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

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

Item # C56383
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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. 1-636-306-4830 to order CURT custom fit vehicle wiring part number C56383 or order online at 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.
  • All Info
  • Reviews (9)
  • Q & A (0)
  • Photos
  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C56383

  • Trailer Hitch Wiring
  • 4 Flat
  • Powered Converter
  • CURT

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


  • Maximum amperage:
    • Stop/turn lights: 5 amps per circuit
    • Tail lights: 7.5 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 scuff panel, interior side panel, and 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 in an out-of-the-way location within your trunk.

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.

56383 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Installation Details C56383 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56383

Average Customer Rating:  4.2 out of 5 stars   (9 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.

2021 Volkswagen Atlas

Everything is good quality hitch went in like should. However on the wiring harness I had to shave the outer tab on all male ends to be able to plug in to female plugs. Also don’t like having the plug inside trunk, then pull it out when needed. Need somewhere to run it out of car and attach permanently near hitch.

If you check in the trunk of your vehicle you may be able to find a grommet that you can cut or pop out to feed the 4-Way through. Then you would be able to secure the 4-Way connector near your hitch receiver using a mounting bracket like part # 18144
Mounting Bracket 4-Pole Flat
and No-Drill Bracket # 18140
No-Drill Mount for Electrical Mounting Bracket - Short
-- Etrailer Expert Jon G - 07/13/2021


Packaged with my new hitch, safe and so und.


Go with Tekonsha

2021 Volkswagen Atlas

Great, easy to fit kit. Running a wire to the engine is a bit of a pain but it makes the wiring safer.


Still working as to be expected. I chose to punch a line and run the electrical line through the spare tire area and down to the receiver. I also purchased an adapter to convert to a round so that I could secure it to keep from loosely hanging. Would purchase again if needed.
Garrett - 06/14/2022






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

  • How To Run Power Wire for Curt Harness on 2016 Honda Fit
    The correct Curt T-Connector Vehicle Wiring Harness for a 2016 Honda Fit is part # C56383. There are three separate connectors, all of which must be used. In regards to the power wire, this will need to be run to the vehicle battery. The easiest way is to find a grommet to route the wire outside and then up to the battery.
    view full answer...
  • Does the Curt T-Connector Wiring Harness Require Reprogramming on a 2018 Volkswagen Atlas
    I cannot speak for the VW Trailer Wiring Harness 3CN055203A but the Curt T-Connector Vehicle Wiring Harness part # C56383 that we offer plugs in behind the tail lights so it will not require any reprogramming/coding. The VW Trailer Wiring Harness you are referring to most likely plugs into a tow port on your 2018 Volkswagen Atlas which is why reprogramming is required to activate the circuits. The Curt option like the factory option offers plug and play install but without the added cost...
    view full answer...
  • Trailer Wiring that Fits 2020 Volkswagen Atlas Trailer Wiring Connectors
    Are you looking for trailer wiring for your 2020 Volkswagen Atlas? The connector in your picture matches what the Curt trailer wiring harness part # C56383 fits to so I believe this is what you are needing.
    view full answer...
    Image 1 for
  • Curt Powered Converter Lead Instruction Sheet CME-PCL-INS
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56383 does refer to that sheet. I've attached the link but also a photo of the sheet to ensure you get what you need in a format that works for you.
    view full answer...
    Image 1 for
  • 2019 VW Volkswagen Atlas Trailer Hitch And 4-Way Wiring Harness
    The Curt Trailer Hitch Receiver # C13366 is a great option for adding a hitch to your 2019 Volkswagen Atlas although we don't have an etrailer branded hitch currently that is a confirmed fit for this vehicle. This hitch will do the job for you whether you're looking to carry bikes, additional cargo, or towing. The black gloss finish looks great and will help resist corrosion for a long life of use on your Atlas. Installing the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat...
    view full answer...
  • Trim Panel Removal for Installing Curt 4-Pole Wiring Harness C56383 on 2018 VW Atlas
    Since we have not yet had a chance to install Curt 4-Pole wiring harness # C56383 on a 2018 VW Atlas we do not yet have a video to share with you to show the scuff panel removal. I was not able to access an online owner's manual for the 2018 Atlas but it is possible that the printed manual that came with your car may have details about trim panel removal. As you noted, Curt's written instructions (Step 3) are not very detailed about the removal of this plastic trim piece so I contacted...
    view full answer...
  • Fit of Draw-Tite 36635 Class II Trailer Hitch on 2021 Volkswagen Atlas SE
    According to the fine folks at Draw-Tite, their # 36635 Class II hitch fits all models of the 2021 VW Atlas except the Cross Sport model. If you'll be using the hitch for light duty towing, you'll need a few additional items to complete your towing system. For a trailer wiring harness, use # C56383. For a ball mount, use # 36061 along with # 19256 for a 1-7/8 inch trailer ball or # 19258 for a 2 inch ball. I've linked to install details for the hitch and the wiring harness as well as...
    view full answer...
  • Recommended Trailer Hitch and Towing Equipment for 2019 Volkswagen Atlas
    The Draw-Tite Class III reciever hitch you'd looked at # 76176 and the Curt Class III, part # C13366 are pretty much identical. The design is very similar, they have the same capacity, they install in the same manner and are similarly priced. The Curt hitch is assembled in the USA, while the Draw-Tite is manufactured in Mexico, which is the only reason I might choose the one over the other. If you'll be using the hitch for towing, you'll need a trailer wiring harness like # C56383 and...
    view full answer...
  • Comparing Curt 2 Inch and Draw-Tite 2 Inch Trailer Hitches for a 2019 Volkswagen Atlas
    The Curt Class III Receiver Hitch part # C13366 and Draw-Tite Class III Max Frame Receiver Hitch part # 76176 are both excellent options for a 2019 Volkswagen Atlas. I recommend the Curt option because the bracing for the receiver tube is a bit less bulky which essentially just translates to a sleeker overall look once installed. Furthermore, the Curt option has a much more durable powder coated finish when compared to the Draw-Tite option. In regards to installation, this is pretty simple....
    view full answer...
    Image 1 for
  • Trailer Hitch and Towing Equipment Recommended for 2020 Volkswagen Atlas Cross Sport
    We do indeed offer a hitch for the 2020 VW Atlas Cross Sport. I'd recommend the Curt Class III hitch, part # C93CR. For a trailer wiring harness, use the # C56383. For a ball mount, I'd recommend the # C45030 and the # PC3 hitch pin. For a hitch ball, use # 19260 for a 1-7/8 or # 63845 for a 2 inch ball.
    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 Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jacob T
Video Edited:
Jacob T
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Ronnie R
Written by:
Ronnie R
Employee Jonathan Y
Video by:
Jonathan Y
Employee David F
Test Fit:
David F

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