1. Trailer Wiring
  2. CURT
  3. Trailer Connectors
  4. Vehicle End Connector
  5. 4 Flat
  6. Plug and Lead
Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit and Tester - 4-Pole Flat

Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit and Tester - 4-Pole Flat

Item # C59496
lowest price pledge
Our Price: $143.00
Trailer Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

This item qualifies for Free Shipping
Shipping Weight: 1.71 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Lowest Prices for the best trailer wiring from CURT. Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit and Tester - 4-Pole Flat part number C59496 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (35)
  • Q & A (0)
  • Photos
  • Why etrailer?

CURT Trailer Wiring - C59496

  • Trailer Connectors
  • Vehicle End Connector
  • 4 Flat
  • Plug and Lead
  • 0 - 5 Feet Long
  • CURT


  • Adapts separate turn and stop lights (3-wire system) to a (2-wire system) on trailer
  • Works with domestic and import vehicles
  • Virtually eliminates draw on vehicle tail light circuit
  • Potted enclosure resists water and vibration
  • Protects against overvolt, ESD, and short-circuits
  • No HD flasher required
  • Battery powered and circuit protected
  • Surface Mount Technology (SMT)
  • Does work with vehicles that have LED tail lights
    • Will work with trailers that have LED tail lights
  • Includes a powered converter wiring kit, a circuit tester, and (4) Quick splices to aid in installation
    • Also includes 4-pole trailer connector cover
  • One-Year Limited Warranty


  • Pigtail length: 17" long
  • 4-Pole trailer connector length: 58" long from converter box
  • Amperage allowance:
    • 3.0 amps per turn/brake
    • 6.0 amps for taillight function

Warning: Overloading circuit can cause fires. Do not exceed product rating or tow vehicle's lamp load rating, whichever is lower. Read vehicle owner's manual and instruction sheet for additional information.

Surface Mount Technology (SMT) is a method for constructing electrical circuits where components are mounted onto the surface of printed circuit boards.

56496 Curt Circuit Protected Powered Converter w/ SMT

55151 Powered Converter Wiring Kit

48705 Circuit Tester

Replaces 56146KIT

Installation Details C59496 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit and Tester - 4-Pole Flat - C59496

Average Customer Rating:  4.9 out of 5 stars   (35 Customer Reviews)

- C59496
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.

- C59496

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-

- C59496

Used this to remedy a bad Dodge ECM module that quit sending brake light signals thru the 7-way plug. Did some cutting and splicing of wires and went "old school" by connecting directly to tail-lights, then back through 7-way. Has worked flawlessly for over 2 seasons now!

- C59496
2007 Volvo XC70

the kit of parts was complete, nothing missing or misfit. Instructions were great up to the end, took a little intuition for the final fuse hookup but overall a great product!

- C59496

Awesome kit. Great videos showing installation. I’ll do it myself.

- C59496
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.

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
14 Gauge Primary Wire - Yellow - per Foot
for extra 14 gauge wire.
-- Etrailer Expert Heather A - 10/27/2018

- C59496
2017 Mercury Tracer

Contains all you need to make this work. Used it on my 2017 GLE350 that has LED tail lights using combined brake and signal lights. Figuring out the correct wires to connect to was a bit trial and error. Running the wire from the module to the fuse box below the rear passenger seat took some time as well. But the setup works without a problem. Wires: Brake (red): connect to ground. Lights (brown): right tail light, white with blue tracer. Right turn: right tail light, gray/black wire Left turn: left tail light, gray/black wire. Ground: at rear of the car, between tail light and spare wheel well. 12V power: below rear passenger seat, using the big screw connector/cable visible there. Good luck!

- C59496

Good value, fast service, met my needs perfectly

- C59496

works perfectly easy to install

- C59496

No problems with one year of use. Lights still working on trailer perfectly.

- C59496
2017 BMW X5

Easy to install. I routed the plug out through the taillight opening. I wrapped electrical tape around the wire where it would be touching the body when it came through the opening just to add a layer of protection against chafing. The test light supplied with the kit did not work. Luckily I had my own.

- C59496
2007 Volvo S60

This was the right wire harness for my 2007 Volvo S60 2.5T vehicle. It was simple to put on and works beautifully.

- C59496

It was exactly what I needed very good quality very easy to install contained everything I needed came promptly at a fair price for what I got....most important ....IT Worked ...etrailer gets high Mark's in ky book would definitely recomend ..

- C59496
2006 Mercedes-Benz M-Class

Very good service and very fast shipping

- C59496

Great customer service.

- C59496

It worked great after I got it installed but it is not easy to install in a Lexus SUV

- C59496
2013 BMW X1

The best thing about etrailer is the support videos. The products are good but without the support.....

- C59496

the receiver has worked well with no problems. I have not installed the air helpers because it would invalidate my warranty.

- C59496
1998 Chevrolet Corvette

Works as advertised, installed on my 1998 Corvette. Don't rely on double faced tape to secure the control module (don't ask me how I know....lol).

- C59496
2018 Honda Civic

Wonderful directions, and easy install. I have done this a few times many years ago, but I am not a electrician!!

- C59496

Super easy to install and works great!

- C59496

Simple enough to install. Works as expe cted.

- C59496

Works great.......

- C59496
2003 Volvo XC70

Product is very well built it fit perfe ctly.

- C59496

Show More Reviews

Ask the Experts about this CURT Trailer Wiring

  • Recommended Trailer Wiring Harness for 2013 VW Jetta SportWagen
    The EcoHitch # 306-X7284 is a great choice! In order to add wiring to tow your boat (those are really cool, by the way), you'll want to use the Tekonsha # 119190KIT which comes with a circuit protected Modu-Lite converter to help protect the electrical components on your vehicle. I recommend using the Tekonsha over the Curt # C59496 harnesses because the converter is a little bit more reliable and since you're likely going to have LED lights on your trailer, the slight difference in amp...
    view full answer...
  • Comparing Curt Trailer Wiring Harnesses for 2007 BMW X3
    Both of the Curt wiring kits you referenced are a fit for your 2007 BMW X3 but the part # C59236 is a higher amp rated version. It is rated for 5 amps for the stop/turn circuit and 7.5 for the running lights. Whereas the # C59496 is rated for 3 amps and 6 amps respectively. What this means is that the higher rated version would withstand trailer wiring shorts better before damaging itself.
    view full answer...
  • Trailer Wiring Harness for 2018 Mitsubishi Outlander Sport
    I have a much easier trailer wiring solution for your 2018 Mitsubishi Outlander Sport with the Tekonsha kit part # 118538 which plugs inline with the taillight connectors of the vehicle. I attached a link to the install instructions for this kit that shows exactly how it installs as well.
    view full answer...
  • Correct Wiring Harness For 2020 Mitsubishi Outlander PHEV
    The Curt 56412 is indeed the same as the Curt T-Connector Vehicle Wiring Harness # C77KR, and does fit your 2020 Mitsubishi Outlander PHEV. It is is the correct harness if you have the factory tow package, otherwise you will need a splice-in harness: - Factory Tow Package: Curt T-Connector Vehicle Wiring Harness # C77KR - No Factory Tow Package: Curt Upgraded Circuit Protected Powered Tail Light Converter # C59496 Often, when there is an issue where one light is not functioning,...
    view full answer...
  • 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...
    view full answer...
  • Will Installing Wiring Harness on Mercedes-Benz GL450 Cause a Bulb Out Indicator
    The Curt Upgraded Circuit Protected Tail Light w Converter Hardwire Kit # C59496 referenced in your question is confirmed to work on your 2014 Mercedes-Benz GL450. This is a hardwire kit that you can use to install a 4-Way connector needed to power the signal lights on your trailer. I have included the installation details for you to check out. On certain vehicles, such as your Mercedes, there may be an issue with the bulb out sensor when towing a trailer with LED lights. If your trailer...
    view full answer...
  • Trailer Wiring Harness for a 2019 Hyundai Tucson Ultimate
    The trailer wiring harness I recommend for your 2019 Hyundai Tucson Ultimate is the Curt Upgraded Circuit Protected Powered Tail Light Converter part # C59496. This kit will work with LED tail lights so you should not have any concerns. It will splice into the tail light circuits on your vehicle and provide you with functions for a 4-way trailer connector. It also comes with all of the wiring connectors you will need as well. Unfortunately, there are no custom fit trailer wiring harnesses...
    view full answer...
  • 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....
    view full answer...
  • 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...
    view full answer...
  • Recommended Trailer Brake Controller and Wiring for 2014 Mercedes-Benz GL450
    We have everything you need to install a trailer brake controller on your 2014 Mercedes-Benz GL450, however there is not a plug-in adapter available that will fit this vehicle. The Tekonsha # 3035-P that you referenced is designed for certain model Ford, Lincoln and Mercury vehicles. It is not compatible with your GL450. If your Mercedes GL450 does not have the factory tow package, you will first need to install a 4-Way connector with the Curt Upgraded Circuit Protected Tail Light w...
    view full answer...
  • Running Lights Will Not Work on Trailer Towed with a 2012 Dodge Journey
    Almost all trailers do use 2 wire system. The 2 wire system means there is one wire for the running lights on each side of the trailer and one wire for the turn signal and brake light. It is likely that both of these wires are running to the dual filament bulbs. The brake light and turn signal will use the brighter or higher intensity filament and the running lights will use the dimmer or lower intensity filament. To troubleshoot your issue, I recommend starting at the trailer connectors....
    view full answer...
  • Should Red Wire of Curt Universal Wiring Kit be Grounded for Jeep JL with 3-Wire System
    If your Jeep JL has a 3-wire system then you will actually attach the red wire from the Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit # C59496 to the brake light circuit. The only time you will ground the red wire is if your Jeep JL is a 2-wire system. You can tell the difference by checking to see if the same circuits are used for both your stop and turn functions. If they do then it's a 2-wire system but if they don't it's a 3-wire system. This wiring...
    view full answer...
    Image 1 for Image 2 for
  • Trailer Wiring Harness Recommendation for a 2012 Kia Sorento
    The main difference between the Curt Modulite Wiring Harness, # C59496, and the Curt T-Connector Wiring Harness, # C56328, is that the T-Connector harness, # C56328, simply plugs into the factory tail light connectors at the back of the tail light assemblies. The Modulite Harness, # C59496, needs to be hardwired into your vehicles tail light circuits. I recommend using the T-Connector Harness # C56163 because you will not need to cut or splice into your vehicles tail light wires. Both...
    view full answer...
  • How to Install a Brake Controller on a 2003 Monaco Knight Motorhome
    In order to install a brake controller on your 2003 Monaco Knight motorhome you will need a 4-way trailer connector, 4 to 7-way trailer connector adapter, and a brake controller. There will also be some loose wires and circuit breakers needed but most kits come with this. For a 4-way trailer connector if not already equipped, I recommend the Curt Upgraded Circuit Protected Powered Tail Light Converter part # C59496 which is compatible with two wire, three wire, and systems with LED lights....
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2005 Cadillac SRX V8 Rear Wheel Drive
    We have some trailer wiring harnesses that have been confirmed to work with the 2005 Cadillac SRX, but they are all the universal hardwire kits, not T-connector style harnesses. For your SRX, we recommend installing the Curt Circuit Protected Tail Light Wiring Kit, # C59496. We have installed this harness on a 2004 SRX, so I attached the installation video for you to check out. I have also attached the installation instructions. The installation for the 2004 SRX will be the same for...
    view full answer...
  • 4-Way Harness Recommendation for Converting Separate Trailer Wiring to Combined
    What you have on your RV is very common. There are several vehicles/RVs that have separate turn signals from brake lights so they require a converter like the part # C59496. This kit will give you a combined circuit 4-way once installed on your RV.
    view full answer...
  • Will the Curt Powered Wiring Harness # C59496 Support LED Trailer Lights
    You can certainly upgrade the tail lights on your trailer to LED tail lights. LED tail lights will draw a fraction of the power that incandescent bulbs require which results in less work for the converter of your Curt Powered Wiring Harness, # C59496. There will not be any compatibility issue between the LED trailer lights and the powered wiring harness on your 2011 Volkswagen TDI. I have attached a link to all of our LED tail lights for you to check out. If you would like to send...
    view full answer...
  • Is Curt Powered Tail Light Converter Kit Compatible with a 2014 BMW X1
    The Curt Upgraded Circuit Protected Powered Tail Light Converter w Hardwire Kit # C59496 actually replaced the discontinued part 56146 and the Powered Converter Wiring Kit # 55151 that you have. Both of these are compatible with your 2014 BMW X1 which you can see from the attached installation video of the older kit you have on a 2014 BMW X1. The thing about this kit is that its a universal fit since you splice the wiring in so it is compatible with just about any vehicle out there.
    view full answer...
  • Tow Bar and Wiring Harness Recommendation for a 2003 Land Rover Discovery
    I did some research on your 2003 Land Rover Discovery and I could not find any information regarding the ability to flat tow your vehicle. I recommend checking your owners manual to make sure it is safe to flat tow your vehicle behind your motor home. Vehicle manufacturers will often place restrictions on vehicles when towing them behind another vehicle or motor home. If you find that it is okay to tow your Discovery, then you will need tow bar wiring like the Roadmaster Universal Wiring...
    view full answer...
  • Can you Route a 4-Way Trailer Connector Under the Vehicle on a 2009 Volvo XC70
    Many vehicles will have grommets somewhere in the rear cargo area that will allow you to route wires to the underside of the vehicle. The grommets are typically found behind the rear trim panels, in the spare tire well, or under the threshold. When we installed the Curt Wiring Harness Kit, # C59496, on a 2011 Volvo XC70, we found a grommet just under the spare tire (see photo). The 2011 XC70 is the same generation as your 2009 XC70, so you should have this grommet as well. Sometimes...
    view full answer...
  • Does 2006 Lincoln Town Car Need Trailer Wiring Harness with Power Ran From Battery
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. For your 2006 Lincoln Town Car you need to install a harness that draws power from the battery to protect the taillight circuits. For that you would...
    view full answer...
  • Installation of Wiring for Trailer Brakes on the 2010 Volvo XC 60
    If you have the factory 4-way installed on your XC60 then you can use a Brake Controller 7 & 4 Way Installation Kit - 10 Gauge, item # ETBC7, to complete the wiring for a 7-way connector and a brake controller. This kit includes all of the wiring, connectors, circuit breakers, and trailer connector needed for installation. I have posted instructions for installing the ETBC7 kit below. If you do not have the OEM 4-Way wiring installed on your vehicle yet you can use the Curt Circuit Protected...
    view full answer...
  • Installation of Curt #C59496 Trailer Wiirng Harness on 2021 Genesis GV80
    You did indeed receive the correct parts. When we sell the Curt # C59496 powered taillight wiring converter we kit it together with the # 55151 power converter wiring kit. The wiring kit is used to run from the taillight converter box up to the positive battery terminal which provides power for the trailer taillights. The # C59496 wouldn't work without the wiring kit. I don't have a specific wiring diagram because the # C59496 is a universal fit product that fits hundreds of vehicles,...
    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.
    view full answer...
  • Is There A T-Connector Harness For A 2020 Mitsubishi RVR
    As of right now, there isn't a t connector harness available for your 2020 Mitsubishi RVR. your only option is to use a universal harness like # C59496, which will unfortunately, result in you having to splice some wires. To install this kit, all you need to do is: 1. Locate your taillight wiring. 2. Identify the type of wiring you have. 3. Disconnect the negative battery terminal on your battery. 4. Using the snap locks, attach the input wires of he taillight converter to the...
    view full answer...
  • Vehicle Wiring Harness For a 2013 Audi A6 Quatro
    The Curt Upgraded Circuit Protected Powered Tail Light Converter # C59496 is a universal type wiring harness and will fit most all vehicles including your Audi A6 Quatro. The kit uses a powered converter that protects your vehicle wiring by sending power to the trailer or auxiliary lights directly from the vehicle battery. Currently we do not have a video of the installation process on your A6. The instructions which I have linked below will give you a better understanding of the installation...
    view full answer...
  • What Color Wires Are Used for Trailer Wiring Harness On 2016 Mercedes Benz GLA
    In regards to installing a trailer wiring harness on a 2016 Mercedes Benz GLA such as the Curt Upgraded Circuit Protected Powered Tail Light Converter Kit part # C59496 which is what I recommend, you must test the wires to determine function. We are not able to provide wire color information. That said, each kit will come with a tester to allow for easy identification.
    view full answer...
  • Parts Needed to Install 7-Way and Brake Controller on 2019 Mitsubishi Outlander PHEV
    To install 7-way trailer wiring on your 2019 Mitsubishi Outlander you'd need the part # C59496 that you referenced as well the part # ETBC7 which comes everything needed to convert it to a 7-way plus everything needed to install a brake controller and have the 12 volt accessory circuit active as well. This also gives a 4-way you can use as well. It gives option to have reverse light circuit wired in too in the future if you'd like also. Then for a brake controller the Draw Tite I-Command...
    view full answer...
  • 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.
    view full answer...

Do you have a question about this Trailer Wiring?

  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality trailer wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

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 Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L
Employee Isabelle B
Updated by:
Isabelle B
Employee Noah M
Updated by:
Noah M
Employee Amanda M
Written by:
Amanda M
Employee David F
Test Fit:
David F
Employee Bradley B
Test Fit:
Bradley B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.