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

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

Item # 118413
lowest price pledge
Our Price: $34.37
You Save: 66%
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: 1.06 lbs
In Stock
Tekonsha Converter Custom Fit Vehicle Wiring - 118413
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

Customer Photos

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 - no cutting, splicing or tapping required. Includes tail light converter. 1-800-496-5010 to order Tekonsha custom fit vehicle wiring part number 118413 or order online at Free expert support on all Tekonsha products. Guaranteed Lowest Price 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 (259)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118413

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 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 - no cutting, splicing or tapping required. Includes tail light converter.


  • 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 - no cutting or splicing of wires
    • Locate connection points in rear cargo area
    • Plug in T-connector
  • Includes a tail light converter to ensure that your vehicle's wiring matches that of your trailer
  • 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 behind the driver's-side and passenger's-side interior trim panels in your rear cargo area.

Once installation is complete, the 4-way flat connector will be stowed within your trunk or 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.

Tail Light Converter

A tail light converter 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. The tail light converter combines 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.

118413 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118413 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118413

Average Customer Rating:  4.9 out of 5 stars   (259 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 - no cutting, splicing or tapping required. Includes tail light converter.

2006 Toyota Highlander

I'm not very experienced with auto repairs/upgrades, but this was relatively easy, even for this 66 year old grandpa!! The eTrailer video covers it very well, and the only issue I had was that the adhesive-backed part didn't stick. (Yes, I took off the backing first). They even included zip ties to keep it neat.

One thing I noticed after the fact, and redid, was that in the black tray on the driver's side there is a notch on the outside wall location. In the middle of that notch there is about a 5/8 inch slot that I believe Toyota provided expressly to route out the 4 prong adapter wire. No doubt to make it easy on their dealers. That's the place to route it out from behind the panel. (See pic).

Also, I bought a Hopkins model 48625 tester that you hook up to your project to see if it is working properly. It shows you if the tail lights work, and the left and right turn signals. (You start the car, turn on the lights and work them from the drivers seat). If I have any trailer problems in the future, it allows one to test the car separately, and if that is working, then it must be with the trailer. I'm glad I bought it. Overall, a great kit. I recommend it. ETrailer shipped immediately and it came without any damage.

Hi. Thanks for the follow up. The hitch and wiring work flawlessly! I bought it to haul a small sailboat and it is very rugged. Works great! I highly recommend it.
Bruce H - 01/23/2018

2005 Toyota Highlander

I was looking to purchase a trailer hitch and wiring assembly for my 2005 Toyota Highlander. What I found on the internet was a company called "". This company had videos showing how to install their hitch and wiring assembly for my year and model. The installation looked easy with NO wire cutting. I ordered both parts. George J from e.trailer followed up with a series of emails letting me know that my ordered and on it's way with tracking info. The order was received on time and when unpackaged everything was of high quality. My son and I installed everything in a little over 30 minutes. The videos were spot on and made installation a snap! It was a pleasure to work with this company. Jim M. Fredericksburg, VA

Great, no problem.
James M - 10/30/2018

2006 Toyota Highlander

The harness was very easy to install on my 2006 Toyota Highlander and is still performing well one year later.


Installed easily, works excellently. No cutting or splicing needed. Instructions were clear and concise.

2004 Toyota Highlander

Wiring harness works great. Instructions were not very clear, but the installation process was so simple it didn't matter.


This is high quality merchandise.
I expect
to have many years of problem free results.

Great customer service from George J.

Not to good. Its showing a significant amount of rusting. Im unpleasantly surprised.
Steve - 05/02/2022

2005 Toyota Highlander

I was very impressed with how easy it was to install. The hitch lined up perfectly and was on in 20 minutes, the wiring harness was equally easy to install. I would highly recommend to anyone.


It was easy to install and didn't require any splicing.


The product itself seems to work great, so I will give it 5 stars. My only concern on installation of the product was due to the lack of a self-tapping screw to provide a sure grounding. I ended up using a bolt that I questioned.
However, I then had to install a 7-pin adapter which did come with a self-tapping screw for grounding, so I'm not sure if the bolt I used was sufficient, but everything works fine now.

I never had any issues with the product. It has worked perfectly.
Victor - 08/06/2021


great product good price fast service

2003 Toyota Highlander

worked great an was super easy to insta ll


This harness worked like a charm. All I had to do was order it, watch the video on my cell phone as I installed it and badda-bing badda-boom everything was installed. Worth it for the price and ease of install. I would recommend.

One year later and still going strong. Happy with the purchase
Brian M - 07/10/2021


The harness is holding up like new. As always, etrailer makes the buying process so easy and convenient. I will continue to buy from and recommend etrailer in perpetuity.


Does exactly what we need it to and Kyle was incredibly helpful when working through what we needed to get and what would work for our set up.

2005 Toyota Highlander

Snap to install -- took less than 5 minutes! Works great! Love the integrated snap-on cover for the trailer connector! What more can you possibly ask for??!!??


The trailer light adapter went on easily and worked perfectly
immediately and has been working great ever since.

I highly recommend this product to everyone!


Great company to do buisness with.
I orded all the parts and they arrived in a timely manner. The box did arrive with huge hole in it due to the good ole post office not etrailer. Thanks to the way etrailer packed it nothing was lost. Yay etralier. It was easy to install just took the old 4 bolts and tow bars down and put up the new hitch and new 6 bolts. Only took about 5 minutes. The video instuctions for the wiring made it easy also maybe took 7 miutes to do wiring. Thanks etrailer for making and easy project even a girl can do. :-

It has been a year and the product is still in excellent condition. I have used it often and no complaints. Would order from etrailer again. Thank etrailer
Paula - 10/30/2014

2003 Toyota Highlander

Harness arrived on schedule and well packaged. All connections were easily made, except for the ground. Routing the wires proved difficult. I believe the tutorial that I watched was for a 2003 Toyota Highlander and the wiring harness was not where the tutorial showed, so I had to improvise in order to hide all the wires. The only wire I had to cut was the ground, in order to put a larger end on it. When finished, you'd never know I was there. The trailer plug hides nicely in the rear compartment when not needed. I'm very pleased with the final results. Thanks!

Still happy with the end result.
Dick B - 06/01/2018

2008 Hyundai Azera

I've installed several trailer wiring kits, and this was by far the easiest one ever. except for finding a place to locate the black box and securing the wiring harness to existing guides, it was plug & play. Nice not to have to strip wires, solder, and tape connections.

The wiring harness still works perfectly. I havent had to do a thing to it, except use it to power the lights in my trailer.
Stephen W - 03/23/2019

2005 Toyota Highlander

Generally, the wiring harness arrived quickly and in good shape. It was pretty easy to install. My only criticism is that the pictures provided on the directions weren't very good. Also, I recommend buying a 4-way flat connector tester (which etrailer sells) for about 5 bucks to be sure every thing works well before you attach a trailer to your rig.

David, thank you for your review. I would recommend curts 4 way flat tester part # I26
Curt LED 4-Way Flat Connector (Vehicle End) Tester
to test your connection.
-- Etrailer Expert Heather A - 05/11/2018


I got the trailer wiring harness and loved it. Received it within 3 days of order. Installation couldn't have been simpler. It took about 20 minutes and now I have lights for my trailer. etrailer support was awesome. After ordering the part I was able to go directly to a video showing how to install it.

1 year later and I still love it. I still remember how easy and seamless the installation was. I think about that every time I plug in the trailer lights. Etrailer is my go to website now.
David N - 06/19/2018

Ford Five Hundred

The hitch was very easy to install and fit well. The wiring harness vas easy to install also. It's maiden trip of 500 mile went without a hitch! (pun) I'm very happy with the products!

Everything is fine. I did purchase the items for a one time use and that was the last time they were used. They worked fine and are there and ready if the need arises again. However I am very happy with everything cost, value, quality, fit, installation, etc.. I am contemplating a towing unit for my old pickup truck and if I decide to go that route etrailer will be the first place I look.
Bob O - 01/14/2018


Friendly professional service, great prices, quick shipping and excellent follow up on my order. I would definitely buy from trailer again.

2006 Toyota Highlander

Was shipped fast and a breeze to install. Fit up was perfect. Shipped with instructions and hardware pack. The 118413 wiring pack was also fantastic and a dream to install. This will work well for hauling a boat and utility trailer now. Thanks etrailer!


Too quality and fit. No issues installing by myself. Hitch wiring and everything came together flawlessly.

Show More Reviews

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

< Previous
123. . .4

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

  • Why

    At we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • 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 Mike L
Expert Research:
Mike L
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 Andrew K
Video by:
Andrew K
Employee Joshua S
Video by:
Joshua S
Employee Alan C
Video by:
Alan C
Employee Nicholas E
Test Fit:
Nicholas E
Employee Rick A
Test Fit:
Rick A
Employee Shane T
Test Fit:
Shane T
Employee Mike H
Video Edited:
Mike H
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 Cole B
Installed by:
Cole B

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 1-800-496-5010