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. Call 800-298-8924 to order Curt Custom Fit Vehicle Wiring part number C56163 or order online at etrailer.com. Free expert support on all Curt products. Guaranteed Lowest Price 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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Custom Fit Vehicle Wiring > Trailer Hitch Wiring > Powered Converter > 4 Flat > Custom Fit > Curt

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

Curt Custom Fit Vehicle Wiring

(31 reviews)

Code:   C56163



Custom Fit Product

Shipping Special

Shipping Weight: 2 pounds


Curt Custom Fit Vehicle Wiring - C56163

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
  • Made in the USA


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 5 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 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.

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.

56163 CURT Circuit Protected T-Connector Vehicle Wiring Harness

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

Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.

Video Transcript for Trailer Wiring Harness Installation - 2012 Kia Sorento

Today on our 2012 Kia Sorento, we will be installing the Curt T-Connector Vehicle Wiring Harness, part number C56163. We'll start our installation by gaining access to the back of the vehicle. Then we will need to remove both tail lights by removing the two screws that hold them in place. With the screws removed, we can remove the tail light. Just pulled the tail light straight back toward us, being careful not to break the alignment tabs. We can then disconnect the factory wiring harness from the tail lamp. Then we will set the tail light to decide. With the driver side done, we can now go to the passenger side of the vehicle and repeat that process. With The taillights out of the way, we now need to run the wires for our new wiring harness.

This is the T connector for the drivers side of the vehicle. It has the red, white, yellow, and brown wires. We are going to pull this up from the bottom of the vehicle into the tail light cavity. To do that, we are going to take an old piece of airline tubing and just feed it down underneath the car between the bumper and the rear quarter panel where the tail light sits. You do not have to use airline tubing to fish the wire up. You can use an old piece of stiff wire, or whatever you may have laying around the garage. With our guide wire now in place, we will take the harness T connector that we are running up to the tail light, we will take it onto our guide wire and pull it up. We'll just take our new wiring harness and plug it in to the factory wiring harness.

We will then take the white wire with the ring terminal, which is our ground. We will take the self-tapping screw that came with the kit, we'll then find a metal surface to drill into that will still allow us to have clearance for the tail light, and this will be our grounding point. We'll then proceed to the passenger side of the vehicle and route the wire down like we did on the driver side to pull up the other wire connector. We will then take our other T connector for the passenger side, which is the green and white wire, and we will route it over there. We will go behind the rear bumper support, and up and over the exhaust. We want to make sure we stay as far away from the exhaust as possible. With the wire ran across the rear bumper, we will tape it onto our wire guide and pull it back up the vehicle. With the wire pulled up on the passenger side, we'll go ahead and take our T connector and plug it in to the vehicles factory wiring. Now, with the wires ran for the taillights we'll go ahead and just plug the other side of our T harness into the connector on the tail light. Then we can go ahead and place the tail lights back on to the vehicle. We can move back underneath of the vehicle, we'll find a piece of sheet metal on the vehicle to mount our control box to. To do that, we will use the double-sided adhesive that came with it and just mount in place. We will then take our four pole connector, run it up under the bumper mounting tabs where we pulled our green wire through.

With wire ran, we will secure some of the slack in the wire with a zip tie. To keep the wiring up off the ground, and onto the hitch, we will take the For the four way connector, install it onto the plug, and loop the through the hitch. We can now take the black power wire that came with the kit, strip the end of it, place it into a wire connector, then we will crimp the connection. We will then take the other end, of the wire connector that we crimped our power wire on to, and then connect that to the bare wire on the converter box that we mounted previously. We will then run that wire to the front of the vehicle and that will be the connection for our battery. We will also wrap our connection with a little electrical tape for a little added security, and to help keep road debris and water out. We ran our 12 volt wire along the frame. We tried to stay as close to some of the factory wiring as possible, and made sure to come up and over the suspension to keep it from getting pinched. Along with some of our brake lines, the filler tube for the fuel tank, and all the way down the frame rail, staying close to those factory brake lines. With that black wire that leads to the battery ran underneath the car, we use that airline tubing that we used earlier, push down through the engine bay, attached to the wire, and pull it up. We want to make sure that we avoid any moving parts, or anything that might get hot and damage the wire. With the wire pulled into place, we need to cut it to length.

We're going to splice in a fuse holder, which we will connect to the battery. We'll add the connector to the end of the power wire that we pulled up, and crimp a connector onto the end of it. We will then take one end of our fuse holder, the other end of the wire connector, and make that connection. We can then take our ring terminal and place it on the other end of the fuse holder. For a little added security we'll add some electrical tape over our connections. Now we make our connection to the battery. Take our ring terminal. With the connection made, we can now insert the 10 amp fuse. We can then take some zip ties and clean up the excess wiring. We will take our ground clamp, connect it to the exposed terminal, which is for the ground. We will check the running lights, the left turn signal, the right turn signal, and the brakes. We're ready to hit the road. That's going to conclude today's installation of the Curt T Connector Vehicle Wiring Harness, part number C56163 one hour 2012 Kia Sorento. .

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 package

2011 - 2013 Kia Sorento LX I4 without factory tow package

2011 - 2013 Kia Sorento LX V6 without factory tow package

2011 - 2013 Kia Sorento V6 EX without Factory Tow Prep Package

2011 - 2013 Kia Sorento V6 LX without Factory Tow Prep Package

Customers Who Purchased This Custom Fit Vehicle Wiring Also Bought...

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56163

Average Customer Rating:  4.8 out of 5 stars   (31 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.

- C56163

by: Thomas W.04/07/2013

I gave this Curt wiring harness an excellent rating even though the initial one I received didn't work! That is because of the EXCELLENT customer service I received from Curt when I called. They offered to immediately send me a replacement at no charge, which arrived in two days. I put it in today and it's fine. Tomorrow I will call them as they asked me to and they will arrange with UPS to pick up the old one for analysis. How many companies do you know that would do this???? Most will tell you to pay to ship it back and when they receive the old one, they will send you a replacement in their own sweet time. Curt ranks #1 in my book for customer service and I would not consider buying from anyone else now! One thing to Sedona owners that isn't the fault of Curt. Don't think you're going to install this kit without a fish tape to rout the wires from inside the taillight area and down to the back of the bumper. It is IMPOSSIBLE without a tape or flexible wire. You also have to run a heavy gauge wire (supplied) from the engine compartment to the left tail light area to power the conversion box. Things are not as simple as in the old days of just spicing into existing wires. 74679

- C56163

by: DANA03/22/2013

Everything worked great. Used a 4' long fiberglass rod to push up From the bottoming thru the left taillight attached the wiring of the rt taillight and pulled thru the small hole. Then passed the free end of pole up thru the right taillight and the hard part was done. Thank u Dana 71899


Well the converter part failed after a 1.5 yrs. electric in nothing out except battery wire,called curt and because over a year would not cover it. Was told to order a 56190 to use the converter from it. I have it now and will install it tomorrow. Hope this one last a long time. Even with the problems I would buy Curt again. Dana

DANA - 09/20/2014


- C56163

by: Jeff L05/09/2014

This item was priced fairly and was shipped with an upgraded shipping to express and arrived 3 days after order was placed. Very nice of etrailer to do that. This is a quality wiring harness with good instructions and wiring schematic drawing. Everything is included including tie straps. 129703


The wiring harness is still working great after one year. I am very pleased with my purchase and will look to etrailer for my future needs.

Jeff L - 05/09/2015


- C56163

by: Amy O09/20/2013

It definately had to be connected to the battery which was a pain having to run the wires to the front of the car from the back of the car. I thought it was just as simple as plugging it into the connector in the tail light. 100734


The Hitch is working just fine, we are getting ready to use it on another long trip.

Amy O - 09/22/2014


- C56163

by: Steve M.03/19/2014

I ordered the Curt hitch and wiring kit for my 2012 (4 cyl.) Kia Sorento. Mounting to the car went smoothly and wasn’t difficult thanks in part to watching the videos. I had a friend help which was nice, especially putting the hitch up in place. The products did just what they claimed to do and were cheaper than that other big orange and white place. I like how well Curt hides most of the hitch from view. A special treat was getting up graded to priority shipping (without my request) and receiving everything in about 2 ½ days. Win/win! 121334

- C56163

by: George M.05/23/2015

Overall fit and finish is excellent. I installed the wiring kit on my 2011 Sorento. The instructions that come with the kit are basic. Watching the video on etrailers webpage explains everything perfectly. The one issue I did have is that the lenght of the cable from the T connector on the drivers side was not long enough to mount the relay box anywhere near where the video shows it. I ended up making the setup work, but it would have been much easier if the wires were a foot longer. Otherwise I am satisfied so far. 195220

- C56163

by: sparky08/21/2014

It works okay for now. This is 3rd one I installed since May as first two failed after a few uses. The first one was covered and replaced for nothing. The first two were hard wired style. 3rd one is the new plug in style I only hope the new style ones are going to last. I would have thought curt would of replaced the second one also. I ended up playing for price for two. These were in installed on a 2013 KIA Sorento. 147958

- C56163

by: GeorgeS04/06/2013

The wiring harness was easy to attach. Everything I needed to get the 4-Way flat wire connector in place was included. I have ordered another wiring kit that will allow me to convert to 7-way RV connector with an electric brake controller. I'll soon be ready to tow my Aliner Sport pop-up trailer. 74508


Thanks, Patrick. Everything is still working just fine.

comment by: George S - 04/09/2014


- C56163

by: Paul O.09/01/2013

This product is amazing. I recently had trailer wiring installed by Uhaul, and it did not work properly. Even though I purchased the 2yr wiring plan I decided against driving the 45 minutes to have them try and fix it for hours. I purchased this product and had it installed, tested, and completed in about 30 minutes. Everything works great. 97799

- C56163

by: Keith07/12/2013

This product was fairly easy to install and worked like a charm the first time. The hardest part was running the wire from the converter to the battery. I actually ran it from the battery to the converter because it was easier to drop the wire down through a gap behind the engine. 89327

- C56163

by: Heath B.06/01/2014

This product was fairly easy to install. The hardest part is routing the power wire from the taillights to the battery. The part takes about 20 minutes if the car isn't on a lift. Otherwise no problems! 133615

- C56163

by: A.J.S.05/18/2013

I just put in the trailer hitch and wiring harness which fit perfect. I am 70 years old and completed the job in about 4 hours by myself. Great product and good instructions. Thanks to all. 80883

- C56163

by: Fred M05/15/2013

Very easy to install took about 15 min. Ricky from etrailer helped me when I placed my order and he was awesome and answered all of my questions I would do business again. 80349

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by: Don R09/26/2014

This was so easy to install I started to redo it just to make sure. It took less then 30 minutes once I put the truck on a set of ramps, and it has worked perfectly. 153272

- C56163

by: Joe G04/23/2015

Service was great. Timely delivery. I hope the wiring harness works for more than a year. I haven't had good luck with this product. This is my third unit. 187635

- C56163

by: John Martin02/01/2014

I had watched a video on the installation and it was easier than expected. As other coments had said the hardest part was fishing the wire to the baery. 115403

- C56163

by: Nick F.05/24/2013

A+!!! Instructions were SPOT-ON and it was easy to follow along as the pieces fell together effortlessly. My wife thinks I'm a PRO!!! 81851

- C56163

by: Jack10/28/2014

T-Connector worked good. Had most trouble with running the wire up to the battery. Good product and was delivered in a timely manner. 158198

- C56163

by: Dennis G.08/19/2013

Easy to install works great. Tip: after installation you will read 12 volts across all of the plug terminals. 95718

- C56163

by: James B.08/14/2015

Great service received it 3 days quicker than when I was told. It doesn't get any better than that. 219369

- C56163

by: Len S.08/11/2014

Everything came in as ordered accept the hitch said SX on the box, but it fit my ex Sorento. 145716

- C56163

by: Jim H.03/23/2015

Everything works great. Relatively easy to install for an experience mechanic. 180438

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by: Jon K.07/29/2013

Extremely easy installation! Everything worked correctly on the first try. 92064

- C56163

by: Dave R06/09/2015

Got here quick, went in easy. Thanks for the how to videos made life easy 202081

- C56163

by: CHARLES G.03/11/2013

great to wirie in the kia good servive when you get the right parts. 70014

- C56163

by: Patrick04/15/2013

I had it installed today it fits perfectly and looks good 76247

- C56163

by: Jerry D10/10/2013

Worked great! About 30 Min and you ready to go. 103313

- C56163

by: james11/23/2014

fit as rquired,no problems,most parts i ncluded 162267

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by: Sam03/27/2013

Easy install, good directions,quality p roduct. 72733

- C56163

by: Ron05/19/2013

Great product. Better price than at a d ealer. 80917

- C56163

by: Doug04/19/2013

Easy connection and works perfectly. 76912


Ask the Experts about this Curt Custom Fit Vehicle Wiring
Do you have a question about this Custom Fit Vehicle Wiring?

  • Draw-Tite Versus Hidden Hitch for 2012 Kia Sorento
  • You hit the nail on the head. Hidden Hitch and Draw-Tite are manufactured by the same company, Cequent Performance Products. Both hitches are identical except for the label. Keep in mind that the hitches will not fit a dual exhaust vehicle (with pipes on both sides of the vehicle). If you are interested in a hitch with a less obtrusive appearance, the Curt Class III, part # C13073 might be a better alternative. I have edited a photo for you showing a rear view of both hitches once they...
    view full answer...

  • How To Determine If My Kia Sorento LX 4 Cyl Came Equipped With Tow Package
  • Your owners manual should indicate if your 2011 Kia Sorento came equipped with a factory tow package. You can also look under your vehicle to see if there is a connector on the driver side frame rail behind the rear tire. Typically you would not see a 4 cylinder model come equipped with a tow package from the factory. If your Kia Sorento does not have a factory tow package, you will need the Curt T-Connector Vehicle Wiring Harness, part # C56163. Part # C56163 will connect to the back...
    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, # C56163. 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...
    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...

  • Difference In The CURT Wiring Harness # 56100 and # C56151 For The 2011 Kia Sorento EX
  • The CURT T-Connector Vehicle Wiring Harness, part # C56163, is used on vehicles without a factory tow package. This harness will connect to the back of your vehicles tail lights on both sides and have a separate power wire that is run to the vehicles battery. The Curt T-Connector Vehicle Wiring Harness, part # C56151, is a wiring harness that is used if your vehicle has a factory tow package. The factory tow harness connector is located under the the driver’s side of the vehicle, on...
    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...
    view full answer...

  • Lights Stay On, 2011 Kia Sorento With Trailer Wiring Harness and Brake Controller Installed
  • I think you are correct, there is a problem with the internal circuitry of the converter box. It is not unheard of for one to go bad but when it happens multiple times on the same vehicle there could be another issue causing it to malfunction. The most likely suspect is the trailer wiring. If there is a short anywhere on the trailer it can be damaging the converter box. You can check the grounds and trailer connectors as well as the wiring on the trailer side to determine if there is...
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2012 Kia Sorento
  • The main difference between the Curt Modulite Wiring Harness, # 56146KIT, and the Curt T-Connector Wiring Harness, # C56163, is that the T-Connector harness, # C56163, simply plugs into the factory tail light connectors at the back of the tail light assemblies. The Modulite Harness, # 56146KIT, will need to be hardwired into your vehicles tail light circuits. I would recommend using the T-Connector Harness # C56163 because you will not need to cut or splice into your vehicles tail light...
    view full answer...

  • 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 # 118269 that you referenced. It will only fit the V6, towing prep models. If you have a 4 cylinder model, you would need to use # C56163. I have included links to the installation instructions for both kits for you.
    view full answer...

  • Where Does Trailer Wiring Harness C56163 Install on a 2013 Kia Sorento without Factory Tow Package
  • There are about 7 configurations of the 2013 Kia Sorento so I would need to know if it is an EX, LX, SX, or base model and if it has a 4 cylinder motor or 6 cylinder motor. This is just to ensure we can get you the correct option. Wiring harness # C56163 will fit base, EX, LX, SX models with 4 or 6 cylinder as long as they do not have the tow package. The connectors on the harness are designed to plug in line with the tail light wiring on the vehicle. I have included a link to the installation...
    view full answer...

  • No Trailer Brake Lights and Turn Signals Alternate Blinking with Wiring Harness on 2013 Kia Sorento
  • This sounds like a ground issue. To test it you will first disconnect the trailer from the tow vehicle. Then use a circuit tester like # 3808 if you need one to test the wires on the vehicle side. Start by testing the wires leading into the converter box. If the signals are not correct coming in then there is a problem with the vehicle wiring that needs to be addressed. If the signals are correct going in, move on to testing the 4-Way on the vehicle with the circuit tester. If the signals...
    view full answer...

  • 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 # C56163. 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...

  • Are the Tow Package Wiring Plugs Present on a 2012 Kia Sorento without Factory Tow Package
  • The wiring could very well be present even if the vehicle does not have the factory tow package. However, just because the wiring is there does not mean it is activated. Factory tow package wiring requires certain components that are not present in vehicles without the tow package. The Curt wiring harness # C56163 is going to be the best option if the 2012 Kia Sorento does not have the factory tow package. I have included a link to the installation instructions for you and a link to...
    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 # 118269. Without the tow package, use part # 118506. Generally speaking, the Tow Ready taillight converters have higher amperage ratings than their Curt counterparts, like the C56163. Curt make a fine wiring harness, but if I have the option, I'll choose the one with the higher rating. I've linked you to some installation...
    view full answer...

  • Pilot Brake and Tail Light Hitch Cover # CR-007A Will Not Turn Off
  • If the Pilot Brake and Tail Light Hitch Cover, # CR-007A, never goes out, then it is constantly receiving power from one of the tail light circuits coming from the vehicle. To begin troubleshooting, make sure your vehicle is turned off and the vehicle lights are off. If the hitch light stays on with the vehicle off and lights off, there is a problem. I recommend using a circuit tester, like our Quickee Tester, # 3808, to test each of the pins on the 4-way connector on your Sorento with...
    view full answer...

  • Wiring Harness Recommendation and Installation for a 2013 Kia Sorento
  • We do have some installation videos of the Curt Wiring Harness, # 56146KIT. Check out the video we have on a 2015 Kia Sorento that I attached for you. This will be very similar to the installation on your 2013 model. Instead of using a wiring harness that requires you to splice or cut into your existing tail light wiring, I recommend using a plug-in style wiring harness like the Curt T-Connector Wiring Harness, # C56163. This wiring harness will be much easier to install because it...
    view full answer...

  • Trailer Running Lights Not Working when Coupled to a 2013 Kia Sorento
  • To me it sounds like the converter is working fine and the issue is with the trailer wiring. Since you tested the vehicle side connector and it worked fine that just leaves the trailer. And since you mentioned that the ground was causing some problems during a test, I think that is the exact problem, a bad ground. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. Since it has been a while since you have used the trailer connector,...
    view full answer...

  • Curt T-Harness Malfunction on Part # C56163 for a 2011 Kia Sorento
  • In this situation, the first thing I would check is the ground connection, the white wire with the eye ring terminal. Make sure it has good metal to metal contact with the frame of the Sorento. Check the power wire that you ran from the box up to the battery. Make sure the connections are good and not loose or frayed. If this does not solve your problem you will need a circuit tester, like part # 3808, to test the input and output side of the box. The black power wire should have...
    view full answer...

  • 4-Way on Curt Trailer Wiring Harness for 2012 Kia Sorento Shows Power All the TIme
  • Yes. This is a common issue with the Curt powered trailer wiring harnesses. There will be power to the 4-Way but it should not be enough to light up the trailer lights unless they are LED lights. If you plug in the trailer and the lights do light up then there could actually be a short somewhere. Use a circuit tester like # 3808 to test the wires leading into the converter box. If the signals are correct going in but not correct at the 4-Way AND the trailer lights come on when plugged...
    view full answer...

  • Recommended Trailer Hitch and Towing Accessories for 2011 Kia Sorento
  • For your 2011 Sorento, assuming it's a US spec vehicle, I'd recommend the Curt Class III hitch, part # C13073. This hitch is compatible as long as your Sorento isn't a dual exhaust model, with an exhaust pipe on each side of the vehicle. To complete your towing setup, you will also need the following: Ball mount, part # 2923 2 inch trailer ball, part # 63845 1-7/8 inch trailer ball, part # 19260 Trailer wiring harness, part # C56163. This wiring harness will provide basic lighting...
    view full answer...

  • Comparing Curt and Tow Ready Trailer Wiring Harnesses for a 2012 Kia Sorento
  • The first difference is that harness # 118506 is not a Curt harness. It is made by Tow Ready. The Curt harness is # C56163. The harnesses do both install the same way but we hear about less problems with the Tow Ready harness # 118506. There is slight difference is the amperage rating between the 2 harnesses as well. The Curt harness is rated for Stop/turn lights: 5 amps per circuit and Tail lights: 5 amps per circuit. the Tow Ready harness is rated for Stop/turn lights: 4.2 amps per...
    view full answer...

  • 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 tail lights 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...
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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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  • Can Wiring Harness 56163 Be Installed on 2012 Kia Sorento with or without Factory Tow Package
  • The connectors being present under the vehicle does not indicate whether or not your 2012 Kia Sorento has the factory tow package. The plugs can be there but not be active. The easiest way to determine how your Sorento is equipped is to have the dealer run the VIN. They should be able to tell you what options the vehicle has. A trickier way is to use a circuit tester such as # 3808 to test the connectors you found while someone sits in the cab of the vehicle and runs through the various...
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  • Trailer Hitch and Wiring for a 2012 Kia Sorento LX
  • What is interesting about vehicles that can be pre-wired from the factory for trailer wiring is that the wiring might be there but you will not know if it is live or not. You will need to test the connectors in your picture using a circuit tester like # 3808. You will need to have someone sit in the vehicle and run through the functions while you test the connector. If it is a live connector then you can use the appropriate harness for a 2012 Sorento with factory tow package. Or you...
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  • Troubleshooting Trailer Running Lights on a 2011 Kia Sedona
  • It sounds like the problem is on the trailer side of the wiring equation since your running lights seem to work on your boat trailer, but to be sure you should test the running light of the 4-way with a circuit tester like our part # 3808. Check out the video I attached that shows how to do this. Its pretty easy, you would basically just need to turn on the running lights of your 2011 Kia Sedona and then test the pin on your 4-way that has a brown wire run to it for voltage. If its there...
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Do you have a question about this Custom Fit Vehicle Wiring?

Info for this part was:

Photos by:
Theodore B

Updated by:
Lindsey S

Expert Research:
Michael H

Expert Research:
Jameson C

Updated by:
Adele M

Video by:
Alan C

Test Fit:
Joe B

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