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  1. Custom Fit Vehicle Wiring
  2. Tekonsha
  3. Custom Fit
  4. 4 Flat
  5. Trailer Hitch Wiring
  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 # 118396
Our Price: $40.54
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Custom Fit Vehicle 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. 1-800-940-8924 to order Tekonsha custom fit vehicle wiring part number 118396 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.
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Tekonsha Custom Fit Vehicle Wiring - 118396

  • Custom Fit
  • 4 Flat
  • Trailer Hitch Wiring
  • Tekonsha
  • No Converter

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 behind tail lights
    • 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 tail lights. You will have to remove the tail light assemblies to access this harness.

T-One Connection Location Points Behind Tail Lights

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.

118396 Tow Ready T-1 T-Connector - 4 Wire

Installation Details 118396 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 - 118396

Average Customer Rating:  4.9 out of 5 stars   (104 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.


Wiring connector caused a pin in factory harness to push partially out to cause an open in circuit to left turn signal.This led to customer return. trailer hitch mounting holes did not line up correctly. Was unable to install forward most mount bolt.

Etrailer Expert

Katrina D.


That is not good to hear! I do see that this harness is not a confirmed fit for your 2006 Chevy Silverado. I have sent your information over to customer service for them to look into a return. If you are still needing a harness for the 2006 Chevy, I would recommend part # C55384


Easy to install. It’s been nearly a year since wired and hasn’t let us down.


This wiring installed just as advertised. Between the hitch and the wiring harness I got everything installed in about an hour. I found the harness from the YouTube video for installing while looking for a wiring diagram for my van. I'm glad I found it saved me tons of time and no cutting and splicing!

2009 Pontiac Montana SV6

Excellent kit with good quality.
to Canada took a bit longer, but service center works really good.
thank you.

2008 Chevrolet Uplander

This wiring harness was very easy to install, came with detailed easy to read, and was exactly what I needed for my 08 Uplander!


Outstanding Product quality, and Installation sheet! - First, the product was perfect! Even the paint job on the Curt Trailer Hitch Receiver was as good as it gets! The hardware package was top notch as well. My order was received quicker than promised, and in perfect condition. As a former Technical Publications Engineer, I can attest that the instruction sheet was perfectly illustrated to my particular receiver, and so well documented that, no questions could arise on this installation, because everything was covered! Also, on the website, the installation and wiring videos, showed every aspect of the installations. Bravo ""!

Chevrolet Cobalt

These t connectors are the only way to go. I also got one for my Cobalt after another place completely botched the wiring job they did after I paid for a t connector. Come to find out, they didn't use one. Blown fuses and no headlights & taillights later, this solved all my problems. Easy to install and really inexpensive. The only way to go.



Thank you for the email. I havent had a single problem with either of those two items. The hitch is on a minivan, so I dont do a whole lot of towing, but its so nice to have the capability without the expense of a truck. With the hitch being so easy to install, 1 person in less than 45 minutes, I will definitely be buying my trailer products from etrailer.


Installed very easily, the on-line installation video was a big help, and as others have mentioned about the fish wire for the bolts, that was a major part of how easily the hitch went on. Has been on the vehicle about a year, despite weather and road salt, no rust has shown up anywhere on the hitch. The plug-in 4-wire trailer light harness also was a breeze - the slowest part of that was deciding where in the body to secure the wires.

2008 Chevrolet Uplander

I installed this on my 2008 Chevrolet Uplander to be able to hook up to my boat trailer. I used the universal mounting bracket that made for a nice looking set up.
The installation was not complicated and fit well. The instructions were easy to follow. The harness works very well.

2005 Chevrolet Uplander

Hitch and electrical arrived much sooner than expected in only a few days. Good quality. Kudos to etrailer Corporation!



We bought the hitch and wiring kit. Being older we had our regular garage man install. No problem installing and it has been working great this whole year. I would definitely recommend this product and company for your needs.

2007 Chevrolet Uplander

This wiring was easy to install on my 2007 Chevy Uplander. Took about an hour to install, instructions were clear. I’m a gal with little mechanic know how, if that says anything. Still working great for lighting up my trailers After a year, traveled Around town & thousands of miles with Trailer in tow and not had an issue. Very satisfied with this product!!

2005 Saturn Relay

While this wiring harness is considerably more expensive than your average 4-wire plug you'd by at the local parts store, it was a breeze to install.

Removed the tail light assemblies, plug in one side, route the wires down behind the bumper, back up the other side, plug in. No drilling, no soldering, no wire taps that often cut wires, no messy electrical tape to eventually come unglued, no elaborate wiring under panels or carpet, and no unsightly wires hanging from unexpected places.

Definitely worth the extra price. Took me 5 or 6 minutes to install on a 2005 Saturn Relay. Zip tied in some strategic locations. Tested brakes, signals, and hazards. Everything worked great!

Fast processing and quick shipping!


2005 Chevrolet Uplander

If you need to buy an item like this, buy it from a company who deals in this business - you are much more likely to get the correct item. Had to do 2 returns to larger discounted companies before purchasing from etrailer, a company who knows what they are dealing in. Thanks!


first thing very fast shipping A+++++++++
very well built trailer hitch top notch super price
very easy to install great easy to follow instructions wiring harness kit is the way to go very good direction very pleased with this trailer hitch


Received the product quickly and was able to install this harness extremely quick. The instructions were easy to follow and it took me all of 15 minutes to hook up to my current brake lights. Could use a few more wire ties but other than that I am very pleased.


This is the second trailer hitch and lighting kit I have ordered from etrailer. Both experiences were as good as can be hope for !!

2008 Chevrolet Uplander

The wiring set was a perfect fit for the 2008 Chevy Uplander and there is a great DIY video on YouTube. A person with no mechanical ability, such as myself, can have the project finished within an hour. The only difficulty is that a Torx bit (T-30) is required for the removal of the taillight assemblies. I did read that a 1/8 Allen wrench also works, but cannot attest to this.


I found this site on the web., and ordered a hitch receiver and wireing kit on Monday. . Wendsday it was delivered to my door , Wow Great service and quality products . It is on my Van in 1 hr. easy/ Peasy . LOL yes I would definatly buy from again !!!!

2009 Chevrolet Uplander

Good value and quality. Curt Hitch and Tekonsha harness fit perfectly. Instruction videos made things go a lot easier. Liked not having to drill frame.


Delivery was very prompt and I received everything as ordered in excellent condition. I referred to the installation video on You Tube and had the wiring installed and tested within 45 minutes.
It was a great experience to receive my order without any complications.

2006 Saturn Relay

This harness was great! I pulled my tail lights pluged the harness in line and I was good to go! A+


Installed a year ago. Easy installation just as shown in the video and no problems since.


Excellent service. Great product.
. Thank


Plug and play. Super easy.

Shaun S.


Everything I purchased has been working great! Fairly easy to install. Im Really happy with everything.

2005 Chevrolet Uplander

After trying another companies wireing for my vehicle that did not work, they thought I was crazy till I sent them pics of where I was supposed plug it to they said my vehicle has wireing they never saw before. I found this one and it mounted with no issues and took about 20 minutes.

Show More Reviews

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

  • Connection Point for Curt Trailer Wiring Harness 56077 on a 2007 Chevy Uplander
    I am sure you are looking in the right place but there are two possible options for what you might see. If a loose connector is not behind the driver side trim panel in the cargo area of your 2007 Chevy Uplander then it may already be connected to the tail light wiring. You would have to unplug that connection and insert the Curt wiring harness connectors in between that factory connection so the 4-Way end branches off of it. If that also is not present then you may need to pull up additional...
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  • Wiring Harness Recommendation for a 2008 Chevrolet Uplander
    Both the Tekonsha T-One # 118396 and the Curt T-Connector # 56077 wiring harnesses will work for your 2008 Chevrolet Uplander like you mentioned, and out of both options I recommend the Curt simply because it's much easier to install but still produces the same result. The Curt plugs into a factory connector while the Tekonsha tees in behind the tail lights. So both options fit your vehicle, but the Curt is just easier to install since you only need to access that one side of the vehicle. Both...
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  • Trailer Hitch and Wiring Recommendation for 2009 Chevy Uplander
    For your 2009 Chevy Uplander we have the Draw Tite Hitch part # 75278 as a confirmed fit that would work well. It installs easily, is mostly hidden, and has great towing capacities. Then for trailer wiring the Tekonsha kit part # 118396 would be a really great option that installs easily as well. Pour votre Chevy Uplander 2009, nous avons la pièce d'attelage Draw Tite # 75278 comme un ajustement confirmé qui fonctionnerait bien. Il s'installe facilement, est principalement caché et possède...
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  • Is Installation of TowReady T-One Wiring Harness Similar on 2005 and 2006 Buick Terraza
    I spoke with my contact at TowReady and he said that the installation process for the TowReady wiring harness # 118396 is the same on the 2005 and the 2006 Buick Terraza. I have included an installation video of this part on a 2005 Buick Terraza for you to check out.
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  • Installing an Electric Brake Controller in a 2007 Chevrolet Uplander with Tow Package
    From my research your 2007 Chevrolet Uplander does not have the wiring for a 7-way trailer connector or a brake controller already installed. So the # 3015-P will not work for you. In order to install a brake controller, like the Prodigy P2 # 90885 you'll need to hardwire it under your dash using our # ETBC7 kit. I've linked a video showing you this process on a 2006 Uplander. It's a different brake controller but the process will be the same. You'll also need a 4-way trailer connector...
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  • Is the Factory Transmission Cooler Good Enough for Towing
    The factory transmission cooler on just about any vehicle is not really designed for towing applications. Since transmission fluid cannot be over-cooled, I do recommend adding a supplemental transmission cooler especially when towing. Transmission coolers are not vehicle specific, but some vehicles may need a special fitting for installation. I would need to know the year, make, and model of the vehicle to determine if it needs anything special. The most popular cooler is the Derale...
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  • Hitch, Wiring and Ball Mount Kit for 2007 Chevrolet Uplander Towing Multiple Trailers
    If your 2007 Chevrolet Uplander has the 121-inch wheel base then the easiest hitch install will come with the Curt 2-inch Class III hitch # 13336 since this option is a no-drill install. This hitch and the 1-1/4-inch Curt # C12336 are the only such no-drill hitches offered. If your Uplander does not have this 121-inch wheel base then the option I suggest is the Draw-Tite # 75278 which does require drilling but costs less than others. Written instructions for all referenced hitches are...
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  • Making Brake Stoplight Switch Connection When Installing Brake Controller on 2008 Chevy Uplander
    The Uplander uses a unique wiring set-up, in that the brake stoplight switch circuit is accessed differently than is typically done. Under the dash, to the left of the steering column, is the BCM or body control module. There is a very large 52-pin connector that plugs into the BCM. In the center of the connector, a white wire can be found that can be used to obtain a good brake signal. Tekonsha issued a Technical Bulletin complete with photos that you will find helpful, to view the bulletin...
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  • Parts Needed to Tow Trailer with 2008 Chevy Uplander
    Congratulations on the addition to the family! I took a look at the online version of the owner's manual for your 2008 Chevy Uplander and it lists a maximum trailer weight of 3,500 pounds. With this in mind your van is more than up to the task of pulling your loaded boat trailer with a healthy safety margin intact. Since you will be staying well under the vehicle's limits towing the trailer shouldn't put too much stress on the transmission or engine. I do just recommend verifying this...
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  • Parts Needed to Flat Tow a 2007 Chevy Uplander
    We do offer parts to allow your 2007 Chevy Uplander to be flat towed behind a motorhome. You would need to first start with a base plate kit. For that you would want the # BX1663. In addition to the base plates, you will also need a compatible tow bar, safety cables, lighting, and supplemental braking to flat tow your vehicle. The most popular compatible tow bar is the Blue Ox Avail # BX7420. The great thing about this model is that it comes with safety cables. For lighting you can use...
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  • Trailer Brake Lights Go Out When Stepping on Brakes in a 2007 Buick Terraza
    What I think may be occurring is the power draw on the trailer that has the issue is too great for the electrical system on the 2007 Buick Terraza. When you step on the brakes there is more power going to the lights which does not allow them to illuminate correctly. If the trailer has a lot of running lights this may be causing the issue. Check the vehicle owners manual to determine how much power the tow package can handle and compare that to how much power the lights on the trailer...
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  • Draw-Tite Trailer Hitch for 2008 Chevy Uplander with 113-Inch Wheelbase
    Draw-Tite Class III hitch # 75278 is a confirmed fit on the 2008 Chevy Uplander with 113-inch wheelbase. I verified this with Draw-Tite. This particular hitch fits all styles of this vehicle year/make/model. An installation video for this item is linked for you along with a helpful article. For a 4-pole wiring harness to power trailer lights (or a lighted hitch cover like # RP86530) you can use plug-and-play harness kit # 118396. For a towing kit with ball mount and hitch balls use part...
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  • How to Determine if a Vehicle Has Enough Capacity to Tow Another Vehicle on a Tow Dolly
    In order to determine if your 2007 Chevy Uplander could tow your 1987 Chevy Silverado on a tow dolly like the # RM-2050-1 you are going to need to check the towing capacities of the Uplander in the owners manual of the vehicle as well as determine how much the truck will weigh when ready to tow.
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  • Will A Brake Controller Work On A 2006 Pontiac Montana AWD
    You can use a brake controller on a 2006 Pontiac Montana SV6 AWD. The 2006 model was renamed the Montana SV6. To install a brake controller on your vehicle you will need a 4-way at the rear of the vehicle and then use the Brake Controller 7 & 4 Way Installation Kit, # ETBC7, along with the brake controller. To install a 4-way trailer connector at the the rear of your vehicle you will use the Tow Ready T-One Wiring Harness, # 118396. This harness will plug into the back of your taillights...
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  • Trailer Hitch and Wiring Recommendation for a 2006 Chevy Uplander
    Whenever available I always recommend a Class III 2 inch hitch for vehicles as they have higher towing capacities and since more accessories are made for 2 inch hitches they offer greater flexibility as well. For that you would want the Draw Tite hitch part # 75278. I attached an install video for you to check out as well. Since you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop...
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  • Trailer Hitch, Ball Mount, Hitch Ball, and Trailer Wiring for a 2009 Chevy Uplander
    I spoke with my contact at Curt and she stated that, technically, Chevy stopped making an Uplander for the US market in 2008 so there is no 2009 model. They did continue to make them for the Canadian market which is why the Tech Tip states the hitch is for that market. However, she stated that as long as your 2009 Uplander has the 121 inch wheelbase, the Curt Hitch, # 13336 will fit. If yours does not have a 121 inch wheelbase, or you are not certain, she stated you could use Curt Hitch...
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    Let's start with a brake controller for your 2003 Toyota Sequoia. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional brake controller that senses the amount of braking the tow vehicle is applying and applies a proportionate amount to the trailer brakes. To install it will only require the # 3040-P since you have a factory 7-way....
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    On a 2009 Pontiac Montana Van the problem is that the installation of a brake controller can shut down the brake light system in the van. The red brake wire that is on the back of the brake controller is normally connected to the cold side of the brake light switch to activate the trailer brakes when the brake pedal is applied. If that red wire from the brake controller is connected to the cold side of the brake light switch on the Montana Van it will shut down the whole brake light system. I...
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  • 4-Pole Trailer Wiring Harness for 2006 Chevrolet Uplander Without Tow Prep Package
    If your 2006 Chevrolet Uplander has a tow package connector behind the rear driver's side trim panel then Curt harness # 56077 is the correct wiring harness. It sounds like you have checked and have no such connector. If there is no tow package connector there then you can still install Tow Ready 4-Pole Harness # 118396 which will instead plug in behind each of the two taillight assemblies. The linked video shows this harness installed in a 2006 Uplander like yours.
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  • Is the Full Size Spare Replaced Under the 2006 Pontiac Montana SV6 After # 13336 Hitch Installation
    Yes, the full size spare will need to be lowered to provide access to the hitch attachment points, but will fit back into its original location after installation of the Curt Class III Trailer Hitch, item # 13336. You will need to Lower the spare tire from its storage location. It will be put back in place after hitch is installed. I have included a link to the instructions for this hitch for you to review. We also have a installation video showing the installation of this hitch for you...
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    The weight of a trailer you are able to tow with your 2015 Edge depends on a couple of things. I have attached a chart from page 228 of the owner's manual that shows the maximum trailer weight you can tow based on the drivetrain and engine size. Although I was not able to find a reference to a transmission cooler being required, it is always a good idea to have a cooler installed when towing. I have attached a link to our product page for the transmission coolers we have that are a...
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  • Fitment of the T-One Wiring Harness # 118396 with 2006 Chevy Uplander
    We definitely carry that harness! That is the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118396. This harness is confirmed to fit a 2006 Chevy Uplander. I went ahead and attached an installation video that walks you through the process.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2005 Pontiac Montana SV6
    For your 2005 Pontiac Montana SV6 you would want Tow Ready Custom Fit Vehicle Wiring # 118396. I attached installation instructions and an installation video for this product for you to check out also. The Hopkins Custom Fit Vehicle Wiring # HM41365 that you referenced is designed for the older generation style Montanas and would not work on your Montana SV6.
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  • Trailer Hitch that Fits 2008 Chevy Uplander with 109 inch Wheelbase
    Yes, for your 2008 Chevy Uplander with a 109 inch wheelbase part # 13344 is a confirmed fit. I attached an install video for you to check out for more info as well. For trailer wiring you then would want the part # 118396. If you wanted to do some towing you might be interested in etrailer ball mount kit # 989900. It comes with 2 ball mounts; one with a 3/4 inch rise or 2 inch drop and one with a 2-3/4 inch rise or 4 inch drop. It also includes a 1-7/8 inch ball, 2 inch ball, hitch pin...
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