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

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

Item # TK74FR
Our Price: $32.45
Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom wiring harness. T-One connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number TK74FR or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.
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Tekonsha Custom Fit Vehicle Wiring - TK74FR

  • 4 Flat
  • Trailer Hitch Wiring
  • 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 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
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


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


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

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

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

118292 Tow Ready T-1 T-Connector - 4 Wire

Installation Details TK74FR Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - TK74FR

Average Customer Rating:  4.8 out of 5 stars   (216 Customer Reviews)

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


However, I would rate etrailer as 5 stars. Hope you can use this information on your database.

I did business several times with your company and every time I was satisfied with.

I had a problem with one of the parts I received in a previous acquisition, and etrailer replaced it seamless and quickly. So I continue ordering.

Price is on the high side, but considering my previous experience with etrailer I am ordering from your company.

I also appreciate quick responses to my questions.

This time products were received OK and have been already installed successfully.

One question:

The wiring is instaled but is loosen underneath the vehicle. That does not match the visual quality of the hitch or the vehicle itself.

Do etrailer has a box or something to hold this wiring under the vehicle while not in use ? ...Or have any suggestion for that ?

Etrailer Expert

Brooke M.


It sounds like you are talking about the end that would plug into the trailer wiring needs a home. If thats correct then part # 18144 would take care of that for you. If there is extra slack, I have heard of others using some zip ties to secure it.

2024 Toyota Highlander

I'm disappointed with etrailer. I have used them in the past with excellent results....but this time service was not so good. Ordered a hitch and wiring for my wife's 2024 Toyota Highlander. The Curt hitch was installed no problems. Wiring was a nightmare. First attempt received a converter and wiring that would require me to splice into the wires. Second attempt received the converter with 10 pin connector, but the 4 pin wiring/connector does not fit a 2024. This is the third attempt, and hopefully this will finish the job.


Product as advertised...exact match for our vehicle. Plenty of wire length to reach the hitch.



Durable, reliable, quality product. No issues whatsoever.

2023 Toyota Highlander

Consistently efficient and reliable ser vice

2021 Toyota Highlander

Exactly what I needed for my highlander, easy install

2023 Toyota Highlander

Great price and so easy to install if you have the towing package. This item, along with a hitch, was shipped the same day as I ordered it. Easy to use website, great customer service and well edited videos. There’s nothing else to say but Thank You!


Ordered this simple trailer connector December 12. Very small part and chose to have it sent economy (=USPS). The post office was overwhelmed and providing substandard service. Thanks again 2020. I contacted trailer on Dec 21 and spoke to Danielle. I explained how I needed the part for a post Christmas need and really had expected it to have arrived already. Danielle was very professional and listened carefully. Although it was still to early to initiate a call she said she’s would follow up the 23rd. AND she did, I received an email from Danielle with a status from the postal service and some kind words assuring me that it was on the way. It did arrive on Christmas Eve as described. The review is: disappointed with the post office and highly recommend the outstanding customer service from etrailer!! And the wiring adapter is good too.

Saturn Relay

Great product. I w8sh there was a warning that there is a relay that you have to buy in 9rder for the wiring harness to allow power to and light up the trailer but I found that at my local Toyota dealership

2022 Toyota Highlander

I found it really easy. Definitely need a second set of hands. The dealership trys to BS you and charge ridiculous amout of money selling you a tow package (V6 XLE highlanders come stock with tow package. All you need is a hitch and cable.


Simple plug and play.

2021 Toyota Highlander

Installation was just what I expected. Easy and working well.


Haven't installed yet but please with the delivery time.


Excellent customer support and products perform and fit as specified.


It took less than 5 minutes to install


Great fit for a fraction of the cost. Easy to install and great documentation. I recommend following the forum for lots of tips on how to DIY this.


As we setup the car for pulling a trailer, this was a super easy to install setup. Requires a little digging in the car however, once you find the jack int eh car, this harness is perfect.

Toyota Highlander

Will work on a 2022 Toyota Highlander XLE AWD Hybrid


Love it. Fit perfectly, well made and easy to install . Saved $xxx by not having a dealer install it.

2021 Toyota Highlander

The hitch fit very nicely under our '21 Toyota Highlander XSE. The only part visible is the hitch receiver. Very happy to pay a little more for a better aesthetic.


It is made clear that this harness is for a vehicle equipped with the factory tow package. What is not clear is that if you have the harness plug on your vehicle, that is not indicative of having a tow package. Granted there are other components that would be obvious that a tow package is present, but it seems logical that if the connection is present, it should work. In order for the trailer lights to work, you need a converter box. Some sites show it as a 4/7-way pug adapter, but the picture is wrong, keep checking other sites to see the actual device. Also, there are plenty of forums that discuss this problem. The converter powers up the harness and the connection will work. The converter, which is simple to install, is about $xx from [dealership]. The kit supplied by etrailer is way more involved than the factory converter. Just be aware that the presence of the factory plug itself is not indicative of having a tow package.

Etrailer Expert

Katrina B.


You are correct, if you do not have the factory tow package, then you will need to have a converter box for the installation. There have been instances where the Toyota Highlander does have plugs that will fit but are not activated. When this happens, it means that you actually would need to activate the tow package with a fuse. In order to get that confirmation, you can contact a Toyota dealership to find out. If you do not have the tow package then you would need part # TK99FR.

2022 Toyota Highlander

Purchased item and received it very quickly. I followed the video that was posted for the item which was very helpful. As stated in the video it is helpful to have two people to lift the hitch into placement. I am very satisfied with the product and the ease of installation.


Your website did not adequately specify the right vehicle for the wiring harness after I had ordered the hitch. Consequently I am spending 3 days trying to find the right wiring kit. Not very happy with the execution by your company.

Etrailer Expert

Jenny N.


I am sorry to hear that the harness will not work for you. I see that the harness is meant to be used with a 2020 Toyota Highlander that has the factory package. For the 2019 Toyota Highlander I do have a few options that I can recommend. If your Highlander does have the factory package, then part # 56042 would be the best fit. If your Highlander does not have the tow package, then you would need part # C56217 for a 4 way or if you want a seven way it would be part # 22119. I will have our customer service team send out return instructions for you.

Toyota Highlander

I easily found the trailer plug under the rear bumper cover of my 2021 Highlander Limited. Initially I was not clear on whether I needed a converter. The answer is yes! But the converter plugs in at a different location. The converter plugs into a socket located behind the left rear interior quarter panel. There is a really good video of this on Utube. What you need is etrailer part TK99FR, which includes both the trailer wiring harness and the converter. Since I already had this wiring harness from etrailer, I used a Toyota converter (part 725-48200) that I obtained from a local dealer. Regardless of whether you use the etrailer converter or the OEM converter, it is a super easy connection to use the plug-in provided by Toyota. No splicing needed!

2020 Toyota Highlander

Easy to install but doesn't work. Did some additional research and maybe should have bought the TK99FR which comes with some additional adapter or something. But nowhere did it say to research this possibility before ordering. You see the TK74FR stated clearly that it would fit my vehicle. Frustrating!

Etrailer Expert

Tyler M.


Hi Maureen, Thanks for our feedback! This kit is for the 2020 Highlander with the factory tow package. For your Highlander, it sounds like you will need the T-One Vehicle Wiring Harness, part # TK99FR , for Highlanders without the factory tow package.

2020 Toyota Highlander

Installation was a breeze. Following the video and with the aid of a friend, the hitch slipped into place without any hassles. Used the Pig Tail I purchased with the hitch which is "plug and play". Completed the task with the purchase of the Toyota Highlander Tow Converter from a local Toyota Dealer. The Quality of the hitch speaks for itself! IMHO, the hitch looks superior to the "through the bumper" OEM assembly.

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Chris R
Video by:
Chris R
Employee Thomas T
Video by:
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Employee Wilson B
Updated by:
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Employee Alexander C
Written by:
Alexander C
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee Clayton O
Test Fit:
Clayton O
Employee Bradley B
Test Fit:
Bradley B

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