Curt Powered Tail Light Converter Kit with 4-Pole Flat Trailer Connector

Curt Powered Tail Light Converter Kit with 4-Pole Flat Trailer Connector

Item # C56190KIT

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Curt Vehicle End Connector Wiring - C56190KIT
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Install a 4-way flat on your vehicle with this splice-in harness. Kit includes the necessary wiring to connect the module to your car battery for power. SMT construction ensures superior performance. Works with 2-wire and 3-wire systems. Lowest Prices for the best wiring from Curt. Curt Powered Tail Light Converter Kit with 4-Pole Flat Trailer Connector part number C56190KIT can be ordered online at or call 800-298-8924 for expert service.
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Curt Wiring - C56190KIT

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • Curt

Install a 4-way flat on your vehicle with this splice-in harness. Kit includes the necessary wiring to connect the module to your car battery for power. SMT construction ensures superior performance. Works with 2-wire and 3-wire systems.


  • 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)
  • Ensures that your vehicle's wiring matches that of your trailer
    • Works with 2-wire and 3-wire electrical systems
  • 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
  • Resists water and vibration
  • Connects directly to your vehicle's wiring with the included quick-splice connectors
    • Color-coded wires and wiring guide ease installation
  • Includes battery power wire, ring terminals, and butt connectors needed to connect module to car battery for power
  • Comes with dust cap for 4-way flat connector
  • Assembled in the USA


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


To determine where to splice into your vehicle's tail light wiring, you will need to consult the included instructions. Use the quick-splice connectors to attach the input wires of the tail light converter to the corresponding wires from your vehicle. To get the power necessary to operate, the harness must be connected to a 12V power source. This kit contains the power wire that connects the module to your battery, as well as the necessary ring terminals and butt connectors.

Once the harness is connected, locate a flat surface inside your vehicle near the tail lights and adhere the black converter box using the provided double-sided tape. Find a raw metal surface to use as a ground point and secure the white ground wire using the provided ring terminal and screw. Finally, secure the converter wires to your vehicle using the included cable ties.

It is recommended that you use a small amount of dielectric grease on the 4-pole connector to help prevent corrosion.

Powered Tail Light Converter with Surface-Mount Technology

Because most trailers run on a 2-wire system - wherein the brake and turn signals are carried on 1 wire - the signals from your vehicle may have to be converted to be compatible with your trailer's wiring. If your vehicle operates on a 3-wire system, which means that it has separate brake and turn signals, then those signals will need to be combined so that they run on 1 wire to properly activate your trailer's tail lights. Note: This will not affect how the tail lights on your vehicle operate.

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.

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.

56190 Curt Powered Tail Light Converter for 2-Wire, 3-Wire or PWM Systems - 4-Way Flat Harness

55151 Powered Converter Wiring Kit

C56190KIT Installation InstructionsInstallation Details C56190KIT Installation instructionsC56190KIT Installation InstructionsAlternate Instructions C56190KIT Installation instructions

This Product Fits The Following Vehicles

2006 - 2008 BMW 7 Series

2012 - 2019 Audi A5

2018 - 2018 Toyota Avalon

2013 - 2013 Mercedes-Benz GLK-Class

2013 - 2013 Infiniti JX35

2013 - 2013 Infiniti JX35

2014 - 2017 Lexus LS 460

2014 - 2017 Lexus LS 460

2011 - 2013 Infiniti M37

2011 - 2013 Infiniti M56

2018 - 2019 Audi S5

2015 - 2020 BMW X5

2018 - 2019 Audi A5 Coupe

2018 - 2019 Audi S5 Coupe

2018 - 2018 Toyota Avalon excluding Hybrid

2015 - 2018 BMW X5 excluding M performance models

2013 - 2013 Mercedes-Benz GLK-Class GLK250 models

2015 - 2018 BMW X5 M performance models

2011 - 2011 Infiniti M37 M37x AWD models

2011 - 2013 Infiniti M56 M56x AWD models

2006 - 2008 BMW 7 Series Sedan

2014 - 2014 Mercedes-Benz SLK-Class SLK250

2014 - 2014 Mercedes-Benz SLK-Class SLK250

2018 - 2019 Audi A5 Sportback

2018 - 2019 Audi S5 Sportback

2006 - 2010 Volvo C70 T5 Convertible

2012 - 2014 Audi A5 with Dual Muffler

2011 - 2011 Dodge Journey with Incandescent Bulb taillights

2012 - 2014 Audi A5 with Single Muffler

2013 - 2013 Dodge Durango without factory tow package

See All Vehicle Fits

Video of Curt Powered Tail Light Converter Kit 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 Curt Powered Tail Light Converter Kit Installation - 2013 Infiniti JX35

Today on our 2013 Infinity JX35, we're going to be installing Curt's powered taillight converter kit with 4-Pole flat trailer connector. This is going to allow you to have a 4-Pole trailer connection here on your Infinity. It will provide you with all the necessary lighting, so you'll be DOT compliant in all states. That includes your left turn signal, right turn signal, tail lamps and brake lamps. It features a dust cap here on the end, which can help keep out dirt and debris, ensuring a long lasting connection, as well as secure your wiring up on your hitch when not in use. The powered module will help protect your vehicle's circuits, because if there's any faults on your trailer, the fuse protection that's on your module will open, ensuring that no damage occurs on your vehicle side.We'll begin our installation at the back of the vehicle, with our lift gate open, by removing both the passenger and driver side taillights.

You'll want to use a trim panel tool to help pop this panel up. It releases by going upward. We'll now remove both the bolts located behind it with a 10-mm socket. Then we can pull our taillight assembly off. You want to kind of pull rearward and outward at the same time.

You may need to use a trim panel tool to assist in popping it loose.Here we'll have both of our electrical connectors. We're going to go ahead and disconnect both of those, by pressing in on the release tab. We can set our taillight assembly aside. We'll use the exact same procedures on the opposite side to remove its taillight assembly. We'll now trim back some of the sheathing here so we can access the wiring more easily.

This is our small connector here on our passenger side. On our driver side, we're going to strip back both connectors.We'll now feed a fish wire down through the opening here in the top. We're going to use a piece of air line tube for this. You can use anything that's fairly solid but still flexible. It will make it easier to route your wiring.

Once you feed it down, you want to pull it from underneath until you've got it straight down.Next we're going to hook up our power wire. Pull the precut end off of the module side of the black wire. Take the black out of your kit that comes in a large coiled bundle. We're going to take one end of that wire. We're going to strip it back, and we're going to connect these two together. Now you can use the yellow butt connectors that come in the kit. However, we're going to be upgrading ours to a heat shrink butt connector, since it's going to be outside the vehicle. This will ensure a long lasting connection. I'm going to go ahead and crimp those on. Then we can take our heat gun and shrink it down.Now we're going to take the red, yellow, brown and white wires coming out of our control box. We're going to tape those to the fish wire that we had run down. We're just going to use some electrical tape there. We can use this to pull it back up into our driver side tail lamp housing area. Then I'll pull our fish wire up. You may have to help guide it down below as you're pulling until we get our wiring pulled up.Now the wiring that we pulled up here, our red is our stop signal, yellow is turn signal, brown is tail lamp, and the white one is going to be ground. So we're going to go ahead and use the quick splices that come with the kit to make those connections. We're going to start with our yellow, which is our turn signal. So we got our green wire separated out here. This is the connector that only has two terminals on it. We're going to use our quick splice to crimp those together. So to do so, you slide the wire that you're going to add into one end. The other end we'll slide down the groove that's slit and open. Then you just crimp them down using a pair of pliers. So we're got it all in there, got our pliers here, and we just give it a little squeeze. Make sure that it's all the way seated. You can flip over the top and lock it in place.Our red wire will go to the green wire here on our larger connector. Snap that shut. Lastly, our brown wire is going to go to the white wire, which is the middle here. Our ground wire can attach using the self tapping screw that comes provided in the kit. We're just going to run it right here in our back wall into place. We used a 1/4" socket to do that.Now we went ahead and prepared our pull wire on our passenger side, as we're going to need that. We'll now take our connector and our green wire. We're going to route those over to our passenger side. This connector we can stop when we get about the center, wherever we want it to be. Now in order to get our wire up into our passenger side tail light housing area, we did have to extend it. It's not quite long enough. You can pick up some addition wire here at that we've got it extended, we've taped it to our fish wire, we can pull our fish wire to feed that up. You want to make sure that you avoid your exhaust when pulling that wire up. We'll then make our connection here. We've got our green wire fed over. We're going to connect that to the white wire here on our small connector. Go ahead and feed that in. Slide our green wire in and then crimp it down.We can now take some zip ties included in the kit, and we're going to use that to clean up our wiring here, just to make sure it's all held in place. Zip tie it to the factory wiring. This will just ensure a longer lasting connection, and cleaner re-installation of your components. Now we'll go ahead and clean up our 4-Pole connector wiring. We're just going to bundle that up, zip tie the excess here. We can then use the dust cap to hold it up out of the way. We're also going to secure the green wire up and out of the way.Next, we routed our power wire up to the front of the vehicle into our engine compartment. When we run this wire, you want to make sure you avoid any moving objects such as your steering and suspension, and intensely hot objects such as your exhaust. I like to follow the factory wiring whenever possible. We took our wiring forward here, next to our charcoal canister. We went up over our rear suspension. We zip tied it to the factory wiring along the way. Stayed above that rear suspension until we got to our fuel tank. We ran down the driver side of the fuel tank, zip ting it to the bar that's located next to it. Followed that all the way forward until we got to the front here, where we shot it over to our fuel and brake line connecting point here. Zip tied it to that bracket, and now we're going to make our connection to our pull wire.We went ahead and ran a pull wire down from our engine compartment, so we can get our wire up front. So we're going to connect it just like we did with the ones in the back. I'm going to tape it onto here. Then we'll pull it up into our compartment. Pull our wire up. Once you've got it all the way pulled up, it's a good idea to just double check back down below, to make sure a loose wire didn't get caught on anything, and that you do actually have it all the way pulled up.Next we'll prepare our fuse harness here. We're going to take the yellow ring terminal that comes in the kit, crimp it onto one side of the harness. The other end we're going to connect a yellow butt connector. Once again, we upgraded to that heat shrink butt connector. The other end is going to connect to our black wire, so we want to get about the right length. It's going to go to the battery positive post here, so we're going to leave ourself a little excess, and trim off the rest.We'll now strip back our black wire, and crimp our fuse harness onto it with the yellow butt connector. Gone ahead and shrunk down the butt connector. Now we'll connect our fuse harness to our battery positive post. We're going to go ahead and remove the nut here with a 12-mm socket. Slide our fuse harness ring terminal onto that stud, and then reinstall our nut. We can reinstall the covers, and then insert the fuse into our fuse harness. You should receive a 10 amp fuse in your kit. That will simply slide in, and now you're ready to hook it up to your trailer and test everything out.We've got our tester plugged in here. You can plug it into your trailer. You want to make sure you have your left turn signal, right turn signal, tail lamps and brake lamps. With everything working properly, we're ready to button up our taillights at the back, clean up any of our wiring, and hit the road. That completes our installation of Curt's powered taillight converter kit with 4-Pole flat trailer connector on our 2013 Infinity JX35.

Customer Reviews

Curt Powered Tail Light Converter Kit with 4-Pole Flat Trailer Connector - C56190KIT

Average Customer Rating:  4.5 out of 5 stars   (6 Customer Reviews)

Install a 4-way flat on your vehicle with this splice-in harness. Kit includes the necessary wiring to connect the module to your car battery for power. SMT construction ensures superior performance. Works with 2-wire and 3-wire systems.

- C56190KIT

I installed on my motorcycle trailer. Worked fine. 602340

- C56190KIT
2016 Honda Fit

Everything I received was GREAT! 317023

- C56190KIT

Shipped quickly, good service. Thank yo u! 391389

- C56190KIT
2008 BMW 7 Series

I have not had any problems with this product. It has been great! 489242


They have been great, no issues at all.

Jeffrey - 03/26/2019


- C56190KIT
2015 BMW X5

Installed on a 2015 BMW X5. Super easy to hook up and lights all work great. Installed when I put on the hitch so we had lights hookup. Would highly recommend and super handy. 728239

- C56190KIT
2015 Honda Fit

I bought this kit for my 2015 Honda Fit. All is fine with three exceptions: 1. The green wire that runs over to the right side turn signal was not long enough to reach the right side turn signal wiring!!!! CRAZY, no excuse for that. 2. The blue connectors included do not work. When you clamp them down they do not make contact with the Honda Fit wires. Apparently the Honda wires are too small. Curt should know this. I had to remove all blue connectors and carefully squeeze the little metal plates inside the connectors so that they make contact with the tiny Honda wires. It was a frustrating pain in the rear to diagnose the problem and fix it. Come on Curt, FIX this issue. 3. Lastly, some of the Honda Fit wires were not the colors that Curt said they were. You must test all Honda wires, regardless of colors before making connections, not the end of the world, but confusing none the less . 316447


Product has performed flawlessly.

Crawford - 11/14/2017


Ask the Experts about this Curt Wiring

Do you have a question about this Wiring?

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  • Class III Trailer Hitch & Trailer Wiring Harness for 2013 Audi Q5
  • The Curt # C13136 and the Draw-Tite # 75940 2-inch Class III hitches share identical weight capacities but their designs differ and this will affect the complexity of the installation process. The Draw-Tite hitch installs in place of the aluminum bumper and this hitch requires a more involved installation than the Curt. I linked the instructions and an install video for both hitches to help you decide with which one you feel more comfortable. If it were me, I would go with the Curt in this...
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  • Troubleshooting Wiring Harness Installation for 2013 Infiniti JX35
  • We are happy to help with getting you the correct parts for your vehicle. For your 2013 Infinity JX35, the Curt wiring harness # C56281 you referenced is the correct fit for a factory replacement. The relays you need to install are not in the 6x6 fuse box according to my tech contact but rather in the small box by the firewall that is about 1-1/2 by 6 inches and has a black cover you will remove. It unfortunately is not quite as easy to get to and you may want to test the harness to...
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  • Curt Trailer Wiring Comparison for 2015 Honda Fit
  • The difference between the two Curt harnesses you mentioned is that the part # C59236 has a newer converter box which has a higher amperage rating than the older kit part # C56190KIT. For that reason the part # C59236 would be the better option.
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  • Left Turn Signal on 2012 Dodge Journey Stays On All the Time After Installing Curt Wiring Harness
  • First, let's make sure your are using the right wiring harness for your 2012 Dodge Journey. Wiring harness # C56330 is designed for models that have LED tail lights. If your Journey has regular incandescent bulbs then you would need a different harness # C56190KIT. It is important that the white ground wire be attached to a clean bare metal surface. There can't be any paint or coating of any kind. To test to see if the converter is the problem you can test it using a circuit tester...
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  • Installing Curt Powered Light Converter Kit C56190KIT on 2013 Audi A5
  • When installing a universal trailer wiring kit like the Curt Powered Light Converter Kit # C56190KIT the best thing you can do is simply test the wires behind the tail lights to ensure the correct functions when splicing into them with the harness. I wasn't able to track down specific wire colors for your Audi, but even when a diagram is found it's still always best to test them, as vehicle manufacturers tend to switch up wire colors without notice at the factory. You will need to use...
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Info for this part was:

Edited by:
Lindsey S
Installed by:
Jeff D
Video by:
Dustin K
Written by:
Chelsea B
Video Edited:
Chris R
Test Fit:
David F
Updated by:
Isabelle B

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