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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 Wiring - C56190KIT
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Curt wiring for your 2016 Ram are available from etrailer.com. Installation instructions and reviews for your Ram wiring. Expert service, and cheapest wiring price guarantee. etrailer.com carries a complete line of Curt products. Order your Curt Powered Tail Light Converter Kit with 4-Pole Flat Trailer Connector part number C56190KIT online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (15)
  • Q & A (9)
  • Photos
  • Why etrailer?

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

Installation Details C56190KIT Installation instructionsAlternate Instructions C56190KIT Installation instructions

Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (15 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
2015 BMW X5

Love this system! Installation on my 2015 X5 was very simple, straightforward. I did have issues for a period where I kept blowing the 10 amp power line fuse. Customer support was good, and I eventually found that mice had chewed into my trailer wiring causing intermittent shorts. After fixing the wiring on my trailer, the Curt system has performed flawlessly!

- C56190KIT

Easy installation and the best value. The extra money for the "kit" is only needed for the butt connectors and the in-line fuse, but having it all together in a package was certainly convenient. If you already have butt connectors (16-18 gauge?) and you can source an in-line fuse line cheaply, you can save some money. The extra lead for the positive power line in the kit is unnecessary on the BMW X5 F15 depending on where you're locating the box. If I had needed it, my package was short one butt connector to have used it (the image of the converter box shows a pre-attached butt connector to a black lead...that wasn't there on mine and I used one from the separate packaged installation "kit"). The installation video for the BMW X5 F15 (2014-2018) was perfect. Only a 3-star rating because of short leads on the product. If the power wire were just 6-12" longer it would be perfect (I still didn't need any extension), and the green lead for the right tail-light is too short. I was able to get it there...barely...and I'll need to come back and splice in an extra 12-18" of wire so there is no risk of it being pulled when servicing the batteries or compartments. The product only includes the bare minimum lengths, and even then it only worked because I was able to tap it into the larger wire bundle closer to the bottom of the compartment rather than at just few wires separately leading to the tail light.

- C56190KIT

Works as expected. I cut the trailer connector off and spliced in additional wire so the I could route it through a grommet and do a permanent installation at the hitch receiver.

- 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 .

Product has performed flawlessly.
Crawford - 11/14/2017

- 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.

- C56190KIT

- C56190KIT

- C56190KIT

- C56190KIT

Easy website to use, prompt shipping and a quality product!!!

- C56190KIT

I installed on my motorcycle trailer. Worked fine.

- C56190KIT
2008 BMW 7 Series

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

They have been great, no issues at all.
Jeffrey - 03/26/2019

- C56190KIT

excellent on line guidance on best options, fast shipping, great customer service

- C56190KIT

Works as expected

- C56190KIT
2016 Honda Fit

Everything I received was GREAT!

- C56190KIT

Shipped quickly, good service. Thank yo u!


Ask the Experts about this Curt Wiring

  • 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...
    view full answer...
  • 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...
    view full answer...
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  • Recommended Trailer Wiring for 2015 BMW X5
    For your 2015 BMW X5, I recommend the Curt Powered Tail Light Converter Kit with 4-Pole Flat Trailer Connector # C56190KIT. You can use the attached video to assist. You can route the connector down through panels or grommets to the hitch location. I recommend using a mounting bracket like # 18144. The s8sla trailer coupling preparation from what I can find means wires may be run but at not completed. I recommend using the above kit to avoid any issues and give you what you need.
    view full answer...
  • Prodigy P3 And 2021 BMW X5 With Towing Package
    We do carry wiring that will allow you to install the Prodigy P3 on your 2021 BMW X5. Unfortunately, Tekonsha does not make a proprietary plug and play harness to go between your vehicle and the brake controller. Therefore, you'll need to use a wiring product like the # ETBC7 to install the Prodigy P3 to your X5. I couldn't find any more information about your vehicle's towing package other than it includes a Class III hitch capable of hauling 7200 lbs. In the event that your vehicle...
    view full answer...
  • 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...
    view full answer...
  • Recommended Trailer Wiring Harness for 2011 Audi S4
    There is not a harness that plugs into your factory wiring without splicing so I recommend the Upgraded Heavy Duty ModuLite Circuit Protected Vehicle Wiring Harness with Installation Kit # 119190KIT. This will have the amperage you need whether you pull a trailer with incandescent or LED lights. I've attached a video of this installation on a Q7 to assist with the installation. I've also attached the installation instructions to help.
    view full answer...
  • 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...
    view full answer...
  • 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.
    view full answer...
  • Can Curt Echo Brake Controller Be Used with Tow Dolly Electric Brakes
    Some car dollies have electric brakes which the Curt Echo Mobile part # C51180 would work great with. Some dollies have surge brakes which don't require a brake controller as their braking system is essentially self contained. If the dolly are considering has electric brakes though this would work great with it. For a tow dolly that has electric brakes we have the part # RM-2050-1.
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video by:
Joshua S
Employee Dustin K
Video by:
Dustin K
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Chelsea B
Written by:
Chelsea B
Employee Sarah W
Updated by:
Sarah W
Employee Isabelle B
Updated by:
Isabelle B
Employee Shane H
Test Fit:
Shane H
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G

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