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CURT

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

Part Number: C56256

269 Reviews | 81 Questions

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$97.53

Retail:$133.95

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2007 Ford Edge

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curt custom fit vehicle wiring trailer hitch plug-in

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curt custom fit vehicle wiring trailer hitch end connector

curt custom fit vehicle wiring end connector 4 flat c56256

curt custom fit vehicle wiring trailer hitch plug-in t-connector harness with 4-pole flat connector

curt custom fit vehicle wiring trailer hitch 4 flat t-connector harness with 4-pole connector

curt custom fit vehicle wiring end connector 4 flat

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2015 kia sorento custom fit vehicle wiring curt trailer hitch 4 flat t-connector harness with 4-pole connector

2015 kia sorento custom fit vehicle wiring curt trailer hitch 4 flat c56256

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Videos

Curt Trailer Wiring Harness Installation - 2019 Kia Sorento

Trailer Wiring Harness Installation - 2016 Kia Sorento

Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C56256 Review

Trailer Wiring Harness Installation - 2015 Kia Sorento

Curt T-Connector Vehicle Wiring Harness Step-By-Step Install - 2020 Kia Sorento

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SCHEDULE AN INSTALLATION

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into existing wiring. Powered converter reduces strain on wiring system and is made using SMT to ensure superior performance. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56256 or order online at etrailer.com. Free expert support on all CURT products. Great prices and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.

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Reviews (269)
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CURT Custom Fit Vehicle Wiring - C56256

Highlights

Custom Fit for Your Vehicle: Works with your vehicle's wiring
Tow Without Factory Prep: 4-way flat connector powers trailer stop, turn, and tail lights.
Plug-and-Play Install: T-harness plugs inline at tail lights—no cutting or splicing needed.
Battery-Powered Converter: Draws power directly from vehicle battery to protect wiring.
Clean, Secure Setup: Uses factory trim paths for a hidden, weather-resistant connection.
Add-On Ready: 4-way plug works with 7-way adapter kits for brake controllers or charging.

Features to know about

Installs Without Cutting or Splicing: Plug-In Harness

Wiring a trailer doesn’t have to mean tapping into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the tail light connectors, giving you a clean and simple setup. No splicing or guesswork—just plug it in behind each tail light and it’s ready to go.

Draws Power Safely: Powered Converter Design

This harness uses a powered converter that draws power straight from the vehicle battery instead of the tail light circuits. That keeps the vehicle wiring protected from overload while still sending full power to the trailer lights. It’s designed for vehicles without a factory tow package, so you get reliable trailer lighting without stressing the stock wiring.

Covers the Basics for Towing: 4-Flat Connector Output

Once installed, you get a standard 4-flat trailer connector that runs your trailer’s stop, turn, and tail lights. It’s the simplest way to make sure your trailer mirrors your vehicle’s lighting for safe and legal towing. You can also add a 7-way adapter later if you need more functions like power or brakes.

Clean and Secure Setup: Factory-Like Fit Behind Tail Lights

The harness routes behind the tail light assemblies for a hidden, tidy install that keeps everything out of sight and protected from damage. With factory-style connectors and weather-sealed ends, it’s built for long-term reliability under all kinds of driving conditions.

Comparison image of Curt T-Connector Vehicle Wiring Harness models showing different plug configurations and converter boxes for trailer wiring applications.

Specs

Electrical and Compatibility

Connector type: 4-Pole Flat Trailer Connector
Vehicle compatibility: Confirmed fit for Kia Sorento (model years 2014–2020) without factory tow package
Power source: Powered Converter – draws power directly from the vehicle battery
Installation location: Plugs into vehicle wiring harness behind driver’s-side and passenger’s-side tail lights
Grounding: Requires clean, bare metal surface for ground connection
Wiring type: Plug-in T-Connector (no splicing required)
Circuit protection: Uses inline fuse at the battery connection

Functionality

Lighting functions supported: Stop, turn, and tail lights
Operation: Mirrors vehicle stop, turn, and tail light signals on trailer lights
Number of axles supported: Not specified

Installation Requirements

Tail light access: Requires removal of tail light assemblies to access harness connection points
Wire routing: Power wire must be routed from converter to vehicle battery
Recommended accessories: Dielectric Grease (part #11755) to prevent corrosion on electrical connectors
Vehicle modifications required: None (custom-fit plug-in installation)

Compatibility Notes from Manufacturer and Fit Data

Confirmed fit for: 2014–2020 Kia Sorento (without factory tow package)
Not compatible with: Kia Sorento models equipped with factory tow package wiring
Engine configurations supported: Fits both 2.4L I4 and 3.3L V6 engine configurations
Trim compatibility: Can be used with 2016 Kia Sorento LX 2.5L, EX AWD V6, and similar trims within same generation
Upgrade compatibility: Used as base 4-way connection for upgrading to a 7-way (via adapter #37185 or kit #ETBC7)

Note

Caution: Do not connect the power wire to the 12-volt accessory outlet; it must be connected directly to the vehicle battery to maintain system protection. Using an alternate power source may void warranty and compromise converter safety.

56256 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Similar to Hopkins HM11143820 and Tekonsha 118583

Installation Details C56256 Installation instructions

This Product Fits The Following Vehicles

2016 - 2018 Kia Sorento
2014 - 2015 Kia Sorento EX V6 without Factory Tow Prep Package
2019 - 2020 Kia Sorento excluding SX models
2014 - 2015 Kia Sorento I4 models without factory tow package
2014 - 2015 Kia Sorento LX I4 models
2014 - 2015 Kia Sorento LX V6 without Factory Tow Prep Package
2019 - 2020 Kia Sorento SX models
2014 - 2015 Kia Sorento SX V6 without Factory Tow Prep Package
2014 - 2015 Kia Sorento V6 models without factory tow package
2016 - 2020 Kia Sorento without Factory Tow Package

Customer Satisfaction Score:

91% were satisfied with this product

9% of customers were not satisfied

Product did not meet expectations
Wrong item was ordered
Defective

9% of customers were not satisfied

Product did not meet expectations
Wrong item was ordered
Defective

4.6

269 reviews

5 Stars		(216)
4 Stars		(30)
3 Stars		(9)
2 Stars		(4)
1 Star		(10)

by: Daniel 08/14/2026

Suspected my problem with the left signal and brake light was the harness. It was my harness I purchased 3 years ago. Hooked it up and all is well now.

by: Daniel 06/02/2026 One Year Later

This is such an easy wiring kit! Easy install...I was very impressed with how easy it was to install. Thank you!

by: Ronnie E 04/15/2025

2018 Kia Sorento

Looked up installation for my vehicle on YouTube.Piece of cake. Works great.

Ronnie E. One Year Later

4/16/2026

I havent had any problems?

Claire H.

4/16/2026

@RonnieE I'm glad the wiring harness is working well for you. Thank you for taking the time to update us on its performance!

by: Dennis 06/22/2016

2014 Kia Sorento

This is the second trailer wiring harness that I have installed on a Kia Sorento. The first was on my 2012 Sorento. This one is on my 2014 Sorento. Having used the online video installation instructions the first time around and having no problems, I went straight to the video for my 2014 Sorento. The Curt T-Connector kit makes wiring easy. No splicing, just plug in the matching connectors, mount the power converter and run a few wires for a ground and forward to your battery. Hiding the wires behind the hitch as per the instructions with cable ties gives a clean look. I also mounted a Curt plug receptacle to the hitch so that the connector is not just hanging on the safety chain holes. As you can see from the photo I believe this gives a clean , professional look.

Click to Enlarge

by: Luis 10/03/2026 One Year Later

I finally installed it this past summer and it works great!

by: Dave S 08/08/2017 One Year Later

Kia Sorento

The trailer receiver was an easy installation, installing the wiring kit in a Kia Sorento was a pain.
We have been using the package for one year with no problems. Yes, I would order from Etrailer again.
My order was shipped promptly and arrived in good condition it was excactly as described.

Click to Enlarge

by: Sean 10/10/2025

Super high-quality product at a competitive price. But etrailer’s fast service and detailed harness selection shopping tool are what drove my decision to buy here!

by: Danny 01/02/2026

2019 Kia Sorento

Best price quick delivery good item description only buying from etrailer from now on.

by: Erwin 07/25/2026

Easy plug n play

by: Mr M 03/04/2020 One Year Later

2019 Kia Sorento

Easy to install, I like how it isolates the electrical system and it works great. Your video instructions were outstanding. With the video a five year old could install the wiring. This was installed in my 2019 Kia Sorento. The first pix shows in the back very low profile, the second pix shows inside the engine compartment, truly cool.

Click to Enlarge

Mr M. One Year Later

3/5/2021

Ive had no issues at all. Works great. I did bottom-out once but it was my fault, deep ravine. The hitch seems to stabilize my rear end somewhat. Dont know if its good or bad. Forgot to mention, your wiring harness is super cool and easy to install.

by: Sid 05/17/2025

Joanne was knowledgeable and helpful,with a great attitude and personality.Installing the kit was very easy one thing I added was a toggle switch in the power line to turn power off when trailer lights aren’t being used,I’m really satisfied with the kit

by: Reed 12/21/2024 One Year Later

Fit well and solid construction. Good value

Reed One Year Later

12/22/2025

Great

by: bill axon 08/16/2017 One Year Later

The second install - a "Upgraded" system worked great. It was a plug 'n play so I didn't have to splice, solder and tape wires. Your video and printed instructions were very clear and spot on. Screwed the flat 4-pole mounting bracket to the hitch frame and used JB Weld to bond the flat connector to the mounting bracket.

thanx,
bill

Bill A. One Year Later

8/16/2018

trouble free, no problems

by: Pat a 08/22/2018

2017 Kia Sorento

Nicole T was a great saver of Get to g my vehicle ready to pull my trailer. The wiring harness I purchased thru a different supplier failed to ask a crucial vehicle option. It caused the wrong wiring harness to be purchased. I contacted Curt directly and Nicole T was on the job with her "A" game. She asked the right questions, allowing me to select the correct wiring harness. She arranged shipping to ensure I receive it as early as possible, the next day. Installation was quick & easy. Thank you Nicole T.

Pat A. One Year Later

8/22/2019

Great, it has lived up to my expectations. Again, without Nicole T knowledge of your products & ability to ask the required information, I would have had to postpone my trip & spend additional money. Thank you again Nicole T & Curt.

by: Jim H. 04/24/2018

2018 Kia Sorento

Extremely helpful video on etrailer website convenienced me to purchase this wiring harness for my 2018 Kia Sorento. Every bit as easy as pie! A well engineered harness with plenty of length on the wiring and all the plugs matched. You may need additional black zip ties on hand if you’re picky like me.

Jim H. One Year Later

4/28/2019

Installed it a year ago. Everything still works perfectly! Be sure to watch the video before you begin installation and you will be just fine!

by: Roger 02/18/2018

2016 Kia Sorento

Simple to install only thing I didn't use that was sent was the butt connectors. Personally don't like that style . Small issue with preference is all. Looks like it was factory done and not after like other wireing harness that I have seen or used.

Roger B. One Year Later

2/19/2019

Have had one issue with it in a year. My right rear marker light will stay on if I leave the in line fuse in when no trailer is connected. Simple enough fix I dont pull a trailer that much so I just pull the fuse when Im not using it. Not sure if its auto manufacturer issue or trailer wiring issue but eh not that hard to overcome

Rachael H.

2/20/2019

Sounds like this wiring harness has a bad modulite if there is still a signal on while the trailer it not connected. If your current solution of pulling the fuse becomes an issue I would recommend removing this wiring harness and replacing it with the # 118269.

by: Milt F. 03/18/2018 One Year Later

2016 Kia Sorento

Package contained everything promised in first class quality and instructions. Fit at all points was perfect and easy to install. Supplied instructions were clear and specific. I have experienced no adverse issues with the installed wiring. Highly recommend this wiring kit. My installation was on a 2016 Kia Sorento SUV.

Milt F. One Year Later

3/21/2019

After one year the unit is still functioning perfectly. Quality product all the way.

by: Andrew 02/05/2024 One Year Later

Wiring harness has quit working less than a year after purchase, one trailer brake light is always on, neither of the turn signals or the other brake light is still working.

Jenny N.

2/7/2024

It sounds like the harness has shorted out. To do a bit of trouble shooting, start by using a circuit tester to check the functions at the 4 flat connector. Also check the ground wire remains as a good solid ground to bare metal. You can then next check the signal of the wires leading into the converter box and out of the converter box. If you have a signal entering in the box and not out the other side then the harness will need to be replaced. I have a FAQ below that can help with testing the harness.

Helpful Links

faq-4-5-way-troubleshooting.aspx

by: Mike S. 01/26/2017

Fast FREE shipping, looks as though all components are included before installation.
What I like most is the VIDEO, recalling that a picture is worth a thousand words, and having worked at Kodak for 30 years, the video takes any guess work out of it.

Michael S. One Year Later

1/26/2018

It worked GREAT, right up to the point when with my 5x10 utility trailer in tow, the 2015 Kia Sorento was totaled in a sudden snow squall, when a young on coming driver lost control and spun into my lane. The trailer held fast to that hitch.

by: Alaska Mike 07/27/2019

The hitch and harness arrived 3 days before scheduled date and packed very well. Some minor rubbing on the tube, no big deal, I have paint. Dealer etrailer. Won’t install for another month, that review will follow then.

Alaska M. One Year Later

7/30/2020

Great! All connections worked as advertised! Simple and straight forward.

by: James 08/08/2024 One Year Later

I installed the kit. It worked ok for the 2-3 times I used it. I believe on the third time I used it I noticed the running lights on one side were on in even though I didn't have then on. The brake lights and turning lights were not working. I managed to get through the short trip on that day and checked all the wiring. I hadn't made any mistakes installing the kit. Next time I hooked things up the fuse had blown. I took the vehicle to my cousin who has a business for pickup trucks. He took the taillights out and said one of the wires in the harness had pulled out. He said the wire was not secured in it's place when the harness was assembled. There was no way to see that when I installed the unit. I threw the unit away and my cousin installed another brand unit.

by: JohnJ 06/11/2016

2014 Kia Sorento

The f/irst unit did not work properly for the passenger side, replacement worked perfectly. 2014 Kia Sorento i4. The instructions and the video were both very incorrect for this vehicle. The installation for the power cable is the only thing you have to follow and the video shows where I ran the cable, before I viewed the video. This unit can be installed by removing the 2 tail lights if the power cable is already ran, otherwise you only have to remove 5 plastic screw plugs to remove the cover underneath the driver side of the vehicle to run the wires. Much easier if you put the rear on ramps or jack it up. The unit plugs into the drivers tail light and all of the other cables, after the black power cable is connected and you screw in the ground cable, simply drop down and you can reach them from the bottom, even with large hands. You can shine a light underneath the vehicle if you are in a poorly lit area and can look down the tail light holes to see the opening where you will reach in and pull the wires out underneath the vehicle. It is easier with the cover removed, but I did not need to do that for the re-install nor did I do it at all for the passenger side either time. I did not have to remove any of the interior, nor mess with the grommet behind the driver side interior panel. I do not have any idea, even after repeatedly viewing the video (which is much more informative for a non-mechanic than the instructions) and re-reading the instructions. Also note, this kit is plug-n-play. No blue splicing connectors like the video shows on the same page. You unplug the tail light from the car, plug the controller in (don't unwrap the driver side wires either) to the car and the other end into the tail light. This is how simple it is. Took me 1 hour to install it the first time and 45 minutes to run the power cable because I had to figure out a safe route, which turned out to be along the round wheel panel an then the same path the video shows going forward to the battery. It took about 5 minutes to do the re-install now that I knew nothing had to be removed from the vehicle except for the 2 tail lights.
5 stars for simple installation. Wish the instructions were made for someone who has never done an install before and again I have no idea what they wanted to run through the grommet. I suppose maybe they want the passenger green wire ran inside the car instead of across the hitch??? I was not able to make out what the instructions wanted- too vague. The video is not for this kit and lacked the grommet area along with how to begin the black power cable – only shows from the front of the rear wheel to the battery and has no specific instructions on how to route it.
Oh, it also tells to disconnect the existing cables, if any, going through the grommet and to be careful not to break the plastic tabs on the connector. I was not able to figure out how to unplug the connector, but luckily none of that that was needed. If it is needed, I was not able to make out what they wanted me to do with the grommet section.
In case it helps, I would do it this way:
1) Remove the 2 taillights and place them in a safe place.
2) Connect the black power cable, run it to the battery, leaving about a foot sticking out of the tail light hole. Ensure you can always get to the but connector in the future.
3) Watch the video and ensure the ground wire and screw are EXACTLY where they tell you in the video. You must screw through 2 layers of metal and be in the area where the tail light will go back in place all of the way.
4) Do not unwrap the drive side wiring. Unwrap the other cables and drop them down the hole, reach in the whole, or remove the cover, and pull the wires underneath the vehicle.
5) Stick the unit to the same place the video shows.
6) Plug in the driver side taillight and screw it back to the vehicle.
7) Run the green wire to the passenger side. Use a pull wire or bungy cord down the hole and pull up the green wire. Connect it to the tail light and screw the light back on the vehicle.
8) The video shows large wire ties for the wiring, but there is only ONE, use it for the green wire and the 4 connector as the video shows.

by: David D. 06/13/2020 One Year Later

With the help of the etrailer install video, the installation of this product was relatively easy. One thing that I usually do with wiring harnesses is to first wrap them with quality electrical tape to provide additional abrasion resistance. Also make sure to use enough wire ties to secure the harness and keep it from being too loose in places.

I gave the product a 4 star review because the double stick tape for the module is not very tacky and losses adhesion quick. I had to find another method to keep it secure. Otherwise the harness works for the purpose as designed and I am satisfied.

by: Dylan 12/08/2025

2018 Kia Sorento

Well made, super easy, all necessary components included in package.

by: Steve S 04/05/2016

2016 Kia Sorento

I purchased the Curt Mfg No. C56256 Trailer Hitch Wiring Harness after an unsuccessful attempt to get a different Wiring Harness to work on my 2016 Kia Sorento. Bottom Line - the Curt Manufacturing Trailer Lights Circuits Design with Trailer Lights Power accessed DIRECTLY from a separate FUSED Power Line to the Battery worked well. The Trailer Lights Operational Control Signal taps into the Vehicle Tail Light connectors, this bypasses the 2 Kia Tow Lights Hookup connectors.

Attempts with the first Trailer Wiring Harness could not resolve the problem. I solved it thru 2 activities… First, by Online Research at eTrailer.com & discussion with eTrailer Technical Service Persons, including review of eTrailer Installation Videos, and Secondly, I confirmed their advice thru discussions with 3 local Trailer Hitch Installation & Service Professionals. After eTrailer purchase of the Curt Wiring Harness, I confirmed the solution & technical specification issues DIRECTLY with Curt Mfg thru their Telephone Technical Support. Outstanding Technical Support Service by both eTrailer & Curt Mfg.

I installed the Curt Mfg Wiring Harness on my new 2016 Kia Vehicle. Tail Light Signal connector installations went well (at the Vehicle Tail Lights, slightly different than eTrailer Videos - new Vehicle Designs for Tail Lights). Battery Power Line installation & Fuse at the Battery went well per eTrailer videos. Trailer Lights Power Plug function was verified per Curt instructions with the Product Kit. FINAL TEST SUCCESSFUL - 250 mile on the road “Trailer Lights test”, including about 30 miles in the RAIN. Outstanding Technical Support Service both by eTrailer & Curt Mfg. - THANK YOU.

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Why Would Trailer Wiring of 2015 Kia Sorento Cause Blow Fuses in Vehicle
Grounding issues do not typically cause fuses to blow since typically they just stop circuits from working. An insufficient ground won't overload a circuit and cause it to blow a fuse. To me this sounds like the converter box of the trailer wiring circuit has an internal problem most likely caused by a short on the trailer wiring which is now causing wiring of the harness to blow fuses. You'll have to replace the trailer wiring harness for your 2015 Kia Sorento and for that the most reliable...
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Recommended Trailer Wiring Harness for a 2015 Kia Sorento
The correct wiring harness for your 2015 Kia Sorento is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part # C56256 which will work with both 2.4L I4 and 3.3L V6 engines. I have attached an installation video of this harness installed on a similar 2015 Kia Sorento for you as well. If you would like for me to recommend any other items to complete your towing setup please let me know what those items are and I would be happy to do so.
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Determining if 2016 Kia Sorento has Trailer Package for Picking Out Trailer Wiring
For your 2016 Kia Sorento you'd need to check out the install video I attached for the Curt # C56332 and see if you can find the same install harness that is used to connect this kit. If it's there this kit works, if not then you'd need the part # C56256 instead. If for some reason you didn't have a hitch already the etrailer part # e98843 would be a great choice.
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Wiring 2016 Kia Sorento to use Curt Echo Trailer Brake Controller
The Curt Echo Trailer Brake Controller # C51180 will not actually require you use that kit for installation. What you would need to start with on your 2016 Kia Sorento instead is a 4-way connector (if you don't have one), either Wiring Harness # C56256 if your '16 Sorento does NOT have the factory tow package or Wiring Harness # C56332 if your Sorento DOES have the factory tow package. The install will be different depending on which harness you need and I have added links to videos showing...
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Is Trailer Hitch Rated for Weight Distribution Available for 2017 Kia Sorento?
There are two hitches that are a fit for your 2017 Kia Sorento though neither the Draw-Tite # 75908 or Curt # C13195 are rated for use with a weight distribution (load-leveling) system so you would be unable to use this to tow your 3,000 lb camper. I looked up your '17 Sorento's owner's manual and it does state that the maximum towing capacity for this vehicle is 3,500 lbs (for the Theta II 2.0/2.4 engine) or 5,000 lbs (for the Lambda II 3.3 engine) only if you have the trailer towing...
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Correct Trailer Hitch and Wiring Harness for a 2019 Kia Sorento EX AWD
The correct trailer hitch fit for a 2019 Kia Sorento EX AWD is the etrailer Trailer Hitch Receiver part # e98843 which features a simple bolt-on installation. Then for trailer wiring, I recommend the Curt T-Connector Vehicle Wiring Harness, part # C56332 for models with the tow package or part # C56256 for those without.
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Choosing a Wiring Kit for a 2016 Kia Sorento
The part you will want is the Curt T-Connector Vehicle Wiring Harness, # C56256, which is a confirmed fit for 2016 Kia Sorento without the factory tow package. Please keep in mind that if you plan on towing with your vehicle, you will need a ball mount and hitch ball. I have linked a help article at the bottom of the page which will help determine the correct ball mount for you. I have included links to a video review and installation of this product, as well as a link to installation...
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How to Mount a Tent with a 2017 Kia Sorento with a Bare Roof
Since the kit that involves parts # Y00421, # Y28TR, and # Y06159 in your question, I assume you have a 2017 Kia Sorento with a bare roof and no factory rails. If this is the case, while we do have a solution you can use, you unfortunately cannot mount a roof top tent to your roof. This is because all of the roof racks we carry use door jamb clamps to mount the crossbars to your vehicle. Manufacturers strongly advise against using roof racks that use this attachment style because the clips...
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How to Determine if 2015 Kia Sorento LX V6 Has Tow Package
The easiest way would be to call your dealer's service department and have them run the VIN of your vehicle. They should be able to tell you exactly how your vehicle was equipped. You could also locate the tow plug connector, which is on top of the frame member at the passenger side rear. Remove the protective cap, and use a circuit tester like # 40376 to as each tail light circuit is activated to see if the connector is active. If it is, you have the tow package, if not you do not. The...
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