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

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

Item # 118506
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Retail:$140.39
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Custom Fit Vehicle Wiring

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118506 - 4 Flat Tekonsha 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. Powered ModuLite reduces strain on wiring system. 1-833-496-1390 to order Tekonsha custom fit vehicle wiring part number 118506 or order online at etrailer.com. 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 (79)
  • Q & A (0)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118506

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered 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. Powered ModuLite reduces strain on wiring system.


Features:

  • 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
    • Locate connection points behind tail lights
    • Plug in T-connector
    • Run hot lead to car battery
  • Includes ModuLite to ensure that your vehicle's wiring matches that of your trailer
    • Powered module connects directly to battery to avoid overloading vehicle's electrical system
  • Constructed of 16-gauge bonded wire
  • Comes with dust cap for 4-way flat connector


Specs:

  • Maximum amperage:
    • Stop/turn lights: 4.2 amps per circuit
    • Tail lights: 7.5 amps per circuit
  • 1-Year limited warranty


Installation

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 you've plugged in the T-connector, run the hot lead up to your car battery. Connect the lead to the included fuse holder, and then connect the fuse holder to the positive terminal on your battery and insert the provided fuse.


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.


ModuLite Powered Tail Light Converter

A ModuLite power module 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. This power module functions as a tail light converter to combine 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.


With a ModuLite, your trailer's lights will be powered without overloading your vehicle's electrical system. Because the module draws power directly from your car's battery and bypasses the electrical routes that are used by a basic wiring harness, there is virtually no draw on your tail light circuits.



118506 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118506 Installation instructions

This Product Fits The Following Vehicles

  • 2011 - 2013 Kia Sorento 4-cylinder models
  • 2011 - 2013 Kia Sorento Base I4 without factory tow package
  • 2011 - 2013 Kia Sorento EX I4 without factory tow package
  • 2011 - 2013 Kia Sorento EX V6 without Factory Tow Prep Package
  • 2011 - 2013 Kia Sorento EX V6 without Factory Tow Prep Package
  • 2011 - 2013 Kia Sorento LX I4 without factory tow package
  • 2011 - 2013 Kia Sorento LX V6 without Factory Tow Prep Package
  • 2011 - 2013 Kia Sorento LX V6 without Factory Tow Prep Package


California residents: click here



Customer Reviews

T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - 118506

Average Customer Rating:  4.4 out of 5 stars   (79 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. Powered ModuLite reduces strain on wiring system.

by:

The trailer hitch & ball fit perfectly but unfortunately the wiring harness for the lights on the trailer is the wrong one, I now have to take car to trailer sales company to get wired , I don't know what that will cost but I have no choice, this trailer hitch starting with [online] & now with the wiring problem with etrailer has been one cluster mess from the beginning & I am not done yet


Comments
This harness is a fit for the 2012 Kia Sorenta SX V6 without the factory tow package. I see that you have the 2012 Kia Sorento SX V6 with the factory package and the harness for it would be part # 118269
T-One Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector
$58.34
.
-- Etrailer Expert Jenny N - 07/14/2022


by:

Watch the etrailer video on how to install this project. It made it so easy. Getting the wiring over the bumper was tricky, but I used some string, a small hose, a piece of stiff wire and my granddaughter to get it done. We installed this and the receiver hitch from etrailer and now she is setup to pull her jet ski.


Comments
There has been no issues with the wiring kit or the receiver hitch and my granddaughter is still pulling her and her sister’s jet ski around.
Victor - 04/23/2022


by:
2011 Kia Sorento

A year ago we purchased a hitch from etrailer, and also a curt wiring harness. After the curt harness failed, and etrailer sent me another one which ultimately failed (both times the right brake signal light stuck on, and would wigwag flash against the left when the left signal was used), I decided that maybe a different brand harness would be a wiser choice, but winter came and I didn't need it as we'd missed the camping season. I recently ordered this T-One unit, and found it to be much bulkier than the curt unit, but the circuit was split differently, and it felt all around much sturdier. It works great, and I look forward to hopefully getting many years of use out of it. It will be nice being able to go camping this year as a family. So looking forward to it, and the service that etrailer has provided has been second to none as always, and if you own a Kia Sorento, I would recommend the T-One unit.




by:

The hitch installed in about half an hour on a hydraulic lift. There is a good inch between the hitch and the muffler.

The wiring took over two hours hiding all the wires. It could be done in less than an hour if i had to do it again.


Comments
what model hitch do you go with? what wiring kit did you use?
-- comment by: PatS - 02/16/2015



by:
2012 Kia Sorento

I was recommended to purchase the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector Item # 118506 for my 2012 Kia Sorento by someone I spoke with at etrailer.com. Everything went smoothly except, unlike in the video, I was unable to attach the module to the inside of the bumper because, when I did, the wires to the right tail light were at least 5-6" too short to reach all the way. I had to detach the module from the inside of the bumper and let it drop as far as as it would go and even then I had to very carefully route the right side wire to get enough wire to connect and replace the right tail light. And even with that it just barely made it. Other than that the product is great.




by:
2012 Kia Sorento

This product was a replacement for the second Curt wiring harness I had on my 2012 Kia Sorento EX. Both of the Curt wiring harnesses just simply failed over time, even with being used hardly at all. Based on other reviews on this Tekonsha product I have high hopes that this is the last wiring harness I will need to install. The Tekonsha power module is definitely much thicker and is located in a better place in the taillight than the Curt power module. I set it all up and tested the 4 flat, everything worked great! Easy install, especially when you have done it twice before!


Comments
Product is working fine! No issues.
Randall W - 05/28/2018


by:
2011 Kia Sorento

The pictures are hard to see. The wire harness s too short to be able to mount the module anywhere that is easy to reach. Compared to the old one I replaced this is a terrible design. I don't know the other brand, but would not buy this one again. A little more wire would go a long way in helping to get this installed.




by:
2013 Kia Sorento

Received my hitch for my 2013 Kia Sorento in about three days after placing my order. Everything was there and in good shape. The delivery company did a job on the box but the merchandize was fine.

Only question is the instructions for the $72.00 wiring harness were a little shy on instructions but I think I can figure them out. Would be nice to see more info in the installation of the wiring harness.

Your employee Gail was very helpful and efficient and I will give your company a 9 our of 10. Keep up the good work.


Comments
How about a video? http:/www.etrailer.com/tv-install-trailer-wiring-2011-kia-sorento-118506.aspx
-- Etrailer Expert Patrick B - 09/10/2013


by:
2011 Kia Sorento

Prroduct arrived within a week. The installation videos were a tremendous help. I installed the hitch myself and use 2 hydraulic bottle jacks to raise the hitch, which is quite heavy, into position until I was able to thread a bolt in on each end. After getting the unit suspended on 2 bolts, I was able to center the hitch side to side, install
the last 2 bolts and use the jacks to raise the hitch firmly to the car frame so I could snug the boltsup. I used a short piece of 2x4 to wedge between the muffler and auto frame to give room to get a socket wrench on the last bolt to tighten it. The muffler only needed to be shoved out of the way slightly. No need to remove ot from its hangers. It would be easier to install with a helper but not difficult by myself. No need to cut bumper. Wiring was a challeng only because of difficulty of getting it threaded up the passenger side fender. You need a skinny flexible length of whatever u have to push down thru the fender till it exits below. Then tape your wire harness to it and wrestle it up to the light. I chose to route the power cable thru the car interior and that was a chore. Easier to route under car but more exposed to elements and damage. I found one wire under the dash that penetrated the firewall and was able to punch the power line thru its rubber boot seal with an awl that got the power cable into the engine compartment. The connection to the batter was easy. I recommend this hitch for the DIYer.




by:
2011 Kia Sorento

Perfect fit! I just installed today and working so far. I say that because I had installed a curt harness and only lasted a month. Unfortunately I purchased it on ebay and didn't bother trying to contact them. I'm trusting you that if I have problems I can call. Thanks for quick delivery!!


Comments
I had the same problem with the Curt harness. The first one was messed up the second day on the job, and now the second one is bad two months down the line, and I havent even had the trailer connected to it. Im taking the trailer across country in two weeks. Im going to junk the the Curt module, and buy this one. E-trailer has been great, they sent the replacement right away after the first, but Ive had enough, no more Curt products for me. Im not going to try for a 3rd strike. Especially when I know the problem isnt a result of the trailer. The curt modules just dont do it, and even despite the excellent service from E-trailer, I really dont want to have to keep crawling under my Sorento to remove the box every six months!
-- comment by: Anthony H - 09/28/2013



by:
2012 Kia Sorento

Item arrived in 4 days. All parts fit as advertised. Hardest part of installation was routing wires through the chasis, as there are some tight spots around the tail lights. While the installation video was helpful, I think some more video under the car for routing the wires would have been helpful. Installation took about two hours because of some trial and error. Overall it was not too hard of an installation. Dealer wanted $575 to install wiring and hitch on my 2012 Sorento. By installing myself, the cost was roughly $240 for the hitch and wiring assembly. The cost difference will pay for the utility trailer I have been looking to buy. Thanks etrailer for a good experience.




by:

I did not have enough wire to connect to the passenger side tail light without more disassembly of my new vehicle than I really wanted to perform. l-added jumper inline with the wiring-potential ground point. Also, in order to allow more room for the installation I made up the butt connector for the battery positive wire before mounting the harness behind the driver's side tail light. Running to the battery was fine, not professional by any means but should work. Maybe some mounts and adhesive would help to make it more professional. Works as described.




by:

Lee trailer attachment to put on the bottom of archaea to have it haul items, works wonderfully. Instructions were easy, and it fit exactly like it was supposed to. I was able to put it on myself. The only difficulty came from the nuts being so rested on my car, that I had to clean them out first. Other than that, it was a breeze and attaching the lights electric wires were just as simple. I've had no concerns.




by:

Installing the hitch wiring harness took 2.5 hours. It must be routed down behind the tail light assemblies which takes some doing. I found a YouTube video that helped allot. The written instructions could be better. The harness itself could be a little longer from the module to the passenger side tail light. If it's not properly routed under the vehicle it won't reach. Also, the online video instructions differs slightly from the written instructions. Once installed it worked fine.




by:
Kia Sorento

I've had the wiring harness in my Kia Sorento for a year now and it works flawlessly. It was also very easy to install. Always a big plus. Thanks etrailer.
Kevin R.




by:

Thanks etrailer for prompt efficient service. The installation videos are helpful for a quick, problem free install. Great products, delivery and price. Will definitely purchase from etrailer again.
Thanks Shawn




by:
2011 Kia Sorento

Installation of hitch and full wiring harness went smoothly. No issues that others had mentioned, didn't have to drill out frame or cut away at center of bumper. Also, had plenty of wire, didn't have to splice any additional...trick was to hug the inside of bumper. Watching videos helped to simplify the installation, along with a little patience. Toughest part was to fish the wiring up through the passenger side tail light opening, bent coat hanger worked well. Would strongly recommend etrailer, price was reasonable and installation straightforward.




by:

3. problems I called help about:
1.
The instructions read: 12 awg red wire out of converter module splice to the 12 awg black wire roll which is run under the vehicle to the vehicle battery. Well it wasn’t red. It was black and it was labeled 14 awg
I didn’t think it was a problem but I called help to confirm. She said it will work fine.
2. Securing the module was a pain. I could not get it secure with either the recommended method of bolting it to a body panel hole or using the double sided tape.
Instead I zip tied it using the body panel pin fastener hole.
3. The green/red wire leading to the passenger side rear light is about 12” to short. Took a lot of wiggling and pulling and refiguring the place to secure the module attachment. This took the majority of my install time.
I called about that as well.
Hoping this product lasts 20 years.
2012 Kia Sorento ex, 4 cylinder.




by:

Great product.. Katie at etrailer was a life saver. She was very informative and got me the help I needed.


Comments
Part works great after over a year later
sparky - 05/26/2016


by:
2012 Kia Sorento

Great product, well made... videos are very helpful, as are the instructions. The only part I had a hard time with was pulling the fascia back to fit the converter box down inside. I actually pulled out the other two screws and yet didnt feel like enough room but did eventually drop in... lights work great
Curt light harness is junk, buy this one... it works !!!




by:
2011 Kia Sorento

All worked well but the harness wires to the passenger tail light did not reach. I had to splice additional wire from the old harness. UHaul had to do this same extension with the harness kit they originally installed. There's nothing unique about my Sorento so I'm not sure why this happened twice.




by:
2012 Kia Sorento

Good wiring kit. Easy enough to install, but you would think with all the reviews about the rear passenger side wiring being too short, they would change the manufacturing to add 2 foot of wire. Adding splices just adds a weak point in the system and the customer shouldn't have to do that for the price paid.
etrailer's shipping was fast and no problems dealing with the sale.




by:
2013 Kia Sorento

This was perfect and fairly easy to install. I'm very pleased with my purchase and recommend this for anyone that has a non-factory tow package on their 2013 Kia Sorento.


Comments
Fabulous!! I just used it again this past weekend to haul furniture on a trailer and it is still working great!! Im so happy that I bought and installed this on my Sorento.
Knudsen, B - 09/16/2019


by:
2011 Kia Sorento

Prompt order processing and delivery. Product easy to install (2011 Kia Sorento). Saved about $450.00 from what the dealer quoted by installing the hitch and wiring harness ourselves. Install videos were a great help. Thanks etrailer!!




by:

the wire coming out of module was not red, but black in color. The detailed instruction to remove push pin from drivers side taillight to accommodate installation of module with provided bracket was bull, because their was no bracket only a cheap piece of 2 sided tape that would not stick to anything. It was obvious after talking with a lady at e trailer that the direction were written either for a previous version of harness or as she stated could have been another manufacture. We call that n.c.p.( non complying part) in the auto industry. The harness did work after installation. Unit came from Mexico.



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Show More Reviews

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



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    For your 2012 Kia Sorento LX V6 without factory tow package, I recommend the Tow Ready T-One Vehicle Wiring Harness # 118506. This wiring harness plugs into the factory wiring behind the taillights, so you will not need to splice into the existing wiring. Since the wiring harness has a powered converter, the power wire for the converter will need to be attached to the vehicle battery. This powered ModuLite works to reduce the strain on your vehicle's wiring system. The white ground wire...
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  • Recommended Trailer Wiring With Powered ModuLite For 2012 Kia Sorento
    For your 2012 Kia Sorento, I recommend the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118506 for your vehicle's trailer wiring. As you stated, this will require a power line run directly to the battery as well as the quick connection plugs that will connect to the factory wiring behing the tail lights. This will not give constant power to the trailer, it will only draw power when the vehicle lights are on. The ModuLite will draw power from the battery in this...
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    Before purchasing you are going to want to determine if the vehicle has the factory tow package or not. The definitive way to determine this is to contact a Kia dealer and have them run the VIN and they will be able to tell you how the vehicle is equipped. Then you can order the correct harness. With factory tow package use # 118269 Without factory tow package use # 118506 I have included instruction links for the wiring harnesses for you.
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    If you have the 2011 Kia Sorento Base I4 without factory tow package or EX I4 without factory tow package, then part # 118506, is the correct trailer wiring harness to provide a 4-way flat trailer connector at the rear of your vehicle. It sounds like there is a ground issue that is causing the malfunction. First, you can do some tests on the vehicle side to see if it is the problem or if it is on the trailer. You will need a circuit tester like # 40376 if needed to test the wiring. Disconnect...
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  • What is the Correct Trailer Wiring harness for a 2012 Kia Sorento 4 Cylinder
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  • Tips for Routing Trailer Wiring Harness Power Wire to Battery on a 2011 Kia SOrento
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  • Will the T-One Wiring Harness Part 118269 Work with my 2011 Kia Sorento LX Base Model
    Thanks for sending us some pictures! Yes, the T-One wiring harness # 118269 will work with your 2011 Kia Sorento LX V6 engine with the tow package. If you have the LX 4-cylinder engine without a towing package, then you will need the T-One wiring harness # 118506. Most base model Kia's won't come with a tow package so I would double-check to see how your vehicle is equipped. Since you are adding a wiring harness, I recommend using a small amount of dielectric grease like # 11755 to help...
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    Image 1 for Image 2 for
  • Recommended Wiring for 2013 Kia Sorento LX with 4 Cylinder Engine
    If your 4 cylinder 2013 Kia Sorento LX does not have the factory tow package, I recommend the Tekonsha T-One Vehicle Wiring Harness # 118506. This is confirmed to work with your vehicle and will allow you to install a 4-way connector needed to power your trailer's signal lights. The plug-in locations for installation are behind the driver and passenger side tail lights. I have attached the installation details for you to check out. If you do not yet have a trailer hitch installed on your...
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  • Trailer Hitch Recommendation for a 2011 Kia Sorento
    The easiest way to know for certain whether a vehicle has the tow package or not is to check with a Kia dealer with your VIN. With that info they will know all of the options your vehicle was built with. Typically the tow package will include a trailer hitch at the rear of the vehicle and a trailer wiring harness like a 4-way or a 7-way. It looks like you are looking for a trailer hitch for your 2011 Kia Sorento EX. The good news is that the Draw Tite hitch part # 75684 would be the correct...
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  • Trailer Hitch Recommendation For 2011 Kia Sorento
    I did some research and it seems the Sorento that was manufactured in 2010 is in reality a 2011. I verified this with our suppliers. The Draw-Tite Max-Frame Trailer Hitch, part # 75684 you came from will work great on your Sorento. This is a Class lll trailer hitch and it has a 2-inch receiver opening. If you plan on doing 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...
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  • Circuit Tester to Use to Test Pins of 4-Way
    If you are trying to test the pins of the 4-way on the part # 118506 for function the # PTW2993 would work well for this. Or if you were trying to test for voltage on the wires of the harness this would work well too. I attached a video that shows how to test the pins of a 4-way as well.
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  • Recommended Trailer Wiring Harness for 2011 Kia Sorento
    For your 2011 Kia Sorento LX, I'd recommend using the Tow Ready Trailer Wiring Harness, part # 118506. If you click the provided links, you can see an installation video and current pricing for the harness. For shipping rates and times, add the product to a shopping cart and click the 'Calculate Shipping' link. Input your zip code into the provided field, and you'll see all the shipping options with their associated costs. We can ship overnight if needed.
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    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 Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Brandon M
Expert Research:
Brandon M
Employee Adam R
Expert Research:
Adam R
Employee Zack K
Video Edited:
Zack K
Employee Jacob T
Video Edited:
Jacob T
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 Jonathan Y
Video by:
Jonathan Y
Employee David F
Test Fit:
David F

At etrailer.com 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.


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