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  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

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Custom Fit Vehicle Wiring

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118392 - Custom Fit Tekonsha Trailer Hitch Wiring
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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 existing wiring - no cutting, splicing or tapping required. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118392 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.
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  • Reviews (383)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring

  • 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

Item # 118392

Installation Details 118392 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 - 118392

Average Customer Rating:  4.8 out of 5 stars   (383 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.


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.

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.


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!

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...

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.


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.

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.


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.
Stephan - 06/03/2020

2011 Chevrolet Express Van

Wow I mean literally wow. This was so easy to put up. I raced my wife me putting this on her van vs her washing maybe 6 dishes and sweeping the kitchen I beat her by a long shot. It only took me 5 minutes to install on her van and run the wire under the van to hide the wires. When they said easy they meant every bit of it. But that's to be expected when purchasing from etrailer. Hands down my goto place for all my towing and van accessories even my commuter car back and forth to work. I have purchased a few things from them and I will say I have yet to be disappointed by there products. Will always shop here for my needs.


Just installed it today. Was a very easy job and am very pleased with my purchase. Getting ready to pull the boat tomorrow and as far as I can tell everything is in perfect working order. Would absolutely buy again.

It has been working flawlessly. At this point in time I would buy again. Easy to install. Works great.
Eileen - 04/14/2022

2019 Chevrolet Express Van

The harness plugged in my express van , just like in the video. Perfect fit , took about 20 min , use caution when removing the trim panels , use a removal tool.

Still working great , all the wiring connections are inside the van , so always protected until use.
Mark - 08/21/2021
Still working great , all the wiring connections are inside the van , so always protected until use.
Mark - 08/21/2021

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.


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.
Eric - 05/21/2021


Only reason I gave it a 4, is because it was not designed to be used without closing the door on the cord. When you are not using it, you have to fold it up and out of the way till next time. The plus is it only takes about 10 minutes to install, and worked as it should

2010 Chevrolet Express Van

A real time saver for my work van, all connectors fit great, the wires could have been maybe three or four inches longer, I can't believe that GM does not offer something like this, thank for the great product and fast shipping and a good price!

Working great, very happy with this product
Bernard - 09/08/2019

2004 Chevrolet Express Van

I was ready to write a 5 star review as the hitch easily bolted on to the frame of my van. Good solid feel, fit perfect, simple, very satisfied. Same with the beginning of the wiring harness, and then a hard stop. There are no instructions for running the connector to the hitch. NONE. Not one word. The video on line was of a different model van I guess, cause that did not help either. They did not even say, "because vehicles are different you need to find a way". Like I said, not one word, almost implying you were done with the installation without running the connector to the hitch. Changed my opinion.


Easy to install. The installation video on E-trailer really helped.


Fit perfectly,fast shipping

2020 Chevrolet Express Van

Quick shipping with good communication about when to expect delivery. But the shipping label was attached directly to the product box (so what if I need to return it in it's original packaging?) and the product box is not durable enough to ship UPS. It arrived open as shown in the picture.

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


Easy to install, and loved the instructional videos you make and supply.

1999 Chevrolet Express Van

I ordered this for a '99 Chevy, you sent one for an '03. For me to return your mistake I'm expected to pay the $19 return shipping charge. First time, last time customer.


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

2007 Chevrolet Express Van

Good timely on shipping

Marty - 04/26/2022


WHAT A COMPANY!! I can look over the products and select the best part I could afford, and the best part is they have people that actually TEST the parts they sell. I settled for a complete hitch towing setup for my 2011 Chevy Express van: a class V receiver, 4 way and 7 way harnesses and a trans oil cooler. Everything was spot on, even the shipping.... employees researching and testing their products - what a concept?! I have other towing products I will need to get and they will be from etrailer.
Thanks etrailer!!

Show More Reviews

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

  • Trailer Wiring Harness Does Not Work After Installation on a 2015 Honda Odyssey
    It does sound like a weak ground connection. Instead of drilling into the sheet metal of your 2015 Honda Odyssey look for a nearby screw or bolt already in the area and try that location. Make sure any paint or coating is removed because you will need a bare metal surface on which to attach the ground wire.
    view full answer...
  • Is Wiring for the Tekonsha T-One Wiring Harness Long Enough for 2016 Chevrolet Express Van
    The Tekonsha T-One Vehicle Wiring Harness # 118392 referenced in your question will have the wire length needed to make the necessary connections behind the driver's side and passenger's side interior trim panels, while also providing a 4-way connector at the rear of your 2016 Chevrolet Express Van. You should not need any additional wiring to mount the connector at the trailer hitch location on the vehicle. I have attached a video demonstration on your 2016 Chevy Express Van so you can...
    view full answer...
  • 2010 Chevy Express 2500 Trailer Wiring Fit
    Are the taillights of your 2010 Chevy Express Van still functioning like normal? If so, then the T-One harness part # 118392 will work and function the taillights of your trailer. It's hard to say what's going on with your current setup, but if the taillights of the vehicle are working fine yet the trailer wiring isn't that normally indicates a wiring issue.
    view full answer...
  • 2008 Chevy Express 3500 4-Way Trailer Wiring Recommendation
    Easiest solution is going to be to wire in the part # 118392. Trying to track down why factory wiring isn't complete can be a headache, and since this wire kit installs by simply plugging in line with the factory taillights it will also install very easily. I attached an install video for you to check out as well.
    view full answer...
  • Correct Trailer Wiring Harness for 2005 Chevy Express
    The issue is that you have the incorrect wiring harness for your 2005 Chevy Express van. The correct fit for your 2005 Express is the T-One Vehicle Wiring Harness # 118392. I have added a link below to a video review for you to check out which shows an installation of this harness on a 2005 Chevy Express which I recommend using as a guide during your installation.
    view full answer...
  • Trailer Wiring Harness for a 2013 Chevy Express Van
    A powered converter is not required for a 2013 Chevy Express Van. Since you are looking to add a 4-Way I recommend going with harness # 118392. This harness plugs in line with the vehicle tail lights. I have linked a video showing an example installation for you. The connector is going to work. The connectors with the green wire in the trailer wiring harness go to the passenger's side and is only picking up the right turn signal/brake light circuit. The other side has a yellow wire for...
    view full answer...
    Image 1 for Image 2 for
  • 4-Way Trailer Wiring Recommendation for 2017 Chevy 2500 Express Cargo Van
    For trailer wiring for your 2017 Chevy Express Van all you need is the T-One kit part # 118392 which installs easily and is very cost efficient. Basically it installs by just plugging in line with the taillight connectors your vehicle has and it's ready to go. I attached an install video for this kit for you to check out as well.
    view full answer...
  • Trailer Wiring Recommendation for 2017 Chev 3500 Express Passenger Van
    If you are in need of trailer wiring for your 2017 Chevy Express (meaning there is none present), then you do not have the towing package and would need the 4-way harness part # 118392 which is a confirmed fit. I attached an install video for this kit on a 2017 Express Van just like yours.
    view full answer...
  • 4-Way Trailer Wiring Harness Recommendation for 2016 GMC Savana
    We have 4-way wiring solutions for your 2016 GMC Savana Van, but none that attach the style of Delphi connector you found. You'd have to install a harness like the part # 118392 which plugs in line with the taillight connectors of your van. I attached an install video for this for you to check out as well.
    view full answer...
  • Why Would Trailer Wiring Install Potentially Cause Lighting of Trailer to be Dim When Tested
    Did you check with the engine running or just with key in on position? You'd want to have the engine running so that the alternator is supplying maximum voltage to the wiring circuits of your vehicle. That will make the trailer lighting much brighter.
    view full answer...
  • Correct 4-Way Trailer Connector for 2019 GMC Savana 2500 Van
    The trailer wiring harness for your 2019 GMC Savana 2500 van will simply plug into connectors behind the trim panels inside the rear of your van, and does not have a converter. The correct wiring harness is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118392.
    view full answer...
  • Trailer Wiring for 2008 Chevy Express 3500 without Tow Package
    For your 2008 Chevy Express 3500 the Tekonsha harness part # 118392 that you referenced is your best option. This installs easily and gives you a reliable 4-way harness.
    view full answer...
  • Wiring Harness Recommendation for 2003 Chevrolet Express Cargo Van
    Yes, the Plug-N-Tow Vehicle Wiring Harness, # 31345, can be installed on your 2003 Chevrolet Express Cargo Van. The powered converter on this wiring harness gets the signals from the vehicle wiring system but draws the power to illuminate the lights on the trailer directly from the vehicle battery. I have included a link to our installation video that you may want to check out. Another option would be the T-One Vehicle Wiring Harness, # 118392. This wiring harness simply plugs into your...
    view full answer...
  • Wiring Harness Options and Installation on a 2003 Chevrolet Express Van
    There are two trailer wiring harnesses available for your 2003 Chevrolet Express Van if it does not have a factory installed wiring harness. The Hopkins Plug-N-Tow Wiring Harness, # 31345, that you referenced does require the red wire from the input side of the converter box to be ran to the vehicle battery using the included extension wire and inline fuse to work (see photo). The power wire provides power to the converter box which powers the trailer lights. I have provided a link to an...
    view full answer...
    Image 1 for
  • Trailer Connector Location for 2013 Express with Factory Wiring
    If you had a factory connector it would be located at the exterior rear of your vehicle under the bumper most likely on the drivers side. If you have that plug you will need the Hopkins Connector # 41155. If you do not have that plug you would need to run your 4-way from the taillights with the Tow Ready # 118392 wiring harness. I have linked all the wiring harnesses for your specific vehicle for you convenience.
    view full answer...
  • Where Does a Trailer Wiring Harness Install on a 2006 GMC Savana Van
    The trailer wiring harnesses that fit your 2006 GMC Savana van, see link, plug in line with the vehicle tail light wiring located behind the trim panels in the cargo area on the driver's and passenger's sides. I recommend going with Tow Ready harness # 118392. I have linked a video showing an example installation for you.
    view full answer...
  • Trailer Wiring Recommendation for a 2008 Chevy Express Van
    Both the trailer wiring harnesses you referenced have been confirmed as fits for your 2008 Chevy Express Van. Either would work well but they have their pros and cons. The # 118392 will install much easier but will not have the circuit protection. In the event of a trailer wiring short you may end up popping fuses in your vehicle or damaging the circuits. The # 31345 will be a bit more difficult to install, but it will offer some peace of mind as trailer wiring shorts won't damage the...
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2000 Chevy Express Van 3500
    For a 2000 Chevy Express Van that did not come with a factory installed trailer wiring harness/connector you can use # 118377 to add a 4-Way flat to the rear of the vehicle. It plugs in line with the tail light wiring at the back of the vehicle. I have included a link to a video showing an example installation for you.
    view full answer...
  • Easy to Install 4-Way Trailer Wiring Solution for 2009 Chevy Express Van
    We have an easy 4-way solution for your 2009 Chevy Express Van that does not have the factory trailer wiring package but the vehicle is not pre-wired for a trailer wiring connector. So instead what you'd want is the very easy to install Tekonsha 4-way kit part # 118392 which installs inline with the taillight connectors of the van. I attached an install video for this kit on a similar 2009 Chevy Express van as yours for you to check out as well.
    view full answer...
  • Recommended Trailer Hitch Wiring to Add 4-Flat to 2019 Chevy Express Van
    The trailer wiring harness I recommend for your 2019 Chevy Express Van is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118392 because of its simple installation and the strong reputation of its manufacturer, Tekonsha, of making the highest-quality wiring harnesses. As you can see by the linked instructions and linked install video of the # 118392 harness on a Chevy Express van you will only need to plug this harness in to connection points at the rear of your van,...
    view full answer...
    Image 1 for
  • Amperage of Trailer Wiring Ciricuits on 2000 Chevy Express 1500 4-Way Connector
    No. 2 Volts does not sound correct but 2 amps is within the correct range. The T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118377 is my recommendation for your 2000 Chevy Express 1500 and should give you up to 2.1 Amps on each of the turn/stop circuits and up to 5 amps max at the tail lights (brown wire).
    view full answer...
  • Wiring Connection For Passenger Side Curt Vehicle Wiring Harness on 2019 Chevrolet Express 3500 Van
    The 6-pin connector for the passenger side of the Curt T-Connector Vehicle Wiring Harness # 55540 on your 2019 Chevrolet Express is located about 8" higher behind the upper trim panel. You can follow the wiring that comes from the taillight to the correct connector. I have also included a video from the Tekonsha T-One Vehicle Wiring Harness # 118392 that shows the connector a bit more clearly.
    view full answer...
    Image 1 for
  • Where is the Brake Switch Wire for a Brake Controller on a 2019 Chevy Express 2500
    If the wire color does not match, you will need to test your wires to confirm which is the correct. This does happen fairly often and you will need something like the Circuit Tester # 40376 to see which wire has power when the brake pedal is pressed. I included an install video we did on a 2019 Express Van for you to check out, but again, if your wires do not match, you will need to test the wires to find the correct ones.
    view full answer...
  • Hitch Recommendation for a 2015 Chevy Express Van and GMC Savana Van
    Yes, the Curt Hitch part # 14090 that you referenced is confirmed to fit your 2015 Express Van by Chevy as well as a 2015 GMC Savana. This is a great hitch with a large capacity that should work well for you. Check out the install video I attached to see how it installs. For trailer wiring you will want the part # 118392. Install video attached for this product as well. For ball mounts I recommend the etrailer Ball Mount Kit # 989900. It comes with 2 ball mounts, 2 balls, a hitch pin...
    view full answer...

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