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

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

Item # C56328
Our Price: $73.71
You Save: 40%
Custom Fit Vehicle Wiring

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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 C56328 or order online at 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 (38)
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CURT Custom Fit Vehicle Wiring - C56328

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • CURT

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.


  • 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 a tail light converter 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 using surface-mount technology (SMT) for consistent, reliable performance
    • Maximizes trailer light yield and intensity while producing minimal heat
    • Ensures superior operation in rough road conditions
  • Comes with dust cap for 4-way flat connector


  • Maximum amperage:
    • Stop/turn lights: 3 amps per circuit
    • Tail lights: 6 amps per circuit
  • Limited 1-year warranty


This custom-fit T-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. 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.

Once installation is complete, the 4-way connector will be stowed in an out-of-the-way location within your cargo area.

It is recommended that you use a small amount of grease on all electrical connections - the plugs on your automobile and the 4-pole connector itself - to help prevent corrosion.

Powered Tail Light Converter with Surface-Mount Technology

A tail light converter is built into this T-connector. This converter is a circuit-protected, battery-powered unit that bypasses the electrical routes that are used by a basic wiring harness. As a result, there is virtually no draw on your tail light circuits.

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 the trailer. This converter combines 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.

Curt builds each tail light converter using surface-mount technology (SMT). This method of construction involves soldering electronic components directly to the surface of a printed circuit board. SMT eliminates the need for leads, which are used in older through-hole technology. The result is a circuit board that is smaller yet provides more routing area and that offers superior performance, reliability and durability.

Curt SMT Circuit Boards

Circuit boards constructed using SMT have been shown to perform better under rough conditions with excessive vibration than those made using the through-hole method. And where would vibration be more likely to occur than in towing applications? Curt converters also produce less heat, leading to increased durability and longer life. In addition, lower levels of resistance ensure better performance, especially for parts that operate at higher frequencies.

Each Curt circuit board is made using high-quality components that are pieced together in the most technologically savvy fashion, leading to greater predictability and reliability in functioning.

56328 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Replaces 56163

Installation Details C56328 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 Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56328

Average Customer Rating:  4.8 out of 5 stars   (38 Customer Reviews)

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.

2011 Toyota Matrix

Fairly easy to install. Just plugs in. Only complaint is the driver's side wiring harness is about 6" short in my opinion. The control box lays on top of bumper support because the harness wasn't long enough to allow control box to come down to be mounted like instructions said. The bumper support on the Kia is an open matrix structure, so there isn't anyplace to mount the box to on top. If the harness was 6" longer, it could have been solid mounted to the forward facing side of the bumper support.



After a year, no issues. Harness still works fine. Not had any issues with lights working once plugged in.

Etrailer Expert

Mike L.


@Greg We happy to hear that your # C56328 Curt trailer wiring harness is still working well for you.


Good quality, manual showings step by step instructions,
Mach my vehicle 2012 Kia sorento LX 2.4 l,

If possible to add where to connect positive inside fuse box under the hood to instructions will help others


Nice harness easy to install and the directions were accurate


This worked perfectly and was easy to install. One year later and it still works great.


This wiring kit makes the job much easier. Like others though, I do wish Curt would a few inches of wire to the passenger side of the harness. All connections fit like factory.


Very pleased with the product, the service, and the technical advice available. Would definitely recommend to friends.

2013 Kia Sorento

It was so easy to find the correct trailer hitch / tow package I needed for my car! The order came very fast, and the staff were very quick to respond to my questions! I returned one item (my husband wanted to get a different one for his car), and thy were super helpful with the return as well as the new item!! Overall, it was a great and easy experience!!

2011 Kia Sorento

Perfect fit, great online tutorial on YouTube, quality parts.

2012 Kia Sorento

Wiring harness installs rather easily. It would be better if the wires were longer going from the driver side tail light connection to the module to allow more room for attaching it to the chassis.


Works well. Some problems with the fuse adaptor that pulled out of its connector. I have to hot-wire it, but I can deal with that.

2013 Kia Sorento

I have reordered the right harness. I received the wrong information from the car dealer I bought the vehicle from. Tyler was very helpful with my reorder. I don’t have the hitch on yet so no pics at this time.


Made well and simple installation.


Super easy installation, got the wiring done in 20 minutes and everything works perfectly. The only complaint I have is that I paid for two day shipping and got it in three days. Don’t know whose fault this is but when a person pays for something expedited the expect to get what they pay for, otherwise could t be happier.

Kia Sorento

Working well one year on in my Kia Sore nto.


This wiring was for our back-up tow vehicle, so we only recently used it. Worked great, and no issues!


Easy to install works great and still going strong.

2011 Kia Sorento

excellent instructions. perfect fit.

2011 Kia Sorento

Great product easy Internet site




works great


Very easy to install, haven't had any trouble with it works great


Worked liked a charm. It's a year later and no problem.



Son yet to install



Great service and great products

Show More Reviews

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

  • Why Would Trailer Wiring Have Brake Lights Active All the Time
    This is typically a sign that the converter box of your trailer wiring kit is shorted out and in need of replacing. The converter boxes are designed to "fall on the sword" of a trailer short and act as a one time fuse that prevents the short from potentially affecting the vehicle wiring.
    view full answer...
  • 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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  • What is the Correct Trailer Wiring harness for a 2012 Kia Sorento 4 Cylinder
    The correct wiring harness for a 4 cylinder 2012 Kia Sorento is # C56328. The other kit you have referenced, # 118506, is not a verified fit for the 4 cylinder 2012 models. I have included a link to the installation instructions for you to view.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2012 Kia Sorento V6
    The only wiring harness for a 2012 Kia Sorento that does not require a direct connection to the battery is # 118541, but it only fits models that have the factory tow package. If the vehicle does not have the factory tow package, you will need to use Tow Ready Wiring Harness, # 118506 or CURT Wiring Harness, # C56328. With either of these harnesses, a few customers found the green wire (for the passenger side tail light) to be a little short. One customer did find an alternate route behind...
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  • Trailer Wiring Harness Options for a 2012 Kia Sorento EX
    There are 2 different wiring harnesses available for the 2012 Kia Sorento. If you have a V6 model with a factory towing prep package, you can use harness # C56332 that you referenced. It will only fit the V6, towing prep models. If you have a 4 cylinder model, you would need to use # C56328. I have included links to the installation instructions for both kits for you.
    view full answer...
  • Trailer Wiring 4-Way Kit for 2012 Kia Sorento without Tow Package
    Since your 2012 Kia Sorento didn't come with a factory hitch it's a safe assumption you don't have the factory tow package for picking out trailer wiring. If you have an EX or LX model you'd want the part # C56328 or if you have an SX model you'd want the part # C59236.
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  • Trailer Wiring Harness Recommendation for a 2012 Kia Sorento
    The main difference between the Curt Modulite Wiring Harness, # C59496, and the Curt T-Connector Wiring Harness, # C56328, is that the T-Connector harness, # C56328, simply plugs into the factory tail light connectors at the back of the tail light assemblies. The Modulite Harness, # C59496, needs to be hardwired into your vehicles tail light circuits. I recommend using the T-Connector Harness # C56163 because you will not need to cut or splice into your vehicles tail light wires. Both...
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  • Comparing 4-Pole Wiring Harness Kits for 2013 Ford Escape
    The Curt # C56328 and Tow Ready # 118566 4-pole wiring harnesses that fit your 2013 Ford Escape are very similar powered-type wiring kits. They both include all of the parts required for installation and both are mostly plug-in type products. Both only require you to run one single wire up to the engine compartment, the wire that brings the 12V power to the harness to operate the trailer's lights. Both will protect your Escape's wiring from the risk of a short-circuit that could be caused...
    view full answer...
  • Wiring Harness Recommendation and Installation for a 2013 Kia Sorento
    We do have some installation videos of the Tekonsha Wiring Harness, # 119250KIT, but we have not had a chance to install it on a Kia Sorento yet. I've attached an installation video on another SUV, BMW X5 for you to check out. Keep in mind, the wire locations and colors are likely different from your Kia, so you will only want to use this video as an example of what the installation will involve rather than step by step instructions for your Kia. Instead of using a wiring harness that...
    view full answer...
  • Wiring Harness Install Video for 2012 Kia Sorento Base I4
    While we do have a video of a trailer wiring harness installation on a 2012 Kia Sorento, it is not for the Curt T-Connector Vehicle Wiring Harness # C56328. Instead, the video we have, which I have linked for you below, is of an installation of the Tekonsha T-One Vehicle Wiring Harness # 118506. Between the two harnesses, I highly recommend going with the Tekonsha for your 2012 Sorento. Not only have they proven to have the far more reliable harnesses, it also has the highest amp rating...
    view full answer...
  • Troubleshooting Turn Signal and Brake Lamp Circuit in Trailer Taillight Wiring
    The first thing you'll want to check is the trailer connector on the vehicle. You can use a circuit tester like # PTW2993 on the pins for the right/left turn as a helper activates them. If you're getting signal for right/left turn and the brake lamps on the pins of the 4-pole trailer connector fed by the yellow and the green wires, then the problem exists in the trailer wiring. If you're not getting signal on those pins, be sure that the taillight converter harness has been plugged in...
    view full answer...
  • Is Draw-Tite Trailer Hitch 75684 For 2011 Kia Sorento a Class 3 or Class IV Hitch?
    The Draw-Tite # 75684 you were looking at is a Class 3 hitch, not a class IV and would be the correct option for your 2011 Kia Sorento. If you're going to be towing you'll also want to pick up a wiring harness # C56332 if you have the factory tow package v6 engine, or # C56328 if you have an I4 engine.
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  • What Is Included On The 2013 Kia Sorento V6 EX Factory Tow Package
    The factory tow prep package on a 2013 Kia Sorento V6 EX is equipped with a pre-wired trailer wiring harness and larger transmission cooler. In order to tow a trailer with your Sorento, you will need a hitch receiver such as the Curt Trailer Hitch Receiver part # C13073, which will fit models with and without the towing package. You will also need a trailer wiring harness to attach to your factory harness such as the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package part...
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  • Recommended Wiring Harness for a 2012 Kia Sorento LX 2.4L
    Since you have the 2012 Kia Sorento LX with 4 cylinders, you will need to use the Curt T-Connector Vehicle Wiring Harness # C56328 if you are wanting to stick with the Curt brand. The wiring kit 56151 that you referenced in your question is only compatible with the 6 cylinder 2012 Kia Sorento LX. For the Curt Wiring Harness # C56163, you will simply install the connectors behind your tail light housing and run the 12V power wiring up to your battery. I have attached a video of the similar...
    view full answer...
  • Parts Needed to Tow Trailer with 2013 Kia Sorento LXI4
    Everything you mentioned would be all you need to tow the trailer you mentioned. The Draw Tite hitch # 36511 is a confirmed fit for your 2013 Kia Sorento as well as the Curt trailer wiring harness # C56328. The ball mount # 36051 is the correct one to use and so is the hitch ball # 19256.
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  • Side Marker Lights and Tail Lights Stopped Working on 2004 Aliner Sport Trailer
    It sounds to me like you may actually have a ground problem. Often if a trailer has a weak or marginal ground connection it will be able to pass enough current for the lower current draw lights, such as the turn signals, but not enough for the side marker and taillights which are always on. To begin the troubleshooting, I would start with the easiest step first and check the connectors on both your 2012 Kia Sorento LX and the trailer. Make sure that they are clean and free of dirt and corrosion...
    view full answer...
  • Best Trailer Wring Options for 2011 Kia Sorento EX V6 AWD
    The trailer wiring harness you need will depend on whether or not your Sorento is equipped with the factory tow package. If you have the tow package, I'd recommend part # HM11143965. Without the tow package, use part # 118506. With the correct harness, you will be all set. I've linked you to some installation videos that you might find helpful.
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  • Parts Needed to Convert 4-Way Trailer Wiring to 7-Way RV Connector on a 2011 Kia Sorento
    We have a kit that is designed to convert the 4-Way flat wiring harness, # C56328, to a 7-Way RV style connector for towing your new camper. The Electric Brake Controller Installation Kit, # ETBC7, is a complete kit and Includes the seven pole round RV style connector, and all of the wiring, connectors and circuit breakers that you will need to complete the wiring. We also have detailed instructions and a video showing how to install this kit, see links. The vehicle in the video is different,...
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  • Trailer Wiring Harness for 2011 Kia Sorento
    The correct Curt trailer taillight wiring harness will depend on if your Sorento is equipped with the factory tow package. If it doesn't have the tow package, use # C56328, unless it's the SX model, which would use the # C59236. If it does have the tow package, it would use # C56332. The Curt # C56131 you'd looked at is a fit for the Kia Forte, and wouldn't work on your Sorento. I've linked to some installation videos that you might find helpful.
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  • Wiring Harness and Brake Controller for 2013 Kia Sorento
    The easiest to install brake controller option for your 2013 Kia Sorento would be the Curt Echo Wireless Brake Controller, part # C51180. The controller would connect wirelessly to your smart phone, and use your phone as the control unit for the brake controller. To install the Echo, you'll first need to install a 4 pole trailer connector, part # C56328 and our Brake Controller Installation kit, part # ETBC7L. The kit includes the adapter for converting the 4 pole to a 7-way and the wire...
    view full answer...
  • Recommended Towing Package For 2011 Kia Sorento 4 Cylinder
    If your 2011 Kia Sorento does not have the dual exhaust system with a tailpipe on both the driver and passenger side, I recommend the Draw-Tite Class ll Hitch, part # 36511. This hitch has a 1-1/4 inch receiver opening. I have attached an installation video for this hitch on a Sorento you can check out. You may be interested in a Draw-Tite Ball Mount like part # 36051. This drawbar provides a 5/8 inch rise or a 1-1/4 inch drop and measures 7 inches from the center of the hitch pin hole...
    view full answer...
  • Recommended Hitch Receiver for 2015 Ford Escape to Allow Use of Lift-Gate Sensor
    The Curt Class III hitch # C13186 as well as all others that fit your 2015 Ford Escape will block the central lift gate sensors, leaving active only the sensors to either side of vehicle near the exhaust pipes. No hitch for your Escape avoids this and we do not have a relocation kit for the sensors. At least one hitch maker is investigating this possibility but no products/kits are available yet. You'll still be able to operate the auto lift gate by triggering one of the side sensors. To...
    view full answer...
  • Curt Hitch Recommendation for a 2012 Kia Sorento that is Compatible with a Full Size Spare
    The Curt Hitch # C13073 is compatible with your vehicle and allows a full size spare to be used when in installed. Check out the picture I attached that shows this hitch installed on a vehicle similar to yours and a full size spare underneath the rear of the vehicle. I attached installation instructions and an installation video for this product for you to check out also. To complete your towing setup you may be interested in the following products: Curt Custom Fit Vehicle Wiring # C56328...
    view full answer...
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Amanda M
Written by:
Amanda M
Employee Jonathan Y
Video by:
Jonathan Y
Employee Conner L
Test Fit:
Conner L

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