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 # 118496
lowest price pledge
Our Price: $58.65
You Save: 37%
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: 1.05 lbs
In Stock
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Custom Fit 118496
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. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118496 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 (678)
  • Q & A (0)
  • Photos
  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118496

  • 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 either behind tail lights or along frame rail
    • 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: 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 on the driver's side and passenger's side, either behind the tail lights or along the frame rail. If your wiring harness is behind the tail lights, you will have to remove the tail light assemblies to gain access.

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.

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.

118496 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118496 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 - 118496

Average Customer Rating:  4.9 out of 5 stars   (678 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.

2012 Toyota Tacoma

Products great, Service is great, Delivery service is great, but the guy in accounting that won't give us a a Professional Auto Repair Shop a wholesale account because I said a few curses of words, who is part of the cancel culture and discrimination of expression well he is not so great. And I can keep respectively making this commentary on your reviews with each and every review and not one person in management does anything about it. I suspect ettrailer is more about greed, control, is not about the relationship, but the money. I think they think they are good enough. You ask for my reniews but you really dont care... So from now on it will be nothing but one-star reviews.

I tried to get your attention over and over being nice with 5 star reviews but telling you the guy in accounting is a thin skinned moron with customer interaction. And my curse words had nothing to do with him but the demand from him of something I could not at that minute provide him. So it was about a circumstance and not a personal attack, and countered a solution for us to contact hoim back with the validation for the account but he rejected us. Hung up on me, and still to this day no one has followed up. So Thank you for being just good enough, and not GREAT!

I am sorry to hear you are having a hard time with our company. I have sent your information over to our customer service department for them to better assist you.
-- Etrailer Expert Katrina B - 07/19/2022

2007 Toyota Tacoma

I installed this wiring kit ( Tekonsha 118496) on a 2007 2 wheel drive Tacoma. All components appear to be of decent quality and everything fit and worked as it should. I added protective covering to the wiring running underneath the vehicle to the right side tail light and to the 4 flat plug. When looking for a kit, I was impressed with the information and reviews supplied by etrailer. Compared to wiring a trailer hook-up from scratch, this was a breeze! Shipping was reasonable and took less than 2 weeks to get to Canada.

My Tekonsha 118496 wiring kit is still working well after 1 year in use.
Bryan - 03/01/2022


The installation was straight forward and simple. Everything was provided and it took only around 30 minutes to install. (I live in the back country so some of that time was chipping away at the dried mud.)

2014 Toyota Tacoma

This wiring harness was just what I needed! I bought a used 2014 Tacoma that someone had hacked up the wiring at the tail lights to tap in and hook up trailer wiring. It was a mess and rather than repairing what had been done incorrectly I put it back to stock and ordered this harness after watching the [online] video. It arrived quickly and installed easily! Very happy with the product and!

2009 Toyota Tacoma

My first choice for anything trailer re lated!

Still works perfect
Mike W - 08/30/2022


Installation was easy - didn't want to play with stripping wires and such, so a great solution.

2014 Toyota Tacoma

This is a great product that was super easy to install. I had it wired up in less than an hour. Anyone could install this wiring harness.

2009 Toyota Tacoma

The wiring system was pretty straight forward. The video pretty much said all I needed to know. I'd rather use this set-up than any guy at a hitch shop doing a quick splice to the wiring in my truck, any day. The only thing I did differently from the video was put my wiring in the black conduit that you can buy pretty cheap at any auto parts place. This change will keep the wires from chaffing and makes the whole job look more professional.


One year follow-up: The product works as advertised. No problems at all over the last year. Installation was simple and straight forward. One comment only about the optional mounting bracket for the 4-pin connector: get/use better self tapping screws before you attempt to mount the bracket. Even though I pre-drilled the supplied self-tapping screws are very soft and snapped off. I then relocated the bracket and used my own (hardened) self-tapping screws. Overall I'm very happy with the product.

2012 Toyota Tacoma

I had been looking for a solution to securely add a 4 way flat connection and be able to plug in my Rear LED light bar to. The product was accurate and very easy to install in less than 15 minutes. All plug-n-play. Very happy with the final result. Thank you

Product has been flawless and functioning perfectly
FShams - 02/06/2019

2014 Toyota Tacoma

This was super easy to install and I did it in about 15 mins.
I'm very happy to have a working trailer connector.


Easy to order, intuitive website. Package deliver in just a couple of day, well wrapped and with all the components in it. Here’s the best part, unlike the Reese hitch which is advertised as a 30 min installation but could take the regular Joe two hours with a helper and over that by himself, this harness would take less than 30 minutes thanks to the YouTube video with clear step by step instructions. Btw, delivery is only 4 bucks. Highly recommended.

After a year, no issues whatsoever. If done like the instructions indicate, I don’t foresee any problems. It looks just like the day I installed it.
AlexF - 08/10/2021

2015 Toyota Tacoma

Great services. trailer pulls great for my little truck. Easy to install hooks and hanging items inside. Prices are very competitive, this was the best price and seems like I got more for my money. Staff did great job explaining total weight my truck can handle with this trailer. recommend if you are looking for a trailer to give them a chance. I would expect you to get the outstanding service I received.


Great and the video was very helpful

Still works!
Zavier - 08/26/2022

2014 Toyota Tacoma

2014 Tocoma..The wiring install, went slower the the hitch install.
the main reason was the taping of the wires to the truck wiring and getting up and down. (time was 50 minutes)

Install the driver side first, only the plug is placed with the tail light,
install the passenger next, only the plug is placed with the tail light.
Tape the new wiring to the stock wiring, start with the tail lights and work down you will find you have just the right length of wire. I taped the 2x2 black connector to the wiring harness. If the wires were 6 inch's longer on both sides, I would have used the two sided tape and stuck the connector on the frame

I have used the the trailer connection on 5 different days for about 1 hour each time, two weeks ago I had to used the trailer to help move a friend of ours and it was raining so the lights was on all the time. the trip was 12 hours,there and 7 days of short trips and on the way home about six hours in to the return trip i stopped for fuel and when I started the truck I lost the tail lights and the brake lights,blown fuses. I stopped at a auto parts store and picked up some new fuses,when i turned on the lights the new tail light fuses popped and when I stepped on the brakes, the new brake lamps fuses popped. We stopped for the night, I will not drive a truck and a trailer at night without lights.The next day, and a hundred lighter, I got home, I disconnected the trailer and replaced the fuses. The fuses stilled popped. I opened the tail lights and disconnected the left tail light trailer connection and the fuse sill popped, and i disconnected the right tail light trailer connection and the fuses held. I will pull out the bad harness and replace it with a factory tow harness more money and more time to install but I no more problems and I will order a trailer brake to plug in to the stock wiring.
K.L. - 02/09/2015


Easy installation for my Toyota Tacoma for towing. It is well made. Perfect fit.
Had it for a year so far and no issues.


I am very happy and satisfied with my purchase, everything fitted well with no problems. Thx


The wiring harness was fairly easy to install and directions were spot on. I recommend using flex tubing to protect your wiring; better to be safe than sorry.


everything fit perfectly!!

2015 Toyota Tacoma

Very easy to install with no background knowledge required. Took me about 15 min for our 2012 Tacoma. Installed a year ago and has been working well since.

Its still working great. Had no issues.
Anja - 01/10/2022


I like that I ordered parts & in a couple of days I had them


I’m very happy with the fast shipping and that you add an instructional video for all your products. etrailer seems well organized and pro customer.


1 year review very satisfied and I'd buy again. Online videos prepared me for a weekend warrior garage floor installation.

The wiring harness and plugs fit snugly,securely and are still working correctly. The inline tail light connectors mean no cutting or half-tapping wiring. I tucked the wire harness box and 4-wire flat connector into one of the inside trunk sidewall storage coveys. This keeps all open connectors out of dirt and weather. When I need the 4-wire flat connector I reach in, uncoil it and close it between the hatch and rubber seal. For one of my trailers I carry a 18" 4-wire flat extension to reach the short wire on the trailer tongue.

I recommend you stretch out the harness for test fit to see the best fit before zip tying in place. This is not a product issue but the only hassle is getting the power wire from the harness box in the back of the vehicle, safely thru the body and frame and to the battery under the hood. The harness box had plenty of wire to reach the battery. There are hot wires in the back of the vehicle but I wanted a direct connection to the battery.

2010 Toyota Tacoma

Purchasing the wiring harness with the trailer hitch just makes sense. You know that you receive the right harness for your type of vehicle.

1997 Toyota T-100

Installed on a 1997 Toyota T-100. It took about 30 minutes. Everything was easy to install. It took a few minutes to get the truck plugs pulled apart (probably hadn't been pulled apart before). The plugs on this harness plugged right in with an audible click. I used the included cable ties as well as a few of my own to secure the wiring under the truck. Now all my trailer lights work, and I don't have to worry about any more splicing. I wasn't sure the passenger side wiring was long enough to reach across the truck, but it made the distance with a little room to spare.

I decided on this product after spending most of a Saturday splicing and checking connections. I was trying to find out why I didn't have right signal or brake on my trailer. Truck's lights worked fine, but the trailer's lights didn't. I even checked the trailer while connected to a friend's truck, so I knew the problem was on the truck's end. I put all of the original truck wiring back in place, checked all the lights on the truck, installed this product, hooked up the trailer, checked the trailer lights, and now everything works.

Thanks e-trailer.

Show More Reviews

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

< Previous
123. . .11

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 John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Lori W
Expert Research:
Lori W
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Andrew K
Video Edited:
Andrew K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Kathleen M
Video by:
Kathleen M
Employee Chris R
Video by:
Chris R
Employee Aidan B
Video by:
Aidan B
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
Employee Randy B
Test Fit:
Randy B
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
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.