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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. No Tow Package
  5. Trailer Hitch Wiring
  6. Vehicle End Connector
THIS ITEM IS NOT A FIT FOR
2018 Thor Quantum Sprinter Motorhome
CURT

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

Part Number: C56390
In Stock
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$57.92
Retail:$104.95
You Save: 45%
Custom Fit Vehicle Wiring
Not Confirmed to Fit

2018 Thor Quantum Sprinter Motorhome

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In Use/Installed

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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56390 or order online at etrailer.com. Free expert support on all CURT products. Great prices 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 (13)
  • Q & A (0)
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CURT Custom Fit Vehicle Wiring - C56390

  • 4 Flat
  • No Tow Package
  • Trailer Hitch Wiring
  • Vehicle End Connector
  • Plug-In
  • CURT
  • Plug and Lead
  • Powered Converter
  • Hidden

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.


Features:

  • 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 in rear cargo area
    • 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


Specs:

  • Maximum amperage:
    • Stop/turn lights: 6 amps per circuit
    • Tail lights: 3 amps per circuit
  • Limited 1-year warranty


Installation

This custom-fit T-connector plugs into your vehicle's wiring harness, which is located in the rear cargo area. You will have to remove the trunk floor coverings, storage trays, scuff panel, and interior felt liner 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 cargo area.


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.



56390 CURT T-Connector Vehicle Wiring Harness with 4 Pole Trailer Connector

Replaces Curt C56312

Installation Details C56390 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

5.0

13 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.

by:

Easy time install. Working as advertised. Time will tell on durability. Purchased via phone order. The staff at etrailer were knowledgeable and professional. Thanks!!



by:

I am very satisfied with this item. I had it professionally installed. It's the second wiring harness I've purchased from you; the first was for my other vehicle. I would buy from you again!



by:

Cannot imagine adding trailer wiring to car without this kit. Definitely plug-and-play. The hardest part was running the wire underneath the car, from the trunk to the battery. No doubt much easier if you have a lift, but difficult using jacks or ramps.



by:

This wiring kit ade the install extremely easy and is holding up very well. The trailer sits outside, uncovered year long and the wiring and lights still look almost new.



by:
2018 Hyundai Sonata

Easy to install. Works great!



by:

perfect fit easy installation



by:

Thanks to Bill E who looked into why I received a wrong type of wire harness (Hopkins instead of Curt) two times and corrected it to the right order, I will make it to my home in Florida from Iowa in the nick of time. I received all that I needed, including an adapter converting the wiring to trailer. Went from bad to "All is good"
Mark



by:
2018 Hyundai Sonata

Loved both products I purchased. Light kit and Curt trailer hitch for my 2018 Sonata. Both were extremely easy to install and built with quality materials. I will definitely purchase from etrailer again and I will also recommend to friends. Thank you!



by:

Wire harness is still functional with no issues after a year.



by:

The complete process from ordering to installing was a breeze.



by:



by:
2018 Hyundai Sonata



by:
2019 Hyundai Sonata


13
13

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

  • 2018 Hyundai Sonata Parts Needed to Tow a Trailer
    The ball mount you get to pair with the Curt Trailer Hitch Receiver # C11402 on your 2018 Hyundai Sonata ultimately depends on the height of the trailer coupler that you're towing. A general rule of thumb is that smaller trailers will have a coupler height of about 14" - 16" and when we installed this hitch on a 2018 Sonata (see attached video) we found the hitch height to be 10-1/2" which means we need a minimum rise of 3-1/2" to be in that range. For your application I recommend checking...
    view full answer...
  • Product Availability for Hauling a Honda Ruckus with 2017 Hyundai Sonata
    You have two options of a hitch for your 2017 Hyundai Sonata, the Curt Trailer Hitch Receiver, # C11402 and the Draw-Tite Sportframe, # 24965. I prefer the Curt option that is assembled in the USA and noted for having a superior powder coating. Each of these options have the same specs of being a Class I hitch with a 1-1/4" receiver. They are rated for a maximum gross trailer weight of 2,000 lbs. and a maximum tongue weight of 200 lbs. Meaning that the vertical load on these hitch options...
    view full answer...
  • How To Run Power Wire for Trailer Wiring Harness On a 2019 Hyundai Sonata
    The trailer wiring harness I recommend for a 2019 Hyundai Sonata is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56390 which is almost entirely plug-n-play. In regard to installation, the two pigtails plug in behind the taillights, the white wire needs to be grounded, then the black power wire gets run to the battery. In regard to the exact path to take, neither we nor the manufacturer provide instructions for this because it varies so much from install...
    view full answer...
  • Recommended Class I Bike Carrier For a 2016 Hyundai Sonata Hybrid For E-Mountain Bike
    First you will need a Draw-Tite Sportframe Trailer Hitch Receiver # 24965 to be able to carry a bike rack on your 2016 Hyundai Sonata Hybrid. This is needed as your E-Mountain Bike is going to weigh to much for a trunk mounted rack or roof rack option. I prefer the Draw-Tite over the Curt # C11402 as the crossbar is one solid piece and is not cut in half with the receiver tube welded in. The Kuat Transfer V2 Bike Rack # KU64FR will carry one bike up to up to 60lbs with up to a 3" wide...
    view full answer...
  • What is the Difference Between Class I Hitch C11402 and the C114023 That Curt Sells
    The Curt # C11402 Class I hitch you mentioned is a fit for your 2018 Hyundai Sonata. The # 114023 is the same exact hitch that Curt sells as a kit that includes the # C45521 ball mount. We don't sell the hitch and ball mount together as a kit, we sell the parts individually. If you'll be using the hitch for light duty towing, in addition to the hitch and the ball mount, you'll also need the trailer wiring harness part # C56390 and either a # A-80 1-7/8 inch or a # A-82 2 inch trailer...
    view full answer...
  • Recommended 4-Pole Wiring Harness for 2016 Hyundai Sonata Hybrid
    We do have 4-pole trailer wiring harness kits for the 2016 Hyundai Sonata Hybrid so long as it is NOT the plug-in version. For this vehicle I suggest the Curt harness # C56390 which offers plug-in installation at the rear of the vehicle, at the back of the two tail light assemblies. The rest of the installation consists of securing the ground wire's ring terminal to a nearby clean bare metal surface and running one other supplied wire to the battery where it connects using the included...
    view full answer...
  • Trailer Hitch for 2019 Hyundai Sonata
    The vast majority of the hitches we offer are vehicle-specific. Unfortunately, due to the very different design of both vehicles, there isn't a safe way to make the hitch for your 2015 KIA Soul to fit your 2019 Hyundai Sonata. The good news is that KIA sold a lot of those vehicles, so there's very likely some demand for a used hitch, so you could sell the old one on FB marketplace or Craigslist. You could use the proceeds to offset some of the cost of a new hitch for your 2019 Sonata,...
    view full answer...
  • Does Draw Tite Hitch 24965 Fit 2016 Hyundai Sonata Hybrid
    The Draw Tite hitch part # 24965 that you referenced does fit the hybrid Sonata models in 2016. This changed in years newer than that but for your 2016 Sonata Hybrid this hitch does fit and work well. For trailer wiring then I would recommend the Curt kit part # C56390 because it doesn't require any splicing of vehicle wiring. For a ball mount you'd need the part # 3593 and then for hitch balls part # 19258 for a 2 inch hitch ball or part # 19256 for a 1-7/8 inch ball.
    view full answer...
  • Does Draw Tite Hitch 24965 Fit 2019 Hyundai Sonata Assembled In USA
    Your specific 2019 Hyundai Sonata is compatible with the Draw Tite hitch part # 24965. Yours is not a Korean made vehicle which this hitch is not compatible with. For a wiring harness you will want the Curt T-Connector part # C56390 for your vehicle. The amperage rating for the Curt # C56390harness is: Stop/turn lights: 6 amps per circuit Tail lights: 3 amps per circuit For a ball mount you'd then want the part # 3593 and hitch ball # 19258 for a 2 inch ball or part # 19256 for a 1-7/8...
    view full answer...
  • Trailer Hitch and Wiring for a 2016 Hyundai Sonata
    Draw-Tite trailer hitch # 24965 will fit the 2016 Hyundai Sonata including hybrids but excluding plug-in models. I checked with Hyundai and they only say that towing with this vehicle is not recommended and they do not provide a capacity. They don't say you can't tow though. If you do want to tow then the trailer hitch does not come with the proper ball mount. For a 1-7/8 inch ball use # 19256 and for a 2 inch ball use # 19258. And for trailer wiring use # C56390 for hybrid models or...
    view full answer...

Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Dustin K
Video by:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Ronnie R
Updated by:
Ronnie R
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Amanda M
Written by:
Amanda M
Employee David F
Test Fit:
David F

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