bing tracking image
  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector

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

Item # 118392
Our Price: $33.94
You Save: 56%
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.

Shipping Weight: 0.71 lbs
Add to cart
In Stock
118392 - 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

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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118392 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 (409)
  • Q & A (0)
  • Photos

Tekonsha Custom Fit Vehicle Wiring - 118392

  • 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 existing wiring - 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
    • 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
  • 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 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 in an out-of-the-way location within your 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.

118392 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118392 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 - 118392

Average Customer Rating:  4.8 out of 5 stars   (409 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.


Used this on my AWD Express Moto Van. Straight forward easy hookup to the factory harness. Plenty of length on the trailer side wiring to run it out the back and connect to the trailer. Definitely worth the money to save the hassle of tapping into the factory harness.

Chevrolet Silverado 1500

wiring harness for my 1500 express van fit great plugs rite in and works great.


Installed in minutes appears to
be a nice addition to our business for hauling more merchandise. BUT the four smaller flat pieces of steel that hold the bolt head spin inside the 2010 Chevy Express frame and torqueing to speck was not achieved. I was able to wedge 3 of the four plates with bolt to stop it from spinning and torqued to spec but left one middle one un torqued. The light kit will have to be installed when the vehicle is empty to access the panels for removal.



light kit went easy all is well thanks. One thing, keeper pin a little hard to access so far under the bumper but the hitch does its job.

2018 Ram 3500

Very easy to install on my 2018 Express 3500 Passenger. Follow this video:

I ran the right side light in a channel over the door (see pic of me pointing to it). I used an old tension rod to punch through the gasket and pull the wires through the body... no cords dangling out of my door!

I also installed the Curt Heavy Duty hitch and the 7 wire RV harness (for vans without factory wiring)... all using the video above.

2007 Chevrolet Express Van

If you can't figure out the install on this, then you should'nt be driving. Easy, fast and worth the price. I paired this with the wiring kit for trailer brakes and 7-wire harness and I'm ready to tow. 2007 Chevrolet Express AWD passenger van.


super easy to install went in no proble ms


Sal was great, got the order out same day FAST. Arrived right on time. The items were exactly what I needed to get my Van together for towing complete with hitch and wiring harness.


Excelente servicio y entrega muy rápida
Muchas gracias
100% recomiendo esta pagina



It didn’t last a 6 weeks

2018 GMC Savana Van

Both products were huge disappointment but this one was a total joke. The connectors do plug right in but the wires are too short to cleanly route or hide they have to be hanging in the air to reach - same behind the vehicle. This is worthless unless you just want the plugs, you will have to cut and buy a new flat to extend to your receiver unless you just want it all hanging from the plugs in the way of your cargo.


Works great, only wish there were more zip ties with the kit


This wiring harness was top notch! plugged up easily and quickly and did exzctly what it was intended for


Great website, easy order, experts helping in the phone, awesome fast shipping. Great company.

2003 Chevrolet Express Van

I can't even write a review because the item was stolen due to poor packaging. The item was sent with the shipping label slapped on instead of putting it in a separate box. Disappointed.

2012 GMC Savana Van

Piece of cake! Works as advertaised.


Super easy to hook up, used on a 2012 chevy express extended passenger van with the smaller engine. Hook up is in the power connectors behind the brake light on both sides, main power on drivers side, accessed behind the interior trim. Plug in main connector, loop passenger side connector over/around obstructions and plug in.

Easier than making apple pie!


Year later still great.

2019 Chevrolet Express Van

Excellent just as advertised received curt class lV and wiring # 118392 via UPS had it all installed in just over an hour


Directions are spot on.

2014 GMC Savana Van

Perfect fit, so easy to install


This harness fits right in the original wiring of the van. It was quick and simple to install.


Great wiring harness and fairly simple to hook up. My van had its issues to get it to the proper places then it's just plug it in. No splicing required.


This wiring product worked perfectly plug and play. Hardest part was running wires from inside van to the outside. There is a removable cap at bottom of body pillar under brake lights. Easiest to remove cap and run single wire up and tape harness and pull back out.
Only problem I noticed is my van was prewired so I bought wrong kit but this kit worked perfectly so I just stayed with it.
Works even better attached to the heavy duty hitch that I got from etrailer too.
You shouldn't be disappointed with this easy to install product!



Its been a year and still working without any issues.

by: 07/10/2022

The wiring harness worked out very well. I ran it in flexibale plastic conduit to protect the wires. Wire tied and electrical taped it to existing wiring harness...


etrailer did a great job as usual but the vehicle this part is designed to fit does not have any existing openings to pass the connectors through so the wires all had to be cut and spliced back. I might as well bought an inexpensive vehicle side pigtail and spliced unto the wiring harness. It would have gone faster.

Etrailer Expert

Mike L.


This particular wiring harness is meant to remain in the cargo area of the van until its needed. When you need to use it, just run it out the back doors and shut the doors. The weatherstripping around the doors is thick enough that the wires will not get pinched or damaged, as long as you avoid the door latches. Installing the harness in this manner protects the connector from damage and from moisture.

2011 Chevrolet Express Van

Easy install. This wiring harness worked well for about 6 months. Now when I hit the brakes the trailer lights do not work properly.

Etrailer Expert

Laura E.


Mark, thank you so much for your order and your feedback. The number one cause of faulty wiring harnesses is a loss of ground. To troubleshoot your wiring harness, I recommend checking out our wiring FAQ, which can be found at the following link:

Show More Reviews

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

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Nicholas E
Test Fit:
Nicholas E
Employee Shane T
Test Fit:
Shane T
Employee Randy B
Test Fit:
Randy B
Employee Joe B
Test Fit:
Joe B
Employee Jared G
Test Fit:
Jared G
Employee Brent H
Test Fit:
Brent H
Employee Robert C
Test Fit:
Robert C
Employee Conner L
Test Fit:
Conner L
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Reno H
Expert Research:
Reno H
Employee Jameson C
Expert Research:
Jameson C
Employee Brandon M
Expert Research:
Brandon M
Employee Adam R
Expert Research:
Adam R
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 Patrick B
Video Edited:
Patrick B
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
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 Alan C
Video by:
Alan C
Employee Zach D
Video by:
Zach D
Employee Jonathan Y
Video by:
Jonathan Y

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