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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. Powered Converter
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 # C56399
Our Price: $76.66
You Save: 49%
Custom Fit Vehicle Wiring

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Shipping Weight: 1.86 lbs
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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. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C56399 or order online at 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.
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  • Reviews (19)
  • Q & A (0)
  • Photos

CURT Custom Fit Vehicle Wiring - C56399

  • Custom Fit
  • 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 powered tail light converter that connects directly to your battery to avoid overloading your 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: 3.0 amps per circuit
    • Tail lights: 6.0 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 tail lights to access these connection points. Once you've plugged in the T-connector, run the hot lead to your car battery, which can be found in your trunk on the passenger's side. 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 rear 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.

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.

56399 Curt T-Connector - Surface Mount Technology - 4 Wire

Installation Details C56399 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector - C56399

Average Customer Rating:  4.4 out of 5 stars   (19 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.


The trailer hitch works great. Had some problems with installation but that was due to something with the van not the trailer hitch.


Great harness, well constructed perfect fit on 2022 chrysler pacifica


Ordered from Alex great guy to talk to picked his brain for right hitch for my car and ordered . Thats why I order from E trailer you have all the right info

2022 Chrysler Pacifica

This is my second experience with etrailer. Purchased the same Curt hitch and wiring harness in 2018. The website is easy to use with a ton of information on installation. The shipping was fast and arrived in South Florida in 3 days. Very happy customer! Thank you.


Very easy to install and instructions are very clear.


tail light connectors did not match perfectly, but was able to shave off the tabs and make it work. might be because I ordered the kit for a different trim package. otherwise was very easy to install.

2017 Chrysler Pacifica

Product did not fit my Chrysler, even after utilizing the company’s website to confirm figment.

Ensure you call the company before placing order.

Etrailer Expert

Mike L.


The correct wiring harness for your 2017 Pacifica will depend on whether it has LED taillights or not. The # C56399 is for LX and Touring trims without LED taillights. If you DO have LED taillights, use the # C56322 harness, as the connectors on the vehicles taillight wiring are different.


I found that the paper instructions included with this kit were sub par compared to the product. I love how easy it was not having to do splices into my existing wiring harness. I think something that could be improved is the splice connectors having to be cut off to get it behind the bumper. It would almost be better to not have the pin connectors in the connector and just push them in the connector after you pull the wire. The videos do make the installation process much easier.


etrailer is a great place, from the products installed, the time it took to install,, to the people who worked with me. All were outstanding


Great product. Chrysler told me there wasn’t a harness available for my vehicle yet and was a waiting list to get it. I had to have it to pull a trailer on my vacation. Got it out on and installed and works great. Incredible customer Sevice.

2017 Chrysler Pacifica

Easy install on my 2017 Pacifica comes with everything you need. Ran into an issue where the two tangs on the plug at 11 and 1 oclock didn't line up, so i shaved them down and they fit no problem.

2018 Chrysler Pacifica

I get everything I ordered in the time and excelente condición







2021 Chrysler Pacifica


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

  • Wiring Kit That Fits 2017 Chrysler Pacifica LX
    Yes, I can confrim for you that the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56399 WILL fit your 2017 Chrysler Pacifica LX. This connector fits both the LX and the Touring models and will work for you.
    view full answer...
  • Trailer Wiring Harness that Fits 2020 Chrysler Voyager
    For your 2020 Chrysler Voyager that has the seventh VIN digit as D the correct trailer wiring install harness is the Curt # C56399.
    view full answer...
  • Correct Trailer Wiring Harness for 2019 Chrysler Pacifica
    Judging by the photo you've provided (thanks for the photo), you'll likely need the # C56399. Per fit information provided by Curt, the # C56399 which has the gray connectors is supposed to be a fit for the LX and the Touring models. I've provided a close-up shot of the connectors on the # C56399, when visually compared to what's shown in your photo it looks like a match. The folks at Curt tell me that if you could provide me with your VIN, They can look up your vehicle and determine which...
    view full answer...
    Image 1 for
  • 2017 Pacifica Limited Trailer Wiring Harness Custom Fit
    The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56322 is the only fit from Curt for your 2017 Pacifica Limited. The Curt # C56399 you ordered is only a fit for the LX and Touring trim models so it will not fit your Limited trim model. I've linked our return policy to help you get it exchanged for the correct harness.
    view full answer...
  • Which Curt Trailer Wiring Harness Fits 2020 Chrysler Pacifica Limited
    Curt has a trailer wiring kit that is a fit for your 2020 Chrysler Pacifica Limited but it's the part # C56322 and not the # C56399 that you referenced. Curt also has a hitch that fits your vehicle too with the part # C13383 as well.
    view full answer...
  • Recommended 2 Inch Trailer Hitch Receiver & Wiring For 2022 Chrysler Pacifica Touring
    We can definitely get your 2022 Chrysler Pacifica Touring set up with a Class III, 2 inch trailer hitch receiver as well as a 4-way wiring harness. Let's go ahead and start with the hitch, and the correct fit is from Curt: - Curt Trailer Hitch Receiver # C13383 Then for the 4-way and mounting bracket, the correct fit for your 2022 Pacifica Touring are the following: - T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56399 - Mounting Bracket 4-Pole Flat # 18144
    view full answer...
  • Does Curt 4-Way For 2017 Chrysler Pacifica Limited Work Without Being Connected to Battery
    The Curt T-Connector Vehicle Wiring Harness # C56399 does not fit your 2017 Chrysler Pacifica Limited, it is for the LX and Touring models; the correct part for your Limited is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56322. This connector will not work without being connected to the battery as this is how the converter is powered. So that is a necessary step, and the only other thing you'll need for towing is a hitch, the Trailer Hitch Receiver...
    view full answer...
  • Does Curt Trailer Hitch Receiver C65CR Fit A 2020 Chrysler Pacifica AWD Launch Edition?
    I checked with my contact at Curt and confirmed that the Curt Trailer Hitch Receiver - Custom Fit - Class III - 2" # C65CR you were looking at is a confirmed fit for your 2020 Chrysler Pacifica AWD Launch Edition. The # C65CR has a 400lb tongue weight rating and 4000lb trailer weight rating, or 500lb tongue weight rating and 5000lb trailer weight rating when using a weight distribution hitch making this a great option for carrying a bike rack, a cargo carrier, or even towing a trailer. If...
    view full answer...
  • Does etrailer Hitch Block Hands Free Lift Gate Sensor for 2020 Chrysler Pacifica
    Installation of the etrailer Hitch part # e98903 on your 2020 Chrysler Pacifica still allows for the hands free liftgate sensor to work but may limit the range of the sensor which may result in you having to put your foot near or around the hitch. To get you all set up I recommend a 2-inch ball mount. I have attached a link to determine what size ball you will need, how to decide what drop/rise amount you will need, and the page with all of our 2-inch ball mounts once you have your measurements....
    view full answer...
  • Trailer Hitch and Wiring for 2022 Chrysler Pacifica
    For your 2022 Chrysler Pacifica base model the Curt hitch part # C65CR is a really great option as it has the hidden crosstube. Then for trailer wiring the Tekonsha kit part # TK96FR is the easiest to install and most reliable.
    view full answer...
  • Parts Needed To Tow A Trailer With A 2021 Chrysler Pacifica Without The Factory Tow Package
    We have all of the parts you need! To be able to tow a trailer with your 2021 Chrysler Pacifica non-hybrid that does not have the tow package you will need a trailer hitch receiver, a vehicle wiring harness, and a ball mount, hitch ball, and hitch pin and clip. Starting with the trailer hitch receiver I recommend going with the Curt Trailer Hitch Receiver # C65CR due to it being made here in the USA, and having a hidden crosstube meaning once installed that the only visible part of the...
    view full answer...
  • Parts Needed To Install a 7-Way and Brake Controller on a 2018 Chrysler Pacifica
    To install a 7-way connector on your 2018 Chrysler Pacifica Hybrid you will first need the T-One Vehicle Wiring Harness # 118712. This will provide the turn signals, running lights and brake lights for the trailer. Next the Universal Installation Kit for Trailer Brake Controller # ETBC7 will provide you a 7-way that the 4-way connects to. It will also provide you with the wiring for a brake controller and charge line for the 7-way. I recommend the Redarc Tow-Pro Liberty Brake Controller...
    view full answer...
  • Flat Tow Set Up For 2017 GMC Sierra 1500
    I suggest these for your flat tow set up. The etrailer Invisible Base Plate Kit - Removable Arms # e98958. This gives you the base connection that makes the entire set up work. Next the Blue Ox Avail Non-Binding Tow Bar - Motorhome Mount - 2" Hitch - 10,000 lbs # BX7420 will couple with the base plate and your motorhome. Safety cables are included with this tow bar. For your braking system I recommend the Demco Stay-IN-Play DUO Supplemental Braking System w/ Wireless Coachlink Monitor...
    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 Jameson C
Expert Research:
Jameson C
Employee Cole B
Installed by:
Cole B
Employee Chris R
Video Edited:
Chris R
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 Conner L
Test Fit:
Conner L

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