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Curt Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit

Curt Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit

Item # C59496
Our Price: $174.79
Custom Fit Vehicle Wiring

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Great for cars and trailers with either LED or incandescent bulbs, this kit converts your vehicle's lighting system to match your trailer's. It includes a 4-way flat, wire taps, and a power wire that pulls power directly from your battery. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C59496 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (102)
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CURT Custom Fit Vehicle Wiring - C59496

  • Universal Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • Converter
  • CURT
  • 8 Feet Long

Great for cars and trailers with either LED or incandescent bulbs, this kit converts your vehicle's lighting system to match your trailer's. It includes a 4-way flat, wire taps, and a power wire that pulls power directly from your battery.


  • 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
  • Avoids overloading your vehicle's electrical system by connecting directly to your battery
    • Power wire and fuse kit included
  • Designed with safety in mind
    • Guards against electrical shorts, mis-wire situations, and electrostatic discharge
  • Splices into your vehicle's wiring with the included quick-splice connectors
    • Color-coded wires ease installation
  • Resists damage from shock and vibration for superior operation on rough roads
    • Circuit board is constructed using surface-mount technology (SMT), an improvement over through-hole construction
  • Includes durable, molded-rubber, female output socket with protective dust cover


  • Application:
    • Vehicles with 2-wire or 3-wire electrical systems
    • Trailers and vehicles with LED or incandescent lights
  • 4-Way harness length: 58"
  • Splice-in wire length: 17"
  • Ground wire length: 17"
  • Power wire length: 20'
  • Maximum amperage:
    • Turn lights and brake lights: 3 amps per circuit
    • Tail lights: 3 amps per circuit
  • Wire gauge:
    • Power wire: 12
  • Limited 1-year warranty

Do I Need A Tail Light Converter?

Difference between 2 wire systems and 3 wire systems

Some vehicles operate on a 3-wire system, wherein the brake signal and the turn signals run on separate wires to illuminate different lights. (Typically, these vehicles have amber turn signals.) But most trailers run on a 2-wire system, which means the brake and turn signals travel along a single wire. You'll notice that, on your trailer, the brake light will flash for the turn signals.

If your vehicle operates on a 3-wire system, it will need to be converted so it will be compatible with the wiring system of your trailer. This is where a tail light converter comes into play. This converter lets you combine the brake and turn signal functions of your vehicle so they run on a single wire to properly activate your trailer's tail lights.

Powered by Your Battery

This converter won't overload or cause damage to your system because it pulls power straight from your vehicle's battery. So you can be sure that your trailer lights will activate no matter what type of bulbs your vehicle has - or your trailer, for that matter.

Converter Wiring Configuration

Wire Color Wire Function
Green Right turn
Brown Tail lights
Black Battery power
Red Brake
White Ground
Yellow Left turn

Powered Tail Light Converter Installation

This kit comes with all the wiring you'll need to convert your vehicle's lighting system to match your trailer's. The powered converter box has splice-in wires on one end and a harness with a 4-way flat vehicle-end connector on the other. It also comes with a power wire that will connect to your battery so your electrical system doesn't get overloaded.

To begin the installation, use the included circuit tester to double-check the function of each wire on your vehicle's tail light wiring harness. The color/function of the splice-in wires on this converter may not match the color/function of those on your vehicle, so you'll want to be sure to check all of the wire functions first. Once you've figured out the functions of your vehicle's wiring, use the included quick-splice connectors to connect the corresponding wires on the trailer connector. Quick-splices, or "wire taps," offer a quick way to make connections without you having to strip and twist wires. Just place the wires in one of the taps and snap the cover down.

Using the included double-sided tape, stick the converter box to a flat surface inside your vehicle near the tail lights. It's helpful to clean the surface first so the tape can adhere fully.

Once the converter box is spliced in, you need to run the power wire up to your battery. Be sure to remove the fuse before connecting anything so you don't blow it! You can put it back in once everything has been installed. To hook up to your battery, you'll need to disconnect the negative cable from your battery and attach the power wire to the positive terminal with the included ring terminal.

How to find a grounding point

Find a raw, unpainted metal surface to use as a grounding point and secure the white ground wire using the included self-tapping screw. Cleaning the surface before securing the white wire will ensure the converter is fully grounded. If you have a 2-wire system, the red brake wire will need to be grounded as well. You can do that in the same way, using an extra ring terminal (sold separately). Finally, secure the converter wires to your vehicle using included cable ties.

Quick Tips:

  • Butt connectors - especially heat-shrink ones - provide the most secure, longest-lasting connection, so we'd recommend you grab a few and swap them out for the quick-splices in this kit.
  • Use a circuit tester on the plug terminals once the harness is installed to make sure everything's working. There's nothing worse than figuring out that you have a bad ground or a faulty connection right before you're about to hit the road.
  • Be sure to put a little bit of dielectric grease on the 4-way plug to protect the terminals from dirt, grime, and corrosion.

Built Using Surface-Mount Technology

Curt SMT Circuit Boards

Curt builds each tail light converter using surface-mount technology (SMT). This construction method 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 smaller circuit board that provides more routing area and that offers superior performance, reliability, and durability.

Circuit boards constructed using SMT 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, increasing durability and lifespan. In addition, lower resistance levels ensure better performance, especially for parts that operate at higher frequencies.

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

56496 Curt Vehicle Wiring Harness with Vehicle End 4-Pole Connector and Powered Converter Kit - 58" Long

55151 Powered Converter Wiring Kit

48705 Circuit Tester

Replaces 56146KIT

Installation Details C59496 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Curt Powered Tail Light Converter w/ 4-Way Flat Trailer Connector and Install Kit - C59496

Average Customer Rating:  4.7 out of 5 stars   (102 Customer Reviews)

Great for cars and trailers with either LED or incandescent bulbs, this kit converts your vehicle's lighting system to match your trailer's. It includes a 4-way flat, wire taps, and a power wire that pulls power directly from your battery.

2023 Ford Maverick

Also a must for newer vehicles with fine gauge wiring to assure adequate current is sent to the trailer lights. Easy to install and works great!!

2005 Volvo XC70

I installed this in about 1 hour mostly reading and discovering which wires to use. I went and tested on a standard trailer and all the lights work as expected. With the battery in the back of the Volvo xc70 2005 I didn't have to run the wire to the front so it was even easier to install than most vehicles



Its been on a year now and I love the ability to pull a 4x8 trailer with my xc70.


The hitch was easy to install. But the wiring harness I couldn’t install it. I didn’t want to split the wires.


Haven't installed the harness yet


Complete converter. Perfect for my car. Made towing a trailer very safe and easy.


Easy plug and play install. Replaced old version that had a fried converter.

Second time buying from Etrailer, will buy again if necessary. Came in a timely manner.



Still in good shape no issues

2022 Genesis GV80

This harness worked great and very easy install.


I have an older but well maintained Class A RV. I wanted to tow with lights but found out my turn signals were not the same as my brake lights. etrailer had the solution for my problem. Been on 2 cross country trips with the lights module and everything works great !

2004 Mercedes-Benz SLK-Class

Very happy with the trailer hitch and 4-way tail light converter for my 2004 Mercedes SLK 320. I never thought anyone would make one for a sports car, but etrailer does and it works perfectly. I found the etrailer hitch on the "SLK World" website, where other SLK owners have also installed it, and would recommend going there if you have an SLK.


"Plug and play" towed multiple trailers with no lighting issues very happy with the product.


Product was great! Fit perfectly on my 2022 Kia Sorento Hybrid S Model. I worked at a dealership so I got the hook-up for installation but the product and the service are unmatched at etrailer.

2021 Ford Bronco Sport

Mounted the receiver yesterday. Receiver is very well built. Instructions could have been better. Instructions are clear on where to trim the bumper cover but do not mention modifying the heat shield that is behind it.
Overall a good fit and a well made product.


Not looking forward to the wiring installation, but the instructions look very good. Curt makes a really great hitch.


works great!
plug and play!


Looks to be of high quality




2016 Volkswagen Jetta

Got this for a 2016 Jetta. Instructions say to run this outside and under the car, but found it easier to run up the left side in the interior, tucking under the trim pieces and through the steering boot to the fuse box. Works great!


Great customer service


Functional piece of equipment. Was easy to install.


Worked as advertised and easy to install

2004 Dodge Sprinter

converter and flat 4 wiring was fine. for my application, the green RH turn signal wire was over 2 feet too short to cross from one tail light to the other. really, add 3 ft to the wire, much less hassle. the power wire from battery to converter is ALSO TOO SHORT, by more than 5 feet. Since that part of the kit is really only the fuse holder and the wire, this was a waste of money. NOT AT ALL WHAT I WOULD CALL A UNIVERSAL FIT.

Etrailer Expert

Heather A.


This wiring harness part C59496 is considered a universal fit because it is not a plug and play custom fit application. It can be hardwired into many different vehicles. If you needed extra wire for your vehicle, I recommend part # DW02412-1 for extra 14 gauge wire.


Works well - installation isn't hard after you figure out where to mount the unit and identify which wires in the vehicle harness are needed to attach the converter.

The tester probe is pretty much useless as it's hard to see. I ended using my own test tools (multimeter) to confirm its operation.

Rather than drill holes in the vehicle. I keep the harness inside the vehicle and pull it out when needed.

2008 Lincoln Town Car

The trailer lighter converter doesn't seem to work the brake lights after installation. I will be contacting customer service about this issue.

Etrailer Expert

Sierra K.


Before you test the harness with a circuit tester like item # PTW2992 can you please remove the fuse on the power wire for 30 minutes, then reinstall it. This fuse should be located close to the vehicle battery in a fuse box. If the powered converter box has engaged its circuit protection feature, this will reset the box unless it was overloaded and it was damaged.



I wish to apologize thinking there was an issue with the converter when there wasnt, the next day I did a check and because I infact thought I needed to connect the brake red wire directly to the brake switch and not the multi-purpose red and green wire on my 08 Lincoln. It works great when you wire it correctly.


Great looking product can't wait for in stallation


On my cmax it was easy to put to geather. On the cmax the battery is in the back.


The Curt trailer hitch has been perfect- i also purchased the light system to connect to the trailer - it took me a whole day to install and i am thankful for the detailed videos for the hitch and lights. I only got help with the hitch when lifting it into position as i do not have a hitch jack. I think the hitch is top quality and I am confident to pull anything-

Show More Reviews

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

  • Best Trailer Wiring Harness for a 2006 Nissan Altima
    The Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit and Tester - 4-Pole Flat # C59496 is a confirmed fit for your 2006 Nissan Altima. I have attached a sample installation video as well as the installation details for you to check out. The cost is found on the product page.
    view full answer...
  • Will the Curt C59496 Also Work On Trailers with Incandescent Lights
    Yes. The Curt # C59496 will provide enough power for incandescent lights on a trailer without issues and is a confirmed fit on your 2015 Chevy Camaro.
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  • 2023 Chevy Bolt EUV Trailer Wiring Harness Fitment
    The trailer wiring kit we have that you can install on your 2023 Chevy Bolt EUV is the Curt Powered Tail Light Converter w/ 4-Way Flat Trailer Connector # C59496. This is a universal-type kit so you'll have to splice into your vehicle OEM wiring for the installation. If this isn't something you're comfortable with then I recommend having a local trusted shop help you out. At this point in time (December 2023) there unfortunately aren't any custom wiring kits that tee in behind the tail lights.
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  • Trailer Wiring for 2009 Nissan Armada
    To add a 4-way to your 2009 Nissan Armada that does not have trailer towing package you'd want the 4-way kit part # C59496.
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  • Installation of Wiring Harness on 2019 Hyundai Tucson
    The Curt Upgraded Circuit Protected Powered Tail Light Converter # C59496 will splice into the wiring behind the tail lights on your 2019 Hyundai Tucson. You'll likely need to open the rear hatch of your Tucson to access the area behind the tail lights; there should be some screws that allow you to remove the tail light housing and access the wires you need to splice into. You will also need to run the included heavy gauge wire to the battery and connect via the included ring terminal....
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  • Universal 4-Way Wiring Harness that Can Fit Tiffin Built on Sprinter Chassis
    The Curt trailer wiring harness part # C59496 is a universal style 4-way kit that can be used on vehicles like your 2019 Mercedes Sprinter 3500. Since the Sprinter has standard wiring but the RV has LED lights it could work as long as you connect to wiring that for sure was designed to power incandescent lights.
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  • Ground Wire Gauge of Curt Tail Light Converter
    The ground wire is 12 gauge for the Curt Upgraded Circuit Protected Powered Tail Light Converter with Hardwire Kit and Tester - 4-Pole Flat # C59496.
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  • Wiring Harness on a 1990 Lexus LS400 Gets Hot
    A typical taillight converter can handle between 8 and 9.2 amps. I would recommend the Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, part # C59496. This converter is rated up to 15.9 amps, and is a Modulite system, which draws its power directly from the battery, instead of through the lighting circuits. Using this unit should solve your problem.
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  • Can I Bypass The Converter Wiring And Wire The Trailer Lights Directly To Vehicle Tail Lights?
    With having a Curt Upgraded Circuit Protected Powered Tail Light Converter # C59496 on your vehicle you will not be able to connect your vehicle and trailer wiring directly. The converter reduces draw on the factory wiring and send power to the trailer lights from the vehicle battery. If you were to connect the wiring directly you risk damaging the wiring by putting the additional draw on the thin factory wires.
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  • Wiring a 2007 VW Eos 3.2 with Multiplexed Wiring for Towing a Trailer
    The 2007 Volkswagen Eos has a Multiplexed wiring system that requires wiring the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, item # C59496, for a trailer connector. There are 3 ways of wiring depending on how your vehicle is wired from the factory. In the instructions, at step 9 (see link), it explains that you may have a two wire system that requires the red stop wire to be grounded along with the white wire. If you have the 3 wire system (most likely) with amber...
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  • 4-Way Trailer Wiring Harness for Converting Separate Taillight Turns Signals to Combined
    The most popular trailer wiring kit we offer that is designed to convert a vehicle with separate taillight circuits to combined is the part # C59496. This wires to the vehicle with separate taillights and then provides a 4-way that has combined circuits.
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  • Wiring Harness Not Powerful Enough to be Used with a Trailer that Needs More Amps
    The maximum amp rating for the T-One Wiring Harness are as follows: Maximum stop/turn light: 1 per side (2.1 amps), Max. tail lights: (4.2 amps). This rating is even with the hot lead pulling power directly from the battery. For your application, you will need to use a Heavy Duty Modulite, part # C59496, which is rated for 15.9 amps. This kit does not plug directly into the vehicle, so it must be hardwired. The Kit includes 20 feet of 12 gauge wire for attachment to the battery.
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  • How To Install Trailer Wiring Harness on 2014 BMW X1
    The 2014 BMW X1 uses a multiplexed wiring system which means either the vehicle’s brake and tail functions are combined on one wire and the turn functions are on separate wires or the vehicle’s brake, tail and turn functions are combined on one wire. In order to determine which you have you will need to test for this with a circuit tester. Therefore, when installing a trailer wring harness like the Curt Upgraded Circuit Protected Powered Tail Light Converter part # C59496 you'd not connect...
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  • Can the 12 Volt Power Wire from a Trailer Wiring Harness Tap Into a 12 Volt Accessory Outlet
    I strongly recommend running the 12 volt power wire from the Curt Wiring Harness, # C59496, directly to the vehicle battery. The 12 volt accessory circuit was not designed to support the additional load of a trailer wiring harness. A wiring harness must have its own dedicated circuit directly to the battery. We have seen many instances where customers have tapped into a 12 volt accessory circuit, like a car lighter socket, and the harness failed. We have also seen instances where the accessory...
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  • Recommendation for a Trailer Wiring Harness for a Victory Vision Motorcycle
    I would recommend using the Upgraded Modulite Circuit Protected Vehicle Wiring Harness with 4 Pole Trailer Connector, item # C59496, which includes the all of the wiring needed and a circuit tester to help determine the wires to splice into for the tail light functions. The # C59496 wiring harness is a powered harness that draws only about 5 milliamps from the vehicles tail light circuits and provides power to the towed trailer from the motorcycle battery, protecting the motorcycles sensitive...
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  • 2004 GMC Yukon 4-Way Trailer Wiring Recommendation
    Sounds like you are looking for a 4-way wiring harness for your 2004 GMC Yukon. The part # 41155 that you referenced will fit your truck if it has the round 7-way connector present behind the bumper. If you have no trailer wiring at all you instead would want the part # C59496. This is a hardwire kit that will fit your vehicle regardless of whether or not you have the round connector.
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  • Recommended Trailer Wiring Harness for 2013 Jetta Sedan SE
    The # C59496 would work, however if it were my vehicle, I'd use the Tow Ready # 118572. Granted it's more expensive, but the 118572 uses connectors that plug inline with the junction between the taillight assemblies and the wiring harnesses feeding the taillights. You'd still need to run a power wire to the battery, but you wouldn't need to cut or splice into any of the vehicle wiring. Since the wire used in the taillight circuits of late model vehicles has become progressively smaller...
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  • Recommended Trailer Wiring for 2013 Ford Taurus Police Interceptor
    I recommend the Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C59496 for your 2013 Ford Taurus Police Interceptor trailer wiring. This will give you a 4-way flat connection that will allow you to work with the unique wiring of a police interceptor and draws power directly from the vehicle battery to protect your electronics. There is not a harness that will plug into factory wiring for your vehicle because it isn't a standard model. This kit will allow you to use quick...
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  • Trailer Wiring Harness Recommendation for a 2016 Dodge Journey
    I have a trailer wiring harness I can recommend for your 2016 Dodge Journey, but it is not the part # 118536. Instead you would want the # C59496 as it has been confirmed to fit your vehicle. It is not a plug and play option though and will require some hardwiring.
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  • Curt Trailer Wiring Harness part # 56146KIT Recommendation to Convert Separate Signal to Combined
    Yes there is, you would need to install the Curt Trailer Wiring harness part # C59496 on your ambulance and it will convert the separate trailer wiring to a combined signal that would work well on your trailer. I attached installation instructions and an install video that shows a typical installation to show you how to test the circuits and install this harness.
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  • Trailer Wiring Recommendation for a 2006 Honda Element
    Since you have a 2006 Honda Element the port you are looking for behind the access panel you are trying to remove isn't there so there would be no reason to remove it. The harness # 118465 is not the correct harness for your vehicle as it would only fit the 2007-2011 models. You will need to use a hardwire trailer wiring kit part # C59496 which would not require you to get behind that panel. I attached installation instructions and an install video for you to check out as well.
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  • Can a Modulite Trailer Wiring Harness be Installed Under the Hood of a Vehicle
    Technically, you could install the Heavy Duty Modulite # C59496 anywhere that it will fit, including under the hood. But since it is meant to wire into the vehicle tail light wiring for trailer lights the easiest place to install it would be the rear of the vehicle. Otherwise you are running all of the tail light wires and 4-Way to the back of the vehicle which would require a lot of extra wire.
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  • Powered Converter Recommendation for 1982 Volkswagen Vanagon
    The Hopkins Active Taillight Converter with Install Kit, # 46255, will work on your 1982 Volkswagen Vanagon but I highly recommend going with the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, # C59496. This is the harness that we frequently install on the European vehicles that come into our shop due to the fact that it is a heavy duty wiring harness. The Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, # C59496, with short circuit protection...
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  • Wiring Harness, Sensor, and Electrical Problems After Installing a Spliced Wire Harness on a Toyota
    The item you selected, T-One Vehicle Wiring Harness, part # 118304, will work on your Toyota. There is another harness that will protect the vehicles circuits, the Upgraded Heavy Duty Modulite Circuit Protected Vehicle Wiring Harness, part # C59496. This kit only draws .5 milliamps from the vehicle lighting system and uses a circuit protected modulite that is a safe guard from short circuits or wiring shorts. Part # C59496 draws power directly from the vehicle battery, and only draws...
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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 Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Jonathan Y
Video Edited:
Jonathan Y
Employee Dustin K
Video by:
Dustin K
Employee Chris R
Video by:
Chris R
Employee Thomas T
Video by:
Thomas T
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
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Hannah L
Employee Isabelle B
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Employee Noah M
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Employee Sabrina W
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Employee Amanda M
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Employee David F
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