were informative and accurate, making the installation stress free and within the estimated timeframe. One hint: if working alone, a floor jack to support the hitch works as well as another set of hands.

This was my second order from E-trailer. Their products and support are excellent.


Hitch fit perfectly and instructions were clear. It would be nice if there were a method for stowing the wiring harness connector out of sight.

2019 LexusRX 350

you guys did a great job. you got me exactly what i asked for and got it out quick. the trailer hitch is actually much better than i was expecting. it is very heavy duty and mounts to the vehicle with 6 bolts instead of just 4 bolts like other manufacturers hitches do. i can't wait to install it and tow something lol. once again thanks for the great job and nice product

2018 LexusRX 350

Fit perfectly on our Lexus RX 350 and there was plenty of length to allow you to route the wiring harness any way you choose. The video series etrailer puts together on how to install the time is wonderful and very helpful, especially for those who learn by watching someone do the install first.


Super easy installation. Great guidance on parts that fit your tow vehicle.

2019 LexusRX 350

Easy installation and circuit testing. Thank you for the follow up

2019 LexusRX 350

Haven't installed yet, but have been buying from etrailer for 20 years. Never a problem with their products.

2015 LexusRX 350

As easy as all the reviews said it would be. Took a little while to get new bolts started that replaced OE self-tapping bolts. But it all lined up and gave a professional finished look when completed. Now I'm ready to help my friend install the hitch on his wife's RX. Won't hesitate to recommend to all in the future.

2014 LexusRX 350

Very easy install and great fit for my 2014 Lexus RX. I’ve had it a little over a year.

2010 Lexus RX 450h

Literally cannot get simpler to install than this. Luckily, my 2010 Lexus Rx450H was set up with the factory tow package (and luckily I kept the window sticker to verify that!), so once the trim panel below the bumper is removed, the electrical connection is on the driver's side frame rail, capped. Remove cap, plug in the wiring harness, zip tie to the cross bar of the hitch, you're done. Shipping was super fast--ordered on Wednesday 6-14-17, scheduled for arrival 6-19-17, arrived late morning 6-17-17. Thank you!

I'm using it to tow troop equipment and canoe trailers for my son's Boy Scout events.


Fits perfectly ... installed in less than an hour with a second set of hands from my son. And the genesis that snapped right in to the prewired rx350 tow wiring package .... all at 1/3 of the price the Lexus dealer was going to charge !!


Great product, excellent support. Very easy install in 25 minutes. Install directions very good. Holes are slotted in hitch, would recommend starting all bolts leaving bolts loose, then center hitch by bumping with wooden block before tightening. Then torque to spec.


Everything worked as it should. Easy in stall.

LexusRX 350

I purchased this harness a year ago and installed it with relative ease. The wire had plenty of length for my vehicle (Lexus RX 350) and the connection was simple. The product works very well, I am satisfied and would recommend to others with a similar need.

Another year gone by and everything works perfectly. I appreciate the opportunity to provide follow-up to my review, good for yall. If youre like me, I hate basing my purchases only on new reviews.
Andrew - 10/08/2022

2019 LexusRX 350

Snapped right on and came with everything needed to secure it to vehicle.


Extremely dissatisfied, disappointed. Shipped me wrong hitch I assumed it was the correct hitch and paid a subcontractor to install in 2 hours into installation we discovered it was the wrong hitch. On top of that the customer service guy says there is no after market hitch and he can only refund my money.
Zero accountability and nothing more than a refund.
No apologies no additional money or store credit, nothing.
I’m very angry and disappointed with etrailer!
Hopefully some upper management will read this and contact me to make it “right”.


The trailer light wiring I originally ordered was on back order so they let me know that a similar item was in stock. I revised the order and the trailer hitch and wiring light arrived promptly.

2013 LexusRX 350

Super easy to install especially if you have the tow prep package on your car. The bracket makes the look more professional.

2022 LexusRX 350

Perfect if!!! So easy to install!!!! Hardest part of install was getting the factory cap off to install the wiring. Can’t wait to use it!!!!


Perfect fitment and function as adverti sed.

DAVID L - 04/23/2023


Easy Plug and play

2013 LexusRX 350

All I can say is, thanks etrailer for having the right product for the Job!! Product as advertised! Installation was a breeze taking only 45 minutes. I did the installation without raising the vehicle up off the ground. As a side note, the Lexus dealer wanted over $700 for doing the same job, no surprise there..


The product was exactly as advertised and we received it earlier than expected !

2021 LexusRX 350

WOW. Fast shipping and packaged well. Great video to assist if needed. I made a call to verify that it fit my car. Very quick phone pick-up. Very pleasant and helpful.
The hitch is barely noticeable.
I give this place a 10.

Show More Reviews

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

  • Where to Plug in the 2011 RX 350 Trailer Hitch Wiring Harness # 56083
    Yes, I have a photo that shows where to plug in the Curt Custom Fit Vehicle Wiring, item # 56083, on your 2011 Lexus RX350. The photo to the right shows the connector with the cap that is installed from the factory. Once the cap is removed, you will carefully plug in the connector from the wiring harness. I have also included a link to instructions for you to view.
    view full answer...
    Image 1 for
  • Curt T-Connector Vehicle Wiring Harness w/ 4 Pole Connector, part # 56083
    Yes, the Curt T-Connector Vehicle Wiring Harness with 4-Pole Connector, part # 56083, comes with installation instructions for your 2010 Lexus RX350. This wiring harness simply plugs into the factory connectors on your Lexus.
    view full answer...
  • How to Install T-Connector on 2010 Lexus RX350
    Part # 56083 is called a T-connector because it connects into wires that run between the tail-lights. The connection point on the vehicle will only work if your 2010 Lexus RX350 came with the factory tow-package.
    view full answer...
  • Troubleshooting Malfunctioning Trailer Wiring Harness on 2013 Lexus RX350
    I'm assuming you have a 2013 Lexus RX350. Did the # 56083 wiring harness ever work, or did it work for awhile and then stop? From my research, the connector should work once plugged into the factory towing connector under the vehicle, unless your vehicle isn't equipped with the tow package. If the tow package wasn't purchased, you'll need to add the fuses or relays to activate the tow package. I'd recommend you check your owner's manual or with Lexus, as I was unable to access an online...
    view full answer...
  • Trailer Lights Not Working After Installing Wiring Harness on a 2015 Lexus RX 350
    First, the trailer wiring harness # 56083 is only a fit if your 2015 Lexus RX 350 came with the factory tow package. If it did not then that could be why it isn't working. Or, if it does have the factory tow package, it could be a missing fuse or relay which you could find in the under hood fuse panel or the in cab fuse panel.
    view full answer...
  • 2015 Lexus RX 350 Trailer Hitch and Wiring Fit Recommendation
    The Curt hitch part # C13143 is a confirmed fit for your 2012 Lexus 450h. This will be a great choice for a hitch. For the amount of salt you are going to get in the winter in Wisconsin there really is no way to totally stop all rust. But what you can do is make sure to spray off the salt as often as possible on the hitch, and if you see a scratch in the paint of the hitch use spray paint to paint over it before rust develops. Also if you find rust try to sand it off as quick as possible...
    view full answer...
  • Trailer Wiring Harness for a 2017 Lexus RX 350 with Towing Prep Package
    The trailer wiring harness for the 2017 Lexus RX 350 is # 56083. It actually fits several years of the RX 350 including the 2017. I have linked a video showing an example installation for you.
    view full answer...
  • Trailer Wiring Harness Recommendation for 2017 Lexus RX 350 with Towing Package
    For a 4-way trailer wiring harness for your 2017 Lexus RX350 that has the tow package you would want the part # 56083 which is a confirmed fit. This harness does not have a converter box built into it and it just plugs right into a port you have at the rear of your vehicle. I attached an install video for more info for you to check out as well.
    view full answer...
    Image 1 for
  • Troubleshooting Installation of Curt T-Connector Vehicle Wiring Harness on 2012 Lexus RX 350
    One possibility is that your 2012 Lexus RX 350 may not be equipped with an active tow package. The plug may be there but the necessary connections may be missing. I recommend checking with your local Lexus dealer to determine what is needed to activate the towing package. Some vehicles will need to be reprogrammed at a dealership to allow this wiring harness to work.
    view full answer...
  • Will Trailer Wiring harness 56083 Fit a 2013 Lexus RX 350 without Factory Tow Package
    Curt trailer wiring harness # 56083 is designed to fit a 2013 Lexus RX 350 that came with the factory tow package. The dealer is likely correct, additional parts could possibly be needed to activate the tow package wiring. You could try to place a fuse and that may be all it needs. Its certainly worth trying. All you have to do is check the fuse panel lids (there is usually one in the cab of the vehicle and another under the hood or possibly in the cargo area of the vehicle) for the tow...
    view full answer...
  • Troubleshooting No Power to 4-Way on 2014 Lexus RX 350 After Curt Harness 56083 Install
    The only way to know for certain is to contact at Lexus dealer with your VIN to determine if you have the tow package. Sounds like you are missing some relays or fuses under the hood of your 2014 Lexus RX 350 that will allow the trailer wiring harness to be active. There is a tech note for this harness that it may require additional components such as relays or fuses depending on how the vehicle is equipped.
    view full answer...
  • Will the Curt Trailer Wiring Harness 56083 Fit a 2016 Lexus RX 350 without Tow Package
    If you tested the port on your 2016 Lexus RX 350 for trailer wiring and the pins have voltage then the Curt Harness part # 56083 will fit and work well. We have found that there are several vehicles that even if they do not have the tow package the wiring is still ran and functional. I attached an install video for this harness for you to check out as well.
    view full answer...
  • Location of Trailer Tow Package Connector on 2015 Lexus RX350
    The connector that the Curt # 56083 trailer wiring harness plugs into is located right behind the bumper on the driver's side rear corner of the vehicle as shown in the linked video and in the provided photo. There might be a underside cover that needs to be removed to access the connector as shown in the video.
    view full answer...
  • Troubleshooting Trailer Wiring Connection on 2015 Lexux RX450h
    For your 2015 Lexus RX 450h the Curt T-Connector # 56083 should not need a fuse in the trailer battery slot. You should instead only need fuses in location #21 in the cabin fuse box to power the trailer tail light converter and #44 in the under hood fuse box to power your trailer lights.
    view full answer...
  • Recommended Trailer Wiring Harness for 2022 Lexus RX 350 with Factory Tow Package
    The Curt T-Connector Vehicle Wiring Harness part # 56083 is correct for a 2022 Lexus RX 350 with factory tow package. It's a plug-in harness that does not require any splicing for installation. The plug you will need to locate to use this harness is located behind the rear bumper cover on the driver side. It provides a 4-way flat which is the most common type of connector and used on most trailers for this vehicle. I have attached an install video below on an earlier model but it will...
    view full answer...
  • Curt Trailer Wiring for 2019 Lexus RX350 Tow Package
    Yes, since you were able to find the trailer wiring connector under the rear of your 2019 Lexus RX 350 that would indicate that it has the factory tow package and that the trailer wiring kits like the Curt part # 56083 would be the correct solution to add trailer wiring.
    view full answer...
  • 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.
    view full answer...
    Image 1 for
  • No Lights On Trailer When Using Curt Wiring Harness # 56083 On 2010 Lexus RX350 Without Tow Package
    On your 2010 Lexus RX350 without a tow package, you would need to use Tow Ready Custom Fit Vehicle Wiring, # 118478. I have included a link to the installation details below. This harness includes a circuit protected converter and requires a direct connection to the battery. This connection to the battery virtually eliminates power draw from the vehicles taillights, which protects the sensitive wiring. The Curt T-Connector Vehicle Wiring Harness with 4 Pole Connector, part # 56083 is for...
    view full answer...
  • Availability of a Trailer Wiring Harness for a FWD 2010 Lexus RX 350
    Yes, we have seen this situation, from the research I have done the FWD model of the 2010 Lexus RX350 does not come with tow package wiring that can be utilized with the Curt # 56083 wiring, unless the vehicle has this wiring from the factory. So for the FWD vehicle this is a replacement part only. For your FWD model without the wiring harness from the factory, you will need the Tow Ready Custom Fit Vehicle Wiring, item # 118478, to set your vehicle up with a 4-Way trailer wiring connector....
    view full answer...
  • Correct Trailer Wiring For My 2010 Lexus RX350 With Factory Tow Package
    There is a possibility of 2 different problems. The first is that if you have the front wheel drive model RX350 and the factory tow package, then the Curt Custom Fit Vehicle Wiring, part # 56083 is not compatible with your 2010 Lexus RX350. The other possibility is that the plug that you found on your 2010 Lexus RX350 still has the protective cover on the plug. If this is the case, you will just need to remove the protective cover and part # 56083 will plug right in. If you have a front...
    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
  • Trailer Wiring Harness for a 2010 Lexus RX 350 without Factory Tow Package
    If you did not order the tow package for your 2010 Lexus RX 350, then you will need to use wiring harness # 118478. The connection point for the tow package harness may be present but there are other components and wiring that needs to be done to make it fully functional from the factory. You can always have a dealership run the VIN of the vehicle to determine what options it has. I have included a link to the installation details for the 118478 wiring harness for you to view. I have...
    view full answer...
  • Trailer Wiring Harness Installation Location on a 2010 Lexus RX 350 with Factory Tow Package
    The connection point for trailer wiring harness # 56083 is located behind the rear bumper, on the driver side. I have included a picture and a link to the instructions that show this for you. That connection point may be there even if the vehicle does not have the factory tow package. The easiest way to determine how the vehicle is equipped is to call a dealer service department and have them run the VIN through their system. They can tell you if you have the tow package or not. If you...
    view full answer...
    Image 1 for
  • 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

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Condition: Like New

Notes: May have damaged packaging or minor cosmetic blemishes.

Our Price: $17.95
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