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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118801
Our Price: $73.16
You Save: 23%
Custom Fit Vehicle Wiring

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Shipping Weight: 1.68 lbs
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118801 - Powered 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 existing wiring. Powered ModuLite reduces strain on wiring system. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118801 or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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Tekonsha Custom Fit Vehicle Wiring - 118801

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • Tekonsha

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily
    • Locate connection points in rear cargo area
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side tail lights. You will have to remove the rear threshold plate, privacy screen, storage covers, floor covering, and rear interior trim panels to access this harness.

Once you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.

Once installation is complete, the 4-way flat connector will be stowed in your rear 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 Powered Tail Light Converter

A ModuLite power module is built into this T-One connector. Because most trailers run on a two-wire system - wherein the brake and turn signals are carried on one wire - the separate brake and turn signals from your vehicle's three-wire system need to be combined so they are compatible with the wiring system of your trailer. This power module functions as a tail light converter to combine the brake and turn signal functions of your automobile so that they run on one wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.

118801 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118801 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118801

Average Customer Rating:  4.8 out of 5 stars   (376 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into existing wiring. Powered ModuLite reduces strain on wiring system.

2020 Toyota RAV4

Great quality and sound design. Package arrived looking like it had been air-dropped, but the hitch only had a few scuffs on the paint, and the harness package was unharmed. I watched the [online] video a few times and read and reread the printed instructions. All were very helpful.



Hitch is doing great! I do not actually pull a trailer, but have a cargo carrier that plugs into the trailer hitch in which I transport my 15 scale railroad flat car.


The sales representative was amazing. Not only did he care about providing AAA services but also sent video's on how to install which made it so easy. I will definitely purchase through etrailer again.


etrailer has always been easy to work with. Their customer service and support is exceptional. There products are also very useful. I will continue to purchase from them in the near future. Thank you for all your help and support during the purchase process.

2022 Toyota RAV4

I never thought I would be able to attach a trailer hitch and then put the wiring in. We recently bought a new car and we wanted a trailer hitch put on. The dealer wanted over $600. I believe I paid under $250 for the hitch and wiring harness. The videos are fantastic. It is step by step. Unless you are disabled, you should be able to do it. If you are shopping around you don't need to go any further. Customer service is A+. I never take the time to write reviews, but i just wanted to let others know what a good experience I had and saved over $350.



It is great

2019 Toyota RAV4

Quick ship. Just what I needed to get the wiring done without cutting into the existing wiring harness on the vehicle.

Dj Z.


Used it just this weekend. Worked great!

2019 Toyota RAV4

Hitch and lighting kit installed fine, but the videos didn’t mention differences in the 2019 RAV 4 Hybrid from the non-hybrid. I wanted to let you know about those.

Not sure if this is solely a hybrid issue, but there was what was either a shipping tie-down or tow point bracket that required permanent removal, as it was right in the way of the hitch cross member. It’s quite heavy duty. Comes off easily, requires removal of two bolts. Passengers side, mounted on the bottom of the frame rail. I have included a photo, but not while it was on the car, I was focused on the install. I managed the install by myself, no lift, required jacking up at the rear jack point on one side to be able to slip the hitch up behind the chrome exhaust tips, as the distance between them is less than the width of the hitch. Also, appears the foot activated rear hatch auto lift will not work with the hitch, which is what Toyota said, but not what e-trailer said when I sent in the question prior to purchase. It would not have made a difference in my decision to buy. See attached photo

Very pleasant surprise, the battery on the hybrid is in the rear, passengers side below the passenger side panel. Running the power cable is a breeze. The battery is accessed by two removable panels, but just as in the video, I felt more comfortable nearly removing the large side panel to access the light connector. Also, I have the premium stereo, which as a woofer in the drivers rear panel. This does not cause any problems, but is worth mentioning to potential installers so they don’t get worried.

Jerry V.


Well, I have hUled a trailer a few times, use the receiver for a hitch mount bike rack frequently. Light co be toe kit and instructions were excellent!

Toyota RAV4

This was the easiest hitch I have installed. Just 4 bolts going into the existing nuts in unibody of my 2021 RAV4.



Still working great!


It just a wiring harness that worked as intended.


Excellent instructions and reasonably priced. In the end, I decided to pay a shop to install because I was too lazy to pull all the interior panels to route the wires. The shop would've provided a similar control unit and would've marked up substantially. Shop had no issue installing my customer-provided kit. Controlling my trailer lights perfectly.

2021 Toyota RAV4

Easy Peasy. Took me about 30 mins to install hitch on the new Rave Hybrid. Didn't even jack up the vehicle. Car was shiney new so exhaust hangers slid right off. Supported muffler w a stack of 2X4s. Removed access stickers and slid the hitch in place. Shimmed it up with more scrap 2x4 pieces. I have limited tools here at the winter house in Myrtle Beach, but 19mm box end got er done! Slid exhaust hangers back on, good to go. Wiring harness will have to wait a few weeks. Very happy, will use next week to drive to Dallas with Bike carrier on the back.


Very affordable. Shipped quickly. Correct fit. Inexpensive to install.



The wiring harness works very well. I have some mobility issues so had to pay for some help installing it but by following the instructions that came with the unit we were able to hide the cabling and it out of the vehicle exactly it needed to be for best use. It works every time and its easy to connect.

Etrailer Expert

Mike L.


@Tommy That's great! We're so glad to hear that!

2019 Toyota RAV4

The installation video for my make and model vehicle was a great help. It gave me the confidence to pull a little harder on the interior plastic side panels knowing they would not break. Wire harness connectors fit perfectly with existing connectors. My hybrid vehicle has the 12v battery located in the rear on passenger side. This made the power connection a breeze. I will recommend Etrailer to anyone looking for your type of products.



Trailer lights work perfectly each and every time.


Not much to say, working well, installation was relatively easy

2019 Toyota RAV4

This does not fit the 2019 RAV4 Hybrid for plug in installation. I got it so that I didn't have to splice the wires but ended up needing to splice them anyways.

Etrailer Expert

Mike L.


I checked with Tekonsha just to be sure, and they have indeed confirmed that this is the correct wiring harness for your 2019 Toyota RAV4. After taking a look at your photo, it appears you might be looking in the wrong spot for the connectors. The photo you provided shows a photo of a connector outside the vehicle, behind the taillight assembly. The correct connectors are actually located behind the interior panels on both sides of the cargo area as shown in the installation instructions linked above.


I installed the hitch apparatus and Light connector one year ago. Both pieces still look great and work flawlessly. I am in Florida and I see no signs of rust from the salt environment in my area.


From ordering to installation of the parts, was very easy to do.


Exactly what I needed. Everything went together perfectly and is working perfect. Ordered for a second SUV.





This trailer hitch impressed me. Unfortunately, we had an issue with [mechanic shop] and they did not connect the hitch on correctly which came disconnected. The emergency chains were hooked in and try to pull away the trailer, even slam back into the hitch, and there was very little damage to the actual hitch itself very impressed with the quality of this product.


Gives a flawless finish like an oem acc essory.


The install was just as described in the video. I was able to install the hitch by myself and the holes lined up perfectly with the hardware supplied. Thank you for a quality product.

2019 Toyota RAV4

Following the etrailer tutorial made this task very easy. The wiring was even easier in my 2019 Toyota RAV4 Hybrid XLE because my car's battery is located in the rear passenger side corner of the trunk. So for power, I didn't have to run the cable all the way up to the front end of the car. My only wish is that the butt splices weren't so cheap and they included heat shrink ones instead.


Easy install. The instructions for wire connections were accurate but watching the video on the item page helped the most, especially with removal of the interior trims.


Wiring and hitch has worked great. This is my third purchased for 2020 RAV 4, 2021 RAV 4 Prime and 2022 RAV 4 Prime.

Toyota RAV4

I had a local company do the install on my 2022 Rav4 Hybrid. So far so good. The system is working excellently!


Easy to install! Directions were spot o n.

Show More Reviews

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

  • Does Tekonsha Wiring Harness 118801 Fit 2021 Toyota RAV4
    Yes it's ok; the correct 4-way that fits your 2021 Toyota RAV4 is indeed the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118801.
    view full answer...
  • Does Curt Wiring Kit Fit a 2019 Toyota RAV4 Hybrid
    We actually have multiple reviews for the Curt # C56434 that state the customer installed it on a 2019 Toyota RAV4 Hybrid. The one review you are referring to looks like the customer was looking in the wrong spot which is why the connector they found didn't match up.
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  • Installing Curt Wiring Harness on 2019 Toyota RAV4 Hybrid
    The power wire for the Curt Wiring Harness # C56434 will just need to be run to the starter battery on your 2019 Toyota RAV4, which is located at the rear of the vehicle. This will actually make the install process a bit easier than with standard vehicles where the wire needs to be run all the way to the battery under the hood. There aren't any specific instructions on how to route the wire but you will just want to make sure you avoid any sharp edges or areas that can become hot during...
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  • Does 12 Volt Power Wire of 2020 Rav4 Trailer Wiring Have to Run to Vehicle Battery
    I understand it's tempting to run the power wire of the # C56434 to a 12 volt source that's easier to get to but you do need to run it to the positive terminal of the battery to ensure the kit's circuit protection is in effect. Otherwise a short in the trailer wiring might cause damage to the vehicle wiring.
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  • Installation of Curt T-Connector on 2019 Toyota RAV4 Hybrid
    Thank you for the kind words and the purchase of the Curt T-Connector # C56434 wiring harness for your 2019 Toyota RAV4 Hybrid! Functionality-wise and install-wise the Curt T-Connector # C56434 and the Tekonsha T-One # 118801 are the same (so you can reference the linked T-One install). The differences between them are that the T-One has higher amp ratings (5 amp stop/turn and 7.5 amp tail) than the T-Connector (3 amp stop/turn and 6 amp tail) and the T-Ones historically have a more reliable...
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  • Could Trailer Wiring for 2020 Toyota RAV4 Be Used without Connecting Power Wire
    If you don't connect the power wire of the Curt harness part # C56434 it will not function. It needs that power wire connected for the circuits to be active. Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need a setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight...
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  • Trailer Hitch that Fits 2021 Toyota RAV4 Prime
    We do have hitches that fit the 2021 Toyota Rav4 Prime. I recommend the Curt Trailer Hitch Receiver part # C13416 which is a direct bolt-on fit. It is very easy to install and provides the larger 2" receiver tube so you'll have a greater capacity for towing and much greater selection of bike racks and cargo carriers to choose from. For trailer wiring then you'd want the # C56434 which is the easiest to install and most reliable.
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  • Tekonsha Trailer Wiring Harness that Fits 2023 Toyota RAV4 Adventure
    Yes, the Tekonsha trailer wiring harness part # C56434 is a confirmed fit for your 2023 Toyota RAV4 Adventure.
    view full answer...
  • Fit of Curt C56434 Trailer Wiring Harness on 2021 Toyota RAV4 Hybrid
    According to Curt, their # C56434 trailer wiring harness is compatible with a 2021 Toyota RAV4 Hybrid model.
    view full answer...
  • Installing Curt C56434 Trailer Wiring Harness on 2021 Toyota RAV4
    They're working fine on this end, I'll send you a .pdf copy via email but I'll also link to an install video showing the harness being installed on a 2021 RAV4. You'll likely find this more helpful than the printed instructions anyway. In a nutshell, to install the harness you'll need to access the harnesses feeding the taillight assemblies. You'll remove the threshold, storage area covers and floor in the cargo area, then loosen and pull back the interior trim panels on either side. Once...
    view full answer...
  • Trailer Wiring that Fits 2021 Toyota Venza Hybrid
    We do have 4-way trailer wiring that fits your 2021 Toyota Venza Hybrid with the Curt T-Connector trailer wiring harness # C57ER.
    view full answer...
  • Will Tekonsha Wiring Fit a 2021 Toyota RAV4 Prime
    Both the Curt # C56434 and the Tekonsha # 118801 wiring will fit a 2021 Toyota RAV4 Prime, but right now (July 2023) the Tekonsha wiring is in a state of "limbo" as the parent company of Tekonsha was bought out earlier this year and everything is undergoing transitions. While we don't have a time-stamp for when the Tekonsha wiring will be back online, I can say that the Curt wiring is perfectly capable of safely and efficiently accomplishing the same goal as the Tekonsha alternative -...
    view full answer...
  • Recommended Easy To Install Trailer Hitch Receiver For 2021 Toyota RAV4
    For your 2021 Toyota RAV4 each of the hitches available install in the same fashion, and as such will be just as easy to install. Between all of the hitches available for your 2021 Toyota RAV4 I recommend the etrailer Trailer Hitch # e23ZR as it is made right here in the USA, and its matte black powder coat finish sets it apart for the other options as it will blend in to the plastic trim on your vehicle much better than the gloss black powder coat the other hitches use. This hitch has...
    view full answer...
    Image 1 for
  • Will the Rear Hatch Door Still Close Properly on a 2020 Toyota RAV4 with 4-Way Vehicle Harness?
    No, the cord on the Curt Wiring Harness # C56434 is not thick enough to cause any issues with the power closing of the hatchback on your 2020 Toyota RAV4. If you would prefer to route the 4-way outside of the vehicle you can mount it with the Mounting Brackets # 18144 and # 18140 to the vehicles receiver hitch. This may require modification to the harness or vehicle to get the harness outside the vehicle.
    view full answer...
  • Trailer Hitch and Wiring Recommendation for 2019 Toyota RAV4 Hybrid
    For your 2019 Toyota RAV4 Hybrid the Curt # C13416 is a fit which also fits the non-Hybrid models as well as the trailer wiring harness # C56434 which is a great option. I really like the Draw Tite hitch because it has great towing capacities and is mostly hidden. The Curt wiring is also easy to install without splicing into the vehicle vehicle wiring.
    view full answer...
  • Replacement Ring Terminal for T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
    I'm sorry to hear that you lost the ring terminal that came with your wiring harness. In order to replace the ring terminal that came with your T-One Vehicle Wiring Harness # 118801 you can use the Ring Terminal - 12-10 Gauge Wire - 5/16" Ring ID # 44-5356A.
    view full answer...
  • Recommended Wiring Harness for 2019 Toyota RAV4
    The # 118801 and # C56434 are both confirmed to fit the 2019 Toyota RAV4. However, if you have the EU model of the RAV4 there is no guarantee these will work with your vehicle. As far as functionality is concerned, these two options are the same. However, the best choice is the Tekonsha # 118801. We have found Tekonsha to be the most reliable when it comes to wiring so I would always choose their wiring harness if one is available. The # 118710 is specifically designed for the Land Rover....
    view full answer...
  • Wiring Harness for 2019 Toyota RAV4 Hybrid
    There absolutely is a wiring harness for a 2019 Toyota RAV4 hybrid, the Curt Wiring Harness with 4-Pole Flat Trailer Connector # C56434. This will be a perfect harness to pair with the etrailer Hitch # e23ZR so you can tow with your RAV4 hybrid.
    view full answer...
  • Easiest Trailer Brake Controller To Install On a 2023 Toyota RAV4
    I recommend the Curt Echo # C51180 as being the easiest trailer brake controller to install on your 2023 Toyota RAV4. If you already have a 7-way this will connect into the 7-way and allow you to control the brakes from your smart phone using the Curt Echo app. If you do not have any trailer wiring yet you will need to start with the 4-Way # 118801 and then add the 7-Way Upgrade # ETBC7L. This upgrade kit provides power to the 7-way to operate the Curt Echo.
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  • Trailer Hitch Receiver and 4-Way Vehicle Wiring Harness For a 2022 Toyota RAV4 Hybrid
    Yes, the etrailer Trailer Hitch Receiver # e23ZR will fit your 2023 Toyota RAV4 hybrid. I have linked an installation video below showing the process of installation on a hybrid in our shop. I recommend installing the T-One Vehicle Wiring Harness # 118801 when you install the receiver. This will give you a 4-way flat connector which is needed for towing a small trailer or if you need Auxiliary Lights # C53201.
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  • Where is 12 Volt Battery Located on 2019 Toyota RAV4 Hybrid to Install Trailer Wiring Harness
    Thank you for the purchase of the etrailer Hitch # e23ZR and Curt Wiring Harness # C56434 for your 2019 Toyota RAV4 hybrid and I can tell you exactly where the 12 volt battery is for your vehicle. I took a look at the owner's manual, and on page 576 it stated the 12 volt battery was located in the "right hand side of the luggage compartment." To access this you need to open the deck board (the floor of the cargo area, basically) by pulling its tab up to raise it. The battery will be on...
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  • Parts Needed to Install 7-Way Adapter on 2018 Toyota RAV4
    In order to add the additional wiring needed to use your brake controller and have 12V power you need the Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers # 5506. This kit comes with everything you need to hook up the additional wires on your existing 7-way adapter. I'm not sure if you're going to use the Curt Echo # C27JR or the Curt Echo # C51180, but this will allow you to use either of them. I have attached an installation video for your reference.
    view full answer...
  • Correct Trailer Wiring Harness for a 2022 Toyota RAV4 (All Models/Trims)
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56434 is a confirmed fit for a 2022 Toyota RAV4 TRD Off-Road. It actually works on all trim levels as well. It features a direct plug-in installation so there's no splicing required and it has a very common four way trailer connector which most trailers use today. In order to complete your towing setup you'll also need a trailer hitch and ball mount/hitch ball. I recommend using the Curt Trailer Hitch...
    view full answer...
  • Parts Needed For Wiring a 7-Way Trailer Connector and Brake Controller On a 2021 Toyota RAV4 Prime
    The Universal Wiring Harness w/ ModuLite and Brake Controller Harness # 22551 will allow you to hardwire in a 7-way connector on your 2021 Toyota RAV4 Prime. The kit includes a brake controller wiring that will allow you to a Redarc Tow-Pro Elite Brake Controller for Tekonsha Harness # RED63RR if your trailer requires a brake controller. This controller is small and includes a Universal Mounting Panel # 331-TPSI-001 for a factory look.
    view full answer...

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Info for this part was:

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