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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 # 118410
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Custom Fit Vehicle Wiring

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118410 - Powered Converter 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. 1-636-306-4830 to order Tekonsha custom fit vehicle wiring part number 118410 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 (108)
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  • Why etrailer?

Tekonsha Custom Fit Vehicle Wiring - 118410

  • 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: 2.1 amps per circuit
    • Tail lights: 5.6 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.



118410 Tow Ready T-1 T-Connector - 4 Wire - Modu-Lite

Installation Details 118410 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 - 118410

Average Customer Rating:  4.8 out of 5 stars   (108 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:
2008 Kia Sedona

I buy from these guys because of their great instructional videos. I could have gotten the same harness a little cheaper somewhere else, but I like to support high-quality service as they provide. Install took me about 3+ hours.




by:

Instructions were right on, hardest thing was running lead wire to battery




by:

Just got the trailer wiring kit (Tekonsha - model # 118410) yesterday afternoon and installed in a few hours (by myself) today. I did use the car jack to help with the wiring, but otherwise it’s pretty straight forward. The installation video for this part that’s provided on the Etrailer website is very useful. Anyhow, this wiring kit works well. I’ll write a review if I have any issue in the future, but otherwise, it works great.
Thank you to Etrailer for the great customer service, good products and instructional videos.


Comments
The product has been working well without any issues. I use my trailer regularly. I am very satisfied with this T-one product. I definitely recommend to others who are interested in getting this product.
Ray - 12/02/2020


by:
2011 Kia Sedona

The printed installation instructions were fine, although there are better ones on YouTube, including some vehicle-specific shortcuts.

This wiring harness is a replacement for the previous T-One harness, which had the controller die after only three years.

I see that there is a redesigned controller on this one. Hope it is more durable.


Comments
Working as expected, and hope to get more than 3 years of use out of this one, as was the case with the first T-One harness.
Elaine Z - 05/25/2016


by:

It does exactly as it’s suppose to do. I’ve recently added a 7-way adapter and brake controller item # 39523 and added it to this product and works outstanding. All of which came from etrailer.com as does all my hitches and wiring needs.




by:

The timely receipt of my order exemplies all that is good in on-line ordering. The product was very well packaged for shipping and most of all, I am impressed with the quality of the product that I received. In addition, the follow up installation video, is easy to follow and insures a successful installation. Many thanks e-Trailer. I look forward and intend to use e=Trailer as my future source of needed product.




by:
2011 Kia Sedona

The tow kit the dealer installed in my 2011 Kia Sedona when it was new went sour after four years, so I bought the etrailer kit to replace it, figuring that the dealer would soak me hundreds of dollars to do the job and just put in another problem kit (I discovered that the kit they put in the new car had even been tampered with). The etrailer kit was reasonably priced, came with all the documentation and parts I needed and then some, is perfectly compatible with my vehicle, and works fine.


Comments
One year later, the kit still works fine.
John Q - 06/03/2017


by:
2008 Kia Sedona

One positive, you did ship promptly. Every time I plug in the trailer the fuse to the interior lights blows, trailer lights are ok.
I paid Kia shop 100 $$ to tell me this. he tested all circuts and they were fine. I didn't have another $100 to take the trailer and try again.
This was the 3rd wiring product we ordered. the first was quickly burned out . so we bought a new trailer and tried your product, not happy. and you advertised it was exactly for this 08 Kia Sedona, custon fit you say. Any suggestions or improvements from your experts would be appreciated.
sorry no pictures.


Comments
The harness you purchased is indeed compatible with a 2008 Kia Sedona. What youve describe indicates that theres a short somewhere in the trailer wiring. Youll need to begin at the trailer connector, and trace each circuit until it terminates at its lamp. Look carefully for pinched wires and loose connections. Look for nicks, cracks and worn spots in the wire insulation. If the copper conductor grounds out to the trailer frame, youll keep cooking taillight converters or blowing fuses forever until the problem is located and repaired. Check the bulb sockets in each lamp as well. A corroded bulb socket could also cause the problem you mentioned. Ill also link you to some troubleshooting articles that you might find helpful.
-- Etrailer Expert Mike L - 01/29/2019


by:
2008 Kia Sedona

Easiest job I’ve ever done with a wiring harness, and I didn’t have access to a lift. I just hope I did it right going by the suspension. The online video didn’t show that very well.


Comments
Still going strong. It may outlast my old van.
Bob - 05/23/2019


by:
2016 Kia Sedona

Everything about my eTrailer experience has been absolutely first class, including the follow up emails, 2 of them. Due to a medical problem it's taken me over a year to complete the installation but that's on my end. I installed the hitch and wiring harness in May of 2016. I just now got to running the power wire up to the battery and finishing the job today, 8/2/17. Again, all due to issues on my end. The product, the personal assistance, and the videos made this job as easy as it could be for this 68 year old putting a hitch on a 2012 KIA Sedona by himself. Thanks to eTrailer for running a most excellent company in every regard.




by:
2008 Kia Sedona

I purchased a trailer hitch, wiring harness, brake controller and all the additional necessary wiring for my 2008 Kia Sedona. Other than issues I encountered unrelated to the items I purchased, everything installed smoothly and continues to operate as expected after 6 months. I would definitely recommend this site to anyone. In addition, their on point instructional videos made things even easier than I could have hoped.




by:
2012 Kia Sedona

Made the wiring so much easier, the kit was very complete. I did use several additional zip ties for the battery wire as I secured it in a lot of places along the under side of the Kia van.


Comments
Thanks, Patrick every thing was great and working fine. Charles
Casey R - 03/03/2015


by:
2011 Kia Sedona

The installation of this harness is easy and straight forward and took about 45 minutes to install. I would suggest watching the video about this installation.


Comments
All is working fine. The first one I bought only work for 14 months then failed. So far this one is still working.gene
Gene - 04/24/2014



by:
2008 Kia Sedona

Very good product, shipping with tracking, etc. For me, the video clip was more helpful than the written instructions for my specific vehicle.

A word to the wise for 2008 Kia Sedona owners: if you're also going to install a Hidden Hitch (70761) at the same time, be sure to watch the video for both installations first. About halfway through the wire harness install, you need to remove four plastic screws from the bumper flange. It would be a lot easier to do that before you install the hitch, as the hitch blocks the two center screws.




by:
2008 Hyundai Entourage

I got the wiring kit for a 2008 Hyundai Entourage van. It took at least 2 hours to install. Running the power wire from the battery to the left rear light was the hardest and dirtiest part. I cleaned off the under coating and hot glued the wire to the undercarriage and then put silicone over that. I didn't like the idea of the wire running near the fuel tank. Worked for me. You have to fish the wires through the bumper / body to get to the lights. It wasn't that easy to do. Also that bumper facia part is hard to get off being like jammed up under the van. Oh, I also soldered the wires, I've had problems in the past with corrosion with the crimp on connectors. Whatever, it got done and works. Sorry, no pictures, can't bring myself to crawl under there again today.




by:
2007 Hyundai Entourage

The product arrived quickly and well packaged. The directions are clear and easy to follow. I have not needed customer support.

One area could use improvement. The directions give precise directions on how to route the cable across the back of the van under the bumper skirt. The much longer run, the power line from the back of the van to the battery under the hood, simply says to route the line avoiding hot, sharp or moving parts. Suggestions for doing this would have been appreciated.

The directions also indicate that the control box, which is about the size of a playing card and the thickness of an Iphone, gets mounted below the left tail light -- it will actually fit into an existing recess in the tail light enclosure. This is a better placement because it is totally out of the weather and there is no possibility that the double sticky tape will give way and allow the control unit to drop toward the road.

In conclusion, it seems to be a well made and packaged unit which was reasonable to install (time about 90 minutes) and performs as advertised. I would recommend it to a friend.




by:
2012 Kia Sedona

prompt communication and customer servi ce.




by:

Installed the harness today very easy to install no problems. Work great. Could not be more satisfied. Thanks for the great product. Jerry


Comments
Still working well.
Jerry - 08/06/2017


by:
2010 Kia Sedona

Works well, and the video helped with the installation. Be aware that removing the taillights is not as easy as it appears in the video. You have to yank and pull and pry around to get the pins on the lights that go into grommets in the body to let go. I thought I was going to break those plastic pins until I saw that they went into the grommets on an angle. Be careful and it will be okay.




by:

Item 118410--My son installed the wiring harness for the hitch we purchase from you last week. All needed parts were included and the instructions via internet were very helpful. I needed the hitch and wiring to tow my fishing boat--all is well, Thank you!

Ron Blough




by:

Because wiring a vehicle for trailer lights was an entirely new task for me, I had some doubts it would turn out well. The instructions were very helpful and the job was successfully completed in a few hours. Working without a lift and working while lying on the floor under the van made things more difficult. I may have shorted out the battery. Be sure to disconnect the negative terminal before makeing any connections on the positive side. Bottom line is that etrailer is a good vendor to do business with.




by:
2009 Kia Sedona

After watching installation video it was quite easy to install the T-one vehicle wiring harness. When I hooked up the trailer all lights worked great. I would recommend this product.




by:

It took alittle longer than was stated but I took my time and got it done. It obviously would of been better to have it up on a hoist at a shop but all and all it went pretty good. I consumed most of the extra time in getting the wires sent down through the bumper and pulling the wires up on the passenger side up to the light. I did take off both driver side tires so I could have a better view on where to feed the black ground wire up to the battery. Thats where a hoist would be great. As I stated all and all it went great and was well worth not paying a shop to do it. The video was a great tool. Thanks to etrailer.com




by:
2009 Kia Sedona

Installed the wiring harness yesterday and had no issues with the harness itself. Have a 09 Kia Sedona and it was a pain to install the line to the battery and the line to the passenger side taillight. Getting the wire to the battery was a pain to get from the back bumper area past rear suspension. For the passenger side taillight, getting the wires up to the light was the hard part. There is a black plastic piece that goes on the underside of the bumper, took that off and it became much easier to get the wire up.




by:

The light kit went on very easy. I would like to see one thing changed. There is a power wire that has to go the length of the vehicle and this was a real pain. Took longer to run this wire than do all the other work.

But.... It does go on just like the video. Be sure to watch the video so you don't have to redo your work. Well worth the few minutes to see all the little tricks.

Kudos for Etrailer.com for these videos. Such a great help to the layman doing this stuff themselves.



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Show More Reviews

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



  • Recommended Trailer Wiring Harness for 2007 Kia Sedona
    The Curt converters do sometimes have issues, but Curt is good with their warranties if you are still within its limits. If you are ready to move onto another brand, I recommend for your 2007 Kia Sedona that you use the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118410 instead. We have had great customer reviews with this harness.
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  • Problems with Trailer Wiring Working Intermittently on a 2012 Kia Sadona
    If the wiring harness you have is the correct harness for your Sedona and is working intermittently, you can most likely solve the issue by doing a bit of troubleshooting. Check the ground wire connection first. Make sure it is attached to a clean metal surface that is free of corrosion, paint and primer. Next check the connectors to make sure none of the pins in the connectors are bent and that the connectors are fully seated an the locking tabs are engaged fully. If you cannot get the...
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  • Will the T-One Vehicle Wiring Harness Replace a Factory Wiring Harness on a 2007 Hyundai Entourage
    Yes, the T-One Wiring Harness, # 118410, will work if the factory wiring harness on your vehicle does not work. You can remove the factory wiring harness or tie it off underneath the vehicle. The T-One wiring harness uses different connection points than the factory wiring harness. The T-One harness will plug into the tail light wires attached to the tail light assembly. I have included installation instructions and a demonstration video for you to check out. The vehicle in the video...
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  • Best Way to Route Power Wire from a Tow Ready Wiring Harness # 118410 on a 2008 Hyundai Entourage
    The best way to route the power wire from the Tow Ready Custom Fit Vehicle Wiring # 118410 would be to avoid any areas that might pinch or melt the wire. So basically try to avoid moving suspension components and hot exhaust pipes. Usually down a frame rail works best, but every vehicle is different and will require a little bit of improvisation. I attached an FAQ article on how to route power wires from converters boxes also.
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  • Troubleshooting Trailer Wiring Harness on 2008 Hyundai Entourage
    The first thing I'd recommend you do is troubleshoot the wiring harness, I've linked you to an FAQ article that explains how to do this. If you confirm that the trailer wiring harness is faulty, you'd want to remove it before installing the # 118410. It's theoretically possible to simply cut the wires and remove the old converter and splice in the new one. However, the short that damaged the converter box might have been caused by a damaged portion of the remaining trailer wiring, which...
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  • Troubleshooting Trailer Running Light Circuit on a 2009 Kia Sedona That Stopped Working
    Based on what you stated it would sound like the trailer wiring harness converter box you have installed on your 2009 Kia Sedona has shorted out and is in need of replacing. What you described doing is the correct way to test a converter box for being functional. For a new trailer wiring harness you would want the part # 118410. Before you replace it you will want to inspect the wiring of your trailer to see if you can find anything that would cause the box to short out like corrosion...
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  • Does Trailer Wiring Harness 118410 Have to Be Wired to 2006 Kia Sedona Battery
    Yes, you would need to connect the power wire on harness # 118410 to the vehicle battery on your 2006 Kia Sedona. The harness comes with extra wire to go from the power wire to the battery. How you route the wire is up to you and I have included a link to an FAQ article I wrote that explains the options. I have also linked a video that shows a typical installation that should help as well. The easiest way to route the wire is under the vehicle. If you do this you just have to make sure...
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  • Will T-One Vehicle Wiring Harness 118410 Drain the Vehicle Battery
    The T-One Vehicle Wiring Harness # 118410 is not going to drain the vehicle battery unless there is something plugged into the 4-Way that is drawing power. If the power wire for the harness is touching bare metal somewhere it could be shorting and that would draw power. But if it is installed correctly and nothing is drawing power when plugged into the 4-Way then it will not drain the battery because the power has no where to go. The wire that connects to the vehicle battery has to be...
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  • Trailer Light Remain On At All Times When Connected to My 2009 Hyundai Entourage
    There should not be any wires that remain hot at all times at the 4 pole connector. If the taillight circuit is left on then the trailers taillight bulb would be on constantly but otherwise the lights should all go out when the taillights are off and the breaks and turn signals are not on. You will need to use a circuit tester, part number 3808 if you need one, to test the trailer wiring harness on the vehicle and see which wire is remaining hot at all times. Once you have the wire located...
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  • Which Wiring Harness Is Recommended For My 2008 Kia Sedona
    I would recommend the T-One Vehicle Wiring Harness, item # 118410, which is rated for trailers with more than two taillights. This wiring harness is circuit protected and draws its power from the vehicle battery and protects the vehicles sensitive circuitry. I will provide you a link to the install instructions, as well as a link to our installation video.
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  • Right Turn Signal and Brake Light not Working on T-One Wiring Harness for 2008 Kia Sedona
    My records show that you purchased the T-One Wiring Harness, # 118410, for your 2008 Kia Sedona. It is possible that the converter box shorted out on the wiring harness when the wires frayed. To see if everything is still functioning properly, I recommend using a circuit tester like # 40376 to check the functioning of the 4 way on the vehicle. I would start by testing the wires going into the converter box. The white wire is going to be your ground on this harness. The yellow wire is...
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  • Trailer Lights Go Out When Plugged into 2007 Hyundai Entourage
    It sounds like you have to much draw on the system, if you are not blowing fuses, for the car to handle the trailer lights with this wiring harness. If the connector is working properly without the vehicle lights plugged in the vehicle is not designed to handle the draw placed on it with the trailer hooked up. In this case you will need a powered wiring harness, item number 118410 for your 2007 Hyundai Entourage. This harness will supply power to the brake lights on the trailer separate...
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  • Recommended Curt Hitch for a 2007 Kia Sedona With a Short Wheel Base
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    The trailer wiring harness part # 118410 that you referenced is a confirmed fit for your 2007 Hyundai Entourage. It will work just fine on your vehicle that has incandescent bulbs and will easily work with the LEDs you have on your trailer.
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  • Troubleshooting a Possible Faulty Vehicle Wiring Harness for a 2008 Kia Sedona
    Sounds like the power converter on your T-One Vehicle Wiring Harness, # 118410, has shorted out and will need to be replaced. The converter is designed to divert the lighting signal when you turn on your lights or use the brakes or the turn signals on your Sedona. If these functions are not working properly, then the issue is in the converter box. Before you replace it you will want to inspect the wiring of your trailer to see if you can find anything that would cause the box to short...
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  • Trailer Wiring Harness for a 2011 Kia Sedona
    On the product page for wiring harness # 118410 there is a section called specs below the description. The warranty for this item is listed there and is a 1-year limited warranty. Since you are having repeated problems with the wiring harness there may be some outside factor contributing to their failure. A short circuit on the trailer wiring, corrosion on the trailer connectors, having too many lights that overdraw the harness could all be possibilities. If the vehicle just does not like...
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    Image 1 for
  • Recommended Vehicle Trailer Wiring For 2011 Kia Sodonna Mini Van
    Your trailer connector is overloading your wiring in your 2011 Kia Sedona. To protect your wiring, use a powered ModuLite that will protect your system from overload by drawing the power needed from the battery and not your electrical system. If you already have a powered converter, it sounds like it has gone bad and needs to be replaced. I recommend you use the 2011 Kia Sedona T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118410. This will connect to your vehicle...
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  • Can I Install a 7 Way Harness and a Brake Controller on a Hyundai Entourage
    Yes, that vehicle can be wired with a brake controller. The vehicle would not be pre-wired, so you would have to hardwire the controller. We have an installation instruction page that describes how to do this and I will provide a link to it below. As the help page mentions, you will need a brake controller, and 4Way Trailer harness, use T-One harness part # 118410, and a 7Way, like part # ETBC7. I will add a link to a page that has all our brake controllers.
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  • Easier to Install Trailer Wiring Recommendation for 2009 Kia Sedona
    We have pretty easy to install trailer wiring kits that fit your 2009 Kia Sedona like the Tekonsha part # 118410 which does not require splicing into your vehicle wiring but we don't have a simple plug and play kit that would plug into a port at the rear of your vehicle. I attached an install video for this kit for you to check out as well.
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    In order to tow a trailer with a 2006 Kia Sedona you'll first need to start with a trailer hitch, the Draw-Tite Max-Frame Trailer Hitch Receiver part # 75421 is what I recommend as it offers drill free installation. Then you will need a trailer wiring harness, the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # 118410 is plug-n-play. Finally, the etrailer Ball Mount Kit part # 989900 will complete your setup. In regards to towing capacity, this will be listed in...
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  • Wiring Harness for a 2011 Kia Sedona
    The wiring kit you will need for your 2011 Kia Sedona is the T-One Wiring Harness # 118410. This kit will give you a 4-way connector to to power up the lights on your utility trailer. For your trailer you can use the 20 ft. Wishbone 4-Way Trailer Wiring Harness with 30" Ground Wire # A20WB. I've added links to install videos of each of these products as well as a help article on trailer wiring which you may find useful.
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