bing tracking image
  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 # 118459
Our Price: $61.71
You Save: 39%
Custom Fit Vehicle Wiring

Will this fit?

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

Orders above $99 qualify for Free Shipping
Shipping Weight: 1.65 lbs
In Stock
118459 - Custom Fit Tekonsha Trailer Hitch Wiring
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
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 118459 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.
  • All Info
  • Reviews (40)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118459

  • 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 trunk
    • 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: 2.1 amps per circuit
    • Tail lights: 4.2 amps per circuit
  • 1-Year limited warranty


This custom-fit T-One connector plugs into your vehicle's wiring harness, which is located inside your trunk, behind the tail lights on both the driver's side and passenger's side. You will need to remove some interior trim or carpeting to access the 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 within your trunk.

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.

118459 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118459 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 - 118459

Average Customer Rating:  4.9 out of 5 stars   (40 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.


After a year it works perfect, much better than wiring kits with converters that are not powered off the battery. It was worth the extra effort to run an extra wire.


Great product and amazing shipping. I’ve gotten a hitch from here as well and was astounded by the great quality! A customer for life


Fast, professional

2013 Toyota Corolla

Installing the wireing was fairly simple, running the positive wire from battery to harness challenging.

What model of Toyota Carolla and what year did you install on?
-- comment by: Bobby M - 03/06/2015

2010 Toyota Corolla

Smooth transaction. Fast delevery. Good product. Well packed.


I received the hitch and wiring harness in 4 business days. The hitch went on in 15 minutes. It even included the ball mount which I had not realized was included. I am definitely glad I sprung for the wiring harness. Having dealt with endless connection problems from cobbled together U-haul and backyard mechanic wire splices, I really enjoyed snapping together factory-like connections. Running the wire to the battery wasn't as bad as many reviews made it out to be. I didn't remove all the interior panels as the wire could be tucked up into most of these panels without removing them, this saved a lot of time.

2011 Toyota Corolla

The wiring was very easy to install on my 2011 Toyota Corolla. It only took about 45 minutes to complete after reading the reviews from other customers. The power wire from the battery was the most difficult part and it was not really hard to do. The plug in connectors were a snap to install. I would recommend this product to anyone looking to install trailer wiring on a vehicle.

2015 Toyota Corolla

Harness install was very easy and quick, less than 15 minutes. The battery wire, on the other hand, is a real bear, it took several hours and may trigger spontaneous bouts of turrets. One look at the stock Corolla tail light wiring and its obvious why it is necessary.

I wish I knew this when I bought the car, I would have negotiated a little more for the dealer to install it.

One nice thing Toyota did on my 2013 was an additional feed through in the main wiring harness grommet where it passes through the firewall. Its about the size of a drinking straw to the right of the main bundle. Simply poke an awl down the opening to make a hole for the wire to push through.


Installation required patienceThe lighting module was easily attached to the tail lamps but running the single power supply source from the battery to the module was challenging. I placed the car on a jack to gain access to the undercarriage and it required about three hours to route and secure the power wire and test the installation. Black tie wraps are supplied but I used longer aftermarket tie wraps (yellow and red) to easily identify the routing of the wire. Both the hitch and wiring harness arrived in less than a week and cost me nothing in shipping. Doing it myself and purchasing the parts from saved me over $150.00.


This is a professionally designed and quality product and very easy to install. The installation instructions are easy to understand. If installing the hot wire from the battery to the trunk seems complicated to you for your particular vehicle, just Google, "How to run a power wire from battery to the trunk on a (write in your make and model here)". You should find many forums to tell you how it is done on your vehicle. This is a great quality product with a much better price than I found anywhere else.
C ya, GC

2013 Toyota Corolla

The hitch and wiring kit arrived within 1 week. The hitch literally went on in less than 15 minutes. As for the wiring kit, Everything was easy, just took some time. I ran the power wire under the car to a rubber gromet on the inside of the back quarter panel that leads into the trunk. Didn't want to risk damaging anything going through the firewall, the car has 3 miles on it. All in all I would recommend this company for great prices, and fast shipping.


Order was delivered quickly. Install was relatively easy. The biggest problem was where to run the wire to the battery through the firewall. Found a grommet above driver's feet that had approximately 2 inches of wires going through it. Noticed a hole on the right side of it and slide the wire through. Then went to engine compartment and felt my wire coming through a capped tube of rubber. Made a small snip with a pair of diagonal cutters and there my wire was.

After that I simply routed it along the drivers side under the trim. It fit great and after that it was just hooking it up.

I did drill a small hole for the ground as the nut that was there didn't do it's job. I put a small sheet metal screw through with a smaller wire connector and it worked great.

2010 Toyota Corolla

First class people and products. Installed my hitch and wire harness exactly as instructions indicated. The videos for installation of harness and hitch were helpful also. Very pleased with fit, function, appaerance. Thanks for making it easy!


Harness installed just fine, took some time to run the wire to the battery properly following the harness from the trunk along drivers side rocker panel.


I needed the wiring in a hurry for a trip. E-trailer delivered it just in time. It was a super-easy installation...just plug and play. Running the wire for the battery took a bit of planning but I ran it through the firewall was a bit of a challenge but I used the existing wire path as a guide. Very pleased with the product.


After a year of use it has proven to be a good choice. Trailer connector lead stows away nicely. Very convenient to hook up when towing the trailer


Running the +12 volts from the battery is the most difficult part of the instalation... The plugs are great...No wire splices....Neat... Clean mounting ....Works great.....


I’m very happy with orders from
my order in timely fashion and my parts are still in working order.
Thank you.


When time is of value, the ease of installation more than pays for the Wiring Harness.

2010 Toyota Corolla

The wiring harness was exactly as stated. The directions were easy to follow and it works perfect!


great product and excellent shipping..the very next day after ordering it was already at the local ups warehouse..then it was delivered the following morning.i will be recommending etrailer to all my friends and family.


I selected this product because it is simple to install and does not require splicing into existing wires. I was not disappointed. The installation was simple and everything I needed was included. All components appear to be high quality and I expect it to last the life of the vehicle.


Relatively easy to install. Make sure the ground wire on the tail light bolt hits metal. I'd use a file to scrape of some paint before bolting the ground wire down.

This is a quality product.

2012 Toyota Corolla

good quality product,directions to install wiring sucks.That definitely needs to be rewritten for someone who wants to install it themselves.

After the initial install the harness works fine,and have had no problems.
Walt B - 10/21/2014

2009 Toyota Corolla

Received everything in good order and fast too. Put the hitch on will finish the electric connections today. Very pleased with your service and price. Thanks much. Gary

Show More Reviews

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

  • Does The Rear Fascia Have To Be Trimmed To Install a Hidden Hitch On A 2009 Toyota Corolla
    No, you will not have to trim the rear fascia on your 2009 Toyota Corolla to install the Hidden Hitch Class I Trailer Hitch, part number 60200. The receiver will be just below the rear fascia when installed.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2010 Toyota Corolla Sedan
    The T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, # 118459, is a powered converter that requires a direct connection to the vehicle battery. This virtually eliminates the power draw from the vehicle tail light wiring which protects the sensitive circuitry. The Curt T-Connector, # 55542, does not require a direct connection to the battery but the power draw from the trailer comes directly from the tail light wiring. For your 2010 Toyota Corolla, I recommend going the safer...
    view full answer...
  • Will Curt T-Connector Wiring Harness # 55542 Fit a 2011 Toyota Corolla
    The Curt T-Connector Wiring Harness, part # 55542 will fit your 2011 Toyota Corolla. This wiring harness will plug into the factory connectors located behind the tail lights. I also offer the Tow Ready T-One Wiring Harness, part # 118459 for your 2011 Toyota Corolla. This wiring harness also connects to the connectors on the tail lights, but it also includes a powered converter that requires a direct connection to the vehicles battery. This will eliminate the power draw from the vehicles...
    view full answer...
  • Difference Between the Tow Ready Harness and the Curt Harness for a 2009 Toyota Corolla
    The reason a wire is run to the battery on the Tow Ready Harness # 118459 is to help protect the tail light circuitry of your 2009 Toyota Corolla. You see, the # 118459 uses the tail light circuitry of the vehicle merely as signal wires and powers the tail lights of your trailer with the power it gets from the battery. Tail light circuits can be damaged if they are overdrawn and the # 118459 eliminates this problem by bypassing the tail light circuits as power sources. The Curt T-Connector...
    view full answer...
  • Will TowReady Trailer Wiring Harness # 118459 Fit 2004 Toyota Corolla
    The TowReady powered wiring harness # 118459 is designed for the 2009 through 2013 model years of the Toyota Corolla. For your 2004 Corolla the recommended harness is Curt # 55542. This kit is simpler to install and actually will deliver higher rated current output than the Tow Ready kit. Your Corolla has heavier wiring than later model years and so can use the non-powered Curt harness. However, my contact at Tow Ready did confirm that you could use kit # 118459 on your 2004 Corolla...
    view full answer...
  • Adapter Recommendation for Going from 4-Way to 6-Way on Trailer
    For a 4-way to 6-way adapter we have the part # 30637 which will plug into the 4-way on your Corolla and then allow you to connect to the 6-way on your trailer. I attached a review video for this adapter for you to check out as well.
    view full answer...
  • Vehicle Wiring Harness For A 2004 Toyota Corolla
    We do have a plug and play kit that is confirmed to fit your 2004 Toyota Corolla. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 55542 will plug into your vehicle's wiring harness, which is located behind the driver's-side and passenger's-side interior trim panels in your rear cargo area. It is recommended that you use a small amount of grease # 11755 on all electrical connections including the 4-pole connector itself. This will help prevent corrosion....
    view full answer...
  • Will the Curt Trailer Hitch Receiver C11265 Fit on a 2011 Toyota Corolla Sport
    The Curt Trailer Hitch Receiver # C11265 is confirmed to fit all models of the 2011 Toyota Corolla. This is a 1-1/4 inch receiver that comes with a drawbar that has a 1-7/8 inch hitch ball. The drawbar has a Rise of 2-5/8 inches which you will want to make sure is correct for your towing application. I have attached a helpful article that you can use to assist you. Keep in mind that if you end up using this hitch for any non-trailer loads (like a cargo carrier or bike rack) you will need...
    view full answer...
  • Recommended Trailer Hitch Ball and Mount for 2011 Toyota Corolla Towing Small Tear Trailer
    If you haven't already installed a trailer hitch receiver, I recommend the Draw-Tite Sportframe Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4" # 24913 which is a confirmed fit for your 2011 Toyota Corolla. I've attached a video of a similar install to assist. Then for your trailer hitch receiver, you will need a ball mount and hitch ball. For this, I recommend the Draw-Tite # 3593 along with the 2 inch ball # 19258. For your trailer wiring, I recommend the Tekonsha T-One Vehicle...
    view full answer...
  • Trailer Hitch Recommendation for 2011 Toyota Corolla
    First you would want to start with a trailer hitch for your 2011 Toyota Corolla. For that the Draw Tite part # 24913 would be a great option confirmed to fit. I like this hitch best for you because it has the best price and does not require a stabilizer strap if ever used with a bike rack or cargo carrier. I attached an install video for more info as well. For a ball mount you would need the part # 3593 and then for balls you need part # 19258 for a 2 inch ball or part # 19256 for a 1-7/8...
    view full answer...
  • Does Draw Tite Hitch 24913 Fit a 2010 Toyota Corolla
    Yes, the Draw Tite hitch part # 24913 that you referenced has been confirmed as a fit for your 2010 Toyota Corolla. I attached an install video that shows this hitch installed on a similar 2009 Toyota Corolla for you to check out as well. If you wanted to do some towing you'd want the trailer wiring harness part # 118459, the ball mount part # 3593, and either the hitch ball part # 19258 for a 2 inch ball or part # 19256 for a 1-7/8 inch ball.
    view full answer...
  • Trailer Wiring and Ball Mount Recommendation for Use with Draw Tite Trailer Hitch # 24913
    You'd have to buy the recommended drawbar part # 3593 separately from the Draw Tite Trailer Hitch part # 24913 that you referenced as it is not included. For a hitch ball you'd want the part # 19258 for a 2 inch ball or part # 19256 for a 1-7/8 inch ball. For trailer wiring you'd then want the T-One kit part # 118459 which is also a confirmed fit.
    view full answer...
  • Recommend Towing Package For A 2012 Toyota Corolla L
    When it comes to installing a trailer hitch on your 2012 Toyota Corolla The Curt Trailer Hitch Receiver - Custom Fit - Class I - 1-1/4 inch is confirmed to fit your L base model. The trailer hitch has a bolt-on installation with no welding required and has a gloss black powder coat finish that is over a protective base coat that offers superior rust resistance. The hitch has a maxim gross trailer weight up to 2,000 pounds and has a maximum tongue weight up to 200 pounds. I recommend checking...
    view full answer...
  • Recommended Trailer Hitch And Accessories for Light Duty Towing w/ 2010 Toyota Corolla
    For light duty towing with your 2010 Corolla, I'd recommend the Draw-Tite Class I hitch, part # 24913. The hitch has the same capacity, but is less expensive. The hitch has a 2000lb towing/200lb tongue weight capacity, but according to the owner's manual, you'll be limited to a 1500lb towing capacity. I'd recommend you confirm the towing capacity for yourself by consulting the owner's manual or Toyota. To complete your towing set up, you'll also need the following: Ball mount, part #...
    view full answer...
  • Availability of Euro-Style Ball Mount for Curt Class I Hitch Installed on 2009 Toyota Carolla
    The Curt # C45561 Euro-Style ball mount you referenced is exactly what you'll need. The ball mount will work fine with your # C11265 Class I hitch once it's installed. Keep in mind that the ball mount carries a 3500 lb towing/350 lbs tongue weight rating, but that your hitch is only rated for 2000 lbs towing/ 200 lbs tongue weight. Because of that difference in capacity between the hitch and the ball mount, you'll need to abide by the rating of the lower rated component, which would be...
    view full answer...
  • Hitch, Ball Mount, and Trailer Wiring Recommendation for a 2009 Toyota Corolla
    The Curt Hitch part # C11265 that you referenced has been confirmed as a fit for your 2009 Toyota Corolla. The thing about Class I hitches like this is that you can only use the recommended ball mount for the hitch otherwise it voids the warranty. For this hitch the recommended ball mount is the part # C45521. For a 2 inch ball you would then want the part # A-82 and then for trailer wiring you would want the part # 118459.
    view full answer...
  • Trailer Hitch, Ball Mount, and Wiring for a 2009 Toyota Corolla Sport
    Once installed on your 2009 Toyota Corolla the Curt trailer hitch # C11265 will be approximately 11 inches from the ground to the top of the receiver opening. That will leave a distance of approximately 3-1/2 inches to account for. The recommended ball mount is # C45521 which has a 2-5/8 inch rise so it will work because the trailer tongue weight will pull down a little and you will be off level by less than 1 inch. For a 1-7/8 inch ball use # A-80 and for a 2 inch ball use # A-82. And...
    view full answer...
  • Class I Trailer Hitch Fits for 2011 Toyota Corolla S
    Draw-Tite Class I hitch # 24913 is a confirmed fit on all versions of the 2011 Toyota Corolla. The hitch includes all the required hardware to bolt it on your car. Both the written instructions and an installation video are linked for you too. If you plan on using the hitch for a bike rack you'll want to select a Class I-compatible rack like the Swagman XC # S64650. This is a great cost-effective rack that provides plenty of space for the bikes at the back of the car. We offer matching...
    view full answer...
  • Affordable Bike Rack That Will Carry 2 Fender Bikes On a 2011 Toyota Corolla
    The Thule Apex XT 2 Bike Rack # TH9024XT looks to be the bike rack that meets all your needs. It is a hanging mount that will hold the bike by the frame. If you have an alternative frame bike a Thule Bike Adapter Bar # TH982XT will be needed. The rack fits both the 1-1/4" and 2" receivers including a class I Curt Receiver # C11265 that fits your 2011 Toyota Corolla LE. It will support 2 bikes up to 37.5lbs each. And has an integrated anti-rattle stinger hitch for tool-free connection. The...
    view full answer...
  • Trailer Hitch Fit for 2010 Toyota Corolla S 4-Door Sedan
    I absolutely can help and I checked with Curt to find the exact hitch for your 2010 Toyota Corolla S 4-door sedan and you will need the Curt Trailer Hitch # C11265. The hitch you asked about, part # C13902 is a larger, Class III hitch and that is not going to fit a 2010 Corolla. I checked with Curt to find the exact hitch for your 2010 Corolla S 4-door sedan and you will need the Curt Trailer Hitch # C11265. This is a Class I hitch with a 1-1/4" receiver, which is the only class of hitch...
    view full answer...
  • Solutions for Transporting Cargo with 2012 Toyota Corolla
    As far as storage space and capacity goes your best option for transporting your cargo to your new home is going to be with a small trailer. A transmission cooler is a good idea to prevent the transmission from overheating and for improving overall performance on any vehicle, but it is rarely ever REQUIRED. Especially since you really only plan on towing a trailer one time, a transmission cooler isn't a necessity for your application. Taking a look at the online version of the owner's manual...
    view full answer...
  • Hitch, Wiring, Cargo Bag Recommendations for Transporting Belongings with a 2009 Toyota Corolla
    Lots of great questions, I can help try to get you some answers. Let's start with the hitch for your vehicle. The one I recommend is the Draw-Tite # 24913. This has been determined that because of your vehicle's size to only support 200lbs tongue weight (cargo carrier) or 2,000lbs towing (trailer). I was able to find 150lbs tongue weight and 1,500lbs towing was your max page 171 of your owner's manual. This hitch must be torqued down to specifications so you will need to either purchase...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Joshua S
Video by:
Joshua S
Employee Kathleen M
Video by:
Kathleen M
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Isabelle B
Updated by:
Isabelle B
Employee Randy B
Test Fit:
Randy B
Employee Ryan G
Test Fit:
Ryan G

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.

Product Experts Available Now!
Call 1-800-940-8924