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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 # 118245
Our Price: $23.70
You Save: 26%
Custom Fit Vehicle Wiring

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Tekonsha No Converter Custom Fit Vehicle Wiring - 118245
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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. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118245 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 - 118245

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No 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 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 just behind the rear bumper.

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 plug on your automobile and the 4-pole connector itself - to help prevent corrosion.

118245 Tow Ready T-1 T-Connector - OE Replacement 4-Flat

Installation Details 118245 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 - 118245

Average Customer Rating:  4.8 out of 5 stars   (110 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.


This harness greatly simplified the trailer wiring process. It was very nice to be able to plug into the factory receptacle on the 4Runner, without having to go through the process of tapping into the individual tail lights.


Plug and play. Hitch was placed on a board and jacked up to meet the bolt holes. Remounted the two tow hooks. Not a lot of extra threads but they all fit perfectly. Glad I had an impact. Wiring had to remove protective cap and plugged in. 4 runner already had a fuse in the box. Bought the 4 flat plug mount but drilling up into hitch proved to be to much so just used a good hose clamp to secure the plug. Also more adjustable wire length if needed.

2010 Toyota FJ Cruiser

The part is perfect and as advertised, though it wasn't exactly what I needed. An oversight on my part, but I made it work. It also arrived quite promptly, which was nice. Two thumbs up for etrailer.

Toyota Tacoma

Love it, works great, good quality and good price. It claims it’s for a 3rd gen 4Runner but fits in perfectly in my 1st gen tacoma. The wires are a little longer than they need to be but it works perfect because i have accessory brake and turn signal lights to plug in so it’s awesome!

2001 Toyota Tacoma

Noticed pevious owner cut the 4 flat end off the truck..rather than splice a new pigtail in I can simply plug and play

2010 Lexus RX 300

Bought RX300. Took it to my garage for checkout and service. They installed trailer harness incorrectly so brake light would not work. Reading etrailer product description and instructions to see if car had a towing package, found plug where they said to look. Ordered part, installed it, connected to trailer and all functions worked perfectly. Only problem that needs correcting is spare fuses only had a 25 amp and not 20 amp so used that for checkout in towing slot. Will need to get some 20 amp fuses next time I go to town.

I would give etrailer 10 stars for clear instructions that I could use before I ordered part, easy to order, good delivery tracking info, and follow up after order delivery. Will always check this site for trailer issues from now on.

Excellent. Wish I had looked at your site before taking it into get it fixed. Would have saved me With your advice and harness it was an easy fix.
Kazumi - 02/09/2020

2001 Toyota Highlander

Great harness. It plugged right up on my 2001 Toyota Highlander. It has plenty of length to be able to mount it any place you need to put it. Super easy installation and inexpensive.


Hitch and light pigtail were ordered. Draw Tite round tube Hitch was a perfect fit and on in less than an hour. Lights: Easiest hook up ever! Lights were working in minutes after opening the box. Perfect online ordering experience!

Still working like a champ after a year!
Dennis - 10/22/2020

Toyota 4Runner

Bought this to replace my factory Toyota harness that had broken in a spot I couldn't easily splice back together. This fit the factory plug, and while not an exact factory duplicate, it fits well enough in the bracket intended to hold it under my hitch well enough that I'm not too worried about it falling out. My 4runner came equipped with a tow package, so it was plug-and-play. No need to add an additional fuse or make any other modifications. I've used it several times pulling trailers and everything worked as it should right out of the box.


It was easy to install. My only complaint would be the cord was way to long for my application.

2002 Lexus RX 300

This trailer connection was plug and play on my 2002 RX300. Took less than a minute once I was on my back under the car. I just unplug when I am not pulling a trailer.

Harness has held up with no corrosion or wires breaking. I use the hitch about 4 times a year making sure to replace the cover over the connection when not in use.
Robert - 11/15/2019

2003 Toyota Highlander

I first went to local supplier to purchase the hitch and their price was over twice as expensive compared to etrailer and the closest install time they could provide was several weeks. I then went on line and found etrailer. They delivered within 1 week and at a great price. The hitch and wiring was easy to install and it's been trouble free for over a year. I would highly recommend etrailer to family and friends without hesitation.

2002 Toyota 4Runner

Excellent!!! Received the trailer attachment right away. Wasn't sure what I needed but the website helped me to find exactly what I needed based on the stock information on my vehicle. Helped my confidence in the purchase.


Thank you! It still works great
Chris B - 06/17/2016

Chevrolet Colorado

I filled out a questionnaire earlier through customer service saying that I was very pleased with your website, customer support and product quality. We arrived in Colorado Springs (1230 miles) on Sunday, July 6th. The Hidden Hitch trailer hitch worked very well, along with the wiring harness. Thanks again for your concern and support.

2015 Lexus RX 300

The wiring harness was a perfect fit to the factory trailer connector on my 2002 Lexus RX 300. The universal brackets for the plug allowed me to securely mount the plug on my round tube [vendor] hitch. I found the factory plug in the exact location shown in the video. Although installing these items is not rocket science, the videos relating to them saved the time that could have been spent figuring it out. All in all a 15 minute job.


First time ordering from this site, but with strong recommendation from my hitch installer. The wiring harness performed as recommended and I really appreciated the fact that a fuse was included in the package. I highly recommend this product and i would purchase other towing related product from this site without hesitation.


Wiring harness was easy to install. Made attaching the four pole flat trailer connector a snap.

2010 Toyota Land Cruiser

2002 Toyota Land CruiserSo easy and OEM Quality, one note on my Land Cruiser it had a blank dust cover plugged into outlet that harness needed to plug into. Once I removed that blank and plugged in new harness I was good to go. Whole project including mounting bracket I ordered took 10 min. including testing operation.

2002 Lexus RX 300

My 2002 Lexus RX300 needed a new trailer harness and I couldn't be happier with the one I ordered here. Part was mailed the same day I ordered and was an exact match. Just plugged it in and was good to go.

2002 Toyota Highlander

Excellent product, plug and go on my 2002 Toyota Highlander. Make sure you have the right receptacle under the cover of your highlander and you should be all set.

Also, MAJOR KUDOS to Bill E at etrailer, who, on a sub-$20 order made me feel as important as a million dollar customer. I had some concerns about delivery time, and he kept an eye on things for me, kept me informed with several emails and calls. Who does that on such a low dollar order except Bill E at etrailer? I will NEVER go anywhere else.

2003 Lexus RX 300

Order came quick. Superior heavy duty packaging. Everything I ordered was in perfect condition and all accounted for. I would highly recomend The added benefit is th installation videos on their web sight.

2015 Toyota Tacoma

Product works great. Despite the claims to the contrary, I took the risk and bought it and it fits in my 2003 Tacoma with factory installed hitch. Only took 15 minutes to install. It would be great to include zip tape with the product to help with the install.


this wiring harness took one minute to hookup and has been working fine for a year.

2003 Lexus RX 300

This one was literally a snap! The how to video showed me where to find the connector and how to run the harness before I ever placed my order.


If your Lexus is equipped with trailer tow package, then
this is the way to go. It puts trailer electrical load on separate fuse
from auto and definitely beats hacking into auto wiring. Both
big pluses.

Show More Reviews

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

  • Tow Ready Custom Fit Vehicle Wiring # 118245 Recommendation for a 2001 Toyota 4Runner
    That harness you found would plug into the gray connector of the Tow Ready Custom Fit Vehicle Wiring # 118245 that you referenced and thats all you would need to do to have a working 4-way on your 2001 Toyota 4Runner.
    view full answer...
    Image 1 for
  • Troubleshooting Wiring Harness Install on 2003 Lexus RX 300
    The T-One Vehicle Wiring Harness for Factory Tow Package # 118245 is a plug-in for a 2003 Lexus RX 300 and would only require you to place a 20 amp fuse like shown in the accompanying photo and linked video to the install of this part on an '03 RX 300. Uninstall the connector and see if the light on the dash goes off. If so, try re-installing it by following the same steps as in the video. If the light remains on I recommend having your vehicle looked at by a mechanic to determine the issue...
    view full answer...
    Image 1 for
  • Best 4-Way Trailer Wiring Harness for a 2002 Toyota Land Cruiser
    The correct 4-way trailer wiring harness for your 2002 Toyota Land Cruiser is the T-One Vehicle Wiring Harness part # 118245. The connector that you have attached a photo of is not the correct one. The correct one will be located directly behind the rear bumper or in a small black box located under the vehicle (see photo). You will need to remove the four screws and open the box if the connector is not located in the above location. Please keep in mind that there will be several unused...
    view full answer...
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  • Connection Points for Trailer Wiring on a 2003 Toyota Highlander
    I would be glad to help you out with adding trailer wiring to your 2003 Toyota Highlander. The Tow Ready Harness, # 118413, is designed to plug in line with the tail light wiring behind each tail light on the vehicle. Inside the rear cargo area, behind the tail lights, there are access panels that allow you to get to the tail light wiring connectors. All you have to do is unplug them and plug in the connectors on the wiring harness in line with the vehicle wiring. Ground the white wire...
    view full answer...
  • Recommended 4-Way Flat Connector for a 2014 Toyota FJ Cruiser
    I do have a solution for you to add a 4-Way Flat wiring connector to your 2014 Toyota FJ Cruiser but unfortunately the T-One Vehicle Wiring Harness # 118245 won't fit. Instead what you will need to use is one that tees in behind the tail light housing. I recommend the T-One # 118405 because we have found the Tekonsha wiring to be the most reliable. This tees in behind your tail lights and then draws power directly from your battery so as not to overload your wiring system. Attached is...
    view full answer...
  • Trailer Wiring Harness Options for a 2001 Toyota Highlander
    You can use wiring harness # 118413. It is designed for use on a 2001 Toyota Highlander that does not have the factory tow package. Wiring harness # 118245 is for models that came with the factory tow package. On wiring harness # 33425 the 12 volt power connection is what powers the trailer lights. On harness # 118413 it gets the power and signals for the trailer lights through the vehicle wiring. Having a powered converter that connects to the vehicle battery is another way that the vehicle...
    view full answer...
  • Installation Instructions for Tow Ready Connector # 118245 and # ETBC7 on a 2002 Toyota Highlander
    As long as you follow the installation instructions for the Tow Ready Custom Fit Vehicle Wiring # 118245 and the Brake Controller 7 & 4 Way Installation Kit # ETBC7 everything will be powered correctly and will work fine. I attached installation instructions for both products as well as an installation video for the # ETBC7.
    view full answer...
  • Product Comparison Between Vehicle Wiring Harness C55245 vs 118245 for a 2001 Lexus LX 470
    I can help compare the # C55245 and the # 118245. These two wiring harnesses are designed to do the same job for wiring up your 2001 Lexus LX-470 the only real difference is the manufacture that they are distributed from. The # 118245 is designed and distributed by Tow Ready a company owned by Cequent Manufacturing and the # C55245 is designed and distributed by Curt Manufacturing. Both harnesses plug in the same way and provide a 4 pole connector for your vehicle end. For your vehicle...
    view full answer...
  • Adding a Second 4-Way Flat Connector to Activate Brake Lighting on a Truck Cap
    I do have a solution for you, but we do not have any adapters that will plug into the Tekonsha T-One # 118252 and provide 2 female 4-Way flat connectors. Instead, I recommend installing the 4-Pole Hardwire Kit with Circuit Tester # 18252 and splice it into the T-One # 118245 right behind the female 4-Way. This kit comes with 6 feet of wire so if that is too much you will want to cut it before splicing the wiring together color for color. Please note that part # 118252 that you referenced...
    view full answer...
  • Troubleshooting 4-Pole Wiring Harness on 2003 Lexus RX300
    Tekonsha 4-pole wiring kit # 118245 is the correct OEM replacement harness for the 2003 Lexus RX300 with factory tow package. If you checked the fuse and tested the pins on the 4-pole plug and have no power on any of the 3 circuits I suggest you unplug the harness and test the OEM connector on the vehicle where this part plugs in. If you have signals there, upstream of the 4-pole harness, then the harness may be bad. If you do not have signals there then there may be an issue within the...
    view full answer...
  • Wiring Harness for a 2003 Toyota Highlander
    The wiring harness you referred to, product number 118248, will not fit your vehicle. You will need either wiring harness part number 118413 or 33425 for your 2003 Toyota Highlander. If your vehicle has the tow package, please use item number 118245. This is the connector which plugs into the white plug you found. There are instruction sheets for each of the parts listed on their product page. For your convenience, I have attached links to all of the items I referred to. I have also attached...
    view full answer...
  • How Do I Know If My 2002 Toyota Highlander Has The Tow Package
    If your vehicle has a functional factory tow package there will be a connector at the rear of the vehicle behind the rear bumper. This connector could possibly be inside a black box that is mounted under the vehicle. If the connector is present you will need to test it with a circuit tester, item # PTW2993, if you need one, to make sure it has stop, turn and taillight functions. If the factory tow package connector is not present or the wiring is not functional to the connector, you will...
    view full answer...
  • Recommended Trailer Wiring Harness for 2001 Lexus RX300
    If your RX300 has the factory tow package, you can use the Tow Ready # 118245 which will plug into the connector located behind the rear bumper (see linked instructions). If your RX300 does not have the tow package, the trailer connector will need to be hardwired into the existing wiring use the Tow Ready # 119147KIT. I will include a link to the general installation instructions as well as to an installation overview video. You will need to access the rear of the taillight assemblies,...
    view full answer...
  • Trailer Wiring Harness for a 2003 Lexus RX 300 without Factory Tow Package
    The wiring harness you have, # 118245, is designed for a 2003 Lexus RX 300 that came with the factory tow package. Since the harness is not working that is one indicator that you may not have the factory tow package and would require a different wiring harness. For a 2003 Lexus RX 300 without the factory tow package use wiring harness # 46255 you have referenced or # 119147KIT. I have included links to the installation instructions for you.
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2007 Toyota FJ Cruiser
    Tekonsha wiring harness # 118245 fits various Toyota and Lexus vehicles but for your 2007 Toyota FJ Cruiser the harness that is recommended is Tekonsha part # 118405. This harness plus in at your taillights and requires only one wire be run up to the engine compartment for connection to the battery + terminal through the included fuse holder. I have linked a video and an installation article to help you see the process. If you test the 4-prong connector under the bumper of your FJ with...
    view full answer...
  • Brake Light & Turn Signal Will Not Work on One Side of a Trailer Connected to 2008 Toyota FJ Cruiser
    The easiest way to determine if the problem is on the vehicle side or the trailer side is to do a little testing. First, with the trailer disconnected, have someone sit in the tow vehicle to operate the lighting functions. Then use a circuit tester such as # PTW2993 to test the connector on the tow vehicle. If the connector does not show any power when it is supposed to then the issue is on the vehicle. If it does work as it should, then the issue is on the trailer. On the vehicle side...
    view full answer...
  • Recommended 4-Way Flat Vehicle Harness For a 2014 Toyota FJ Cruiser
    The Tekonsha T-One Vehicle Wiring Harness # 118245 will not fit your 2014 Toyota FJ Cruiser. It is designed for a 2001-2002 FJ. The do both share similar connectors but they are both female connectors. For your FJ I recommend the Tekonsha T-One Vehicle Wiring Harness # 118405. The install will be slightly more complex but I have linked a installation video below that will help guide you through the installation process. The Mounting Brackets # 18144 and # 18136 will allow you to secure...
    view full answer...
    Image 1 for Image 2 for
  • Parts Needed to Install a 7-Way Trailer Connector and Brake Controller on a 2001 Toyota Highlander
    In order to install a 7-Way trailer connector on your 2001 Toyota Highlander, you must first install a 4-Way. There is more than 1 option for you vehicle. If the vehicle came with a factory tow package, you would use # 118245, which is a replacement wiring harness. If your Highlander never came with the wiring harness or tow package, you will need to use # 118413. Installation of this harness is not difficult and I have included a link to the installation details for you. After the 4-Way...
    view full answer...
  • 4-Way Trailer Connector for a 2004 Lexus GX 470
    The T-One # 118245 that you referenced will fit a 2004 Lexus LX 470 or RX 300 but for your GX 470 you need the universal harness # 119147KIT if your vehicle didn't come with the tow package. If your Lexus is the GX 470 and it did come with the tow package and you are wanting to use a 4-Way instead of a 7-Way then you can use the Hopkins Plug-In Simple Vehicle Wiring Harness # HM43374 instead which has both a 4-Way and a 7-Way connector.
    view full answer...
  • Factory Trailer Wiring Harness Connection Point on a 2001 Toyota Highlander
    If your 2001 Toyota Highlander came with a factory tow package then there is a connection underneath. But if it did not come with a tow package the connector will either A) not be there or B) not be functional. On vehicles that have the connector it is located behind the rear bumper. On some, it is located behind the bumper and inside of a plastic box. Take a look at the instructions I have linked for harness # 118245 which should help you locate the harness if it is present on the vehicle. If...
    view full answer...
  • How to Determine Brake, Running, and Turn Signal Lights, on a 2001 Lexus RX300
    To determine which wire, control the turn signals, brake lights, and running lights it is best to use a circuit tester, part # PTW2993, and test each wire to see what function it controls. If possible is it nice to have another person help you with this and operate the turn signals, lights, and brakes. First you must locate the vehicle wiring system. In most vehicles this can be found behind the drivers side cargo area near the tail lights, please consult your owners manual for the...
    view full answer...
  • Location of Brake Controller Connector-2011 Jeep Grand Cherokee w/ Factory Tow Package
    The Tekonsha # TK93VR is the correct brake controller harness for your vehicle. The connector that the TK93VR plugs into is located under the dash to the left of the steering column taped to another wiring harness near the emergency brake pedal. In some cases, there's a trim panel under the dash that needs to be removed. If you click the link I've provided to the installation video, you can see where the connector is located at the 1:10 mark. The TK93VR plug is compatible with Tekonsha...
    view full answer...
  • Recommended Parts to Tow a Trailer with a 2002 Toyota Highlander
    You're certainly not leaving yourself a lot of time. The trailer hitch receiver I recommend for your 2002 Toyota Highlander is the Draw-Tite Class III # 41541. The 2 inch receiver will have give you the full capacity of the Highlander and also give you a lot more variety in accessories that will fit. If your Highlander has a wiring connector just behind the rear bumper then you have the factory tow package. In which case I recommend using # 118245 for the wiring harness. If you don't...
    view full answer...

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