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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. 4 Flat
  4. 6 Round
  5. Factory Tow Package
  6. Trailer Hitch Wiring
THIS ITEM IS NOT A FIT FOR
2009 Dodge Caliber
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CURT

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 6-Way Round and 4-Flat Connectors

$32.81
Custom Fit Vehicle Wiring
Not Confirmed to Fit

2009 Dodge Caliber

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etrailer Installation
We'll connect you with nearby partnered installers who know this exact setup.
Quickly and easily install a 6-way and a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55664 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 for Factory Tow Package - 6-Way Round and 4-Flat Connectors. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (3)
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CURT Custom Fit Vehicle Wiring

Highlights

  • Custom Fit for Your Vehicle: Works with your vehicle's wiring
  • Tow Multiple Trailer Types: Dual 6-way round and 4-flat sockets let you connect different trailers.
  • Plug-and-Play Install: T-connector plugs into your factory USCAR port—no splicing needed.
  • Clean Factory Fit: Mounts directly to the existing tow-package plug for a secure, OEM-style hookup.
  • Flexible Wiring Options: Center pin on 6-way can be used for 12V power or reverse signal as needed.
  • Reliable Trailer Lighting: Provides proper power paths for running, turn, and brake light functions.

Features to know about

Adds a 6-Way and 4-Flat Connector in One Plug: Dual Trailer Connection

When you need to tow more than one type of trailer, switching connectors can be a pain. This harness gives you both a 6-way round and a 4-flat connector on the same plug so you can hook up different trailers without swapping parts. It’s a simple way to cover multiple wiring setups using one connection point.

Quick Setup for Factory Tow Packages: Plug-In USCAR Connection

If your vehicle already has a factory tow package, this harness plugs right into the existing USCAR socket behind the bumper. There’s no cutting or splicing—just connect the plug and you’re ready to go. It’s made to fit directly into the factory wiring so everything lines up cleanly and works the way it should.

Ready for Power or Brake Signals: 6-Way Round Flexibility

The 6-way round connector supports circuits for running lights, turn signals, brakes, and auxiliary power. If you’re not using the center pin for 12V power, you can wire it for a reverse signal instead. This setup keeps things flexible depending on how your trailer is wired while giving you solid, reliable connections each time you plug in.

Durable Vehicle-End Connector: Built to Handle Regular Use

The Curt design uses solid terminals and tight-fitting plugs that hold up well to frequent hookups. It’s made for the vehicle end of your wiring, so it stays secure even with repeated connections outdoors. You get reliable trailer lighting and function every time you tow.

55664 Curt T-Connector - OE Multi-Socket Upgrade

Similar to Hopkins 40965

Item # C55664

Installation Details C55664 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:

Ratings & Reviews

5.0

3 reviews
Review sort icon
Quickly and easily install a 6-way and a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package wiring harness - no cutting, splicing or tapping required.

by:



by:

It appears to be perfect for my Jeep Grand Cherokee Excellent price too! Thank You



by:

Best retailer ever


3
3

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

  • Hitch and Wiring for 2025 Jeep Gladiator Sport
    Hey Ed, thanks for asking. Curt Trailer Hitch # C74DR does not come with trailer wiring but no worries, we have custom fit wiring harnesses for vehicles. Curt T-Connector Wiring Harness with 6 Way Round and 4 Flat Connectors # C55664 is for Gladiators with the factory tow package. The factory connector is usually located underneath the rear bumper near the hitch receiver. Curt T-Connector Wiring Harness with 4-Pole Flat Trailer Connector # 56407 is for Gladiators without the factory...
    view full answer...
  • 2013 F-150 XLT W/Towing Package What Do I Need To Pull Both A 4 And 6 Way Trailer
    Yes, the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55664 will work depending on the way your 4-way plugs in. If you have the standard US car connector, then yes this will do the trick. If you don't have that car connector, I recommend the Universal Installation Kit for Trailer Brake Controller # ETBC6. This kit includes all parts necessary to install an electric trailer brake controller in your vehicle. Plus, A 6-Way connector. If you are not wanting to use...
    view full answer...
  • Recommended Trailer Wiring And Brake Controller For A 2023 Ford Explorer XLT
    Hey Aaron, If your 2023 Ford Explorer XLT has a factory tow package connector back at the rear of the vehicle then you can use the Curt T-Connector Vehicle Wiring Harness # C55664. If you don't have a factory tow package connector then you'll first need to install the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56093. This has connectors that will plug into your tail light wiring and will have one wire to run up to the battery for power. Once installed...
    view full answer...
  • Recommended Trailer Hitch Wiring Harness For A 2019 Jeep Grand Cherokee
    Hey Mike, The Curt T-Connector Vehicle Wiring Harness # C55349 is designed to fit 1994 - 1998 Jeep Grand Cherokee's. Your 2019 Jeep Grand Cherokee would need the Curt T-Connector Vehicle Wiring Harness # C55664 if you have the factory tow package or the Curt T-Connector Vehicle Wiring Harness # C62VR if you do not.
    view full answer...
  • Can Reverse Light Wire on Silverado be Connected to 6-Way Connector
    A 6-Way connector like what is on the Curt T-Connector # C55664 that you referenced doesn't technically have a dedicated pin for the reverse light wire. If you aren't using the center pin for 12V power then you could wire the light green wire from the truck to this pin to use for the reverse signal. You will just need to make sure that the trailer side 6-Way is wired in this manner as well. If you have no need for the reverse circuit on the trailer (many do not) then this wire just doesn't...
    view full answer...
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  • How to Add a 6-Pin Connector to a Vehicle w/ a Factory Tow Package
    To add a 6-way round connector to your Silverado you will want the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package item # C55664. This vehicle connector plugs into the USCAR socket that comes with all vehicles that have a 7-way connector from the factory and/or the factory towing package.
    view full answer...
  • Adapting 4-Way of Tow Vehicle to 6-Way of Camper Trailer
    The adapter you are in need of is the part # A10-6034VP as this will adapt the 4-way of your tow vehicle to the 6-way of your trailer and will allow your trailer's taillights to function. I attached a review video for this for you to check out as well.
    view full answer...
    Image 1 for
  • 6-Way Round and 4-Way Flat Connector For a 2004 Dodge Ram Pickup
    Rather than having to hardwire you can still plug into the factory wiring harness on your 2004 Dodge Ram with the CURT Dodge OEM Harness # C57300. This will allow you to connect the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55664 giving you both the 6-way and 4-way connections that you are looking for.
    view full answer...
  • Adding a 6- and 4-Way or 7- and 4-Way Trailer Connector to a 2004 Ford F-150 Crew Cab 4x4
    The instructions for Curt 6-Way Round and 4-Flat Connectors # C55664 is listed only for certain GM vehicles and some imports (see instructions link for the list) but not for a 2004 Ford F-150. However, it should still work because it has the same connector to plug into the factory harness as # C55774 which is a 7- and 4-Way that is listed as a fit for a 2004 Ford F-150 that came with a factory 7-Way. If your truck came with a 4-Way then you would not be able to use either connector but...
    view full answer...
  • Parts Needed to Add 7-Way Trailer Socket to 1996 Jeep Grand Cherokee
    If your 1996 Jeep Grand Cherokee has no factory trailer wiring you'll need just two items to add a fully functional 7-way (female) trailer socket, basic 4-pole kit # 118349 and 7-way kit # ETBC7. The 4-pole installation consists of plugging in connectors at your tail lights and making one 12V power wire connection to the battery. Kit # 118349 has all the parts needed including wire and connectors. Then # ETBC7 will plug in to the 4-pole plug and provide the parts to make the connections...
    view full answer...
  • Recommended Curt Trailer Wiring Harness for a 2020 Ram 2500
    Hey T, a Curt wiring harness you can use with the Curt Trailer Hitch # C14258 is the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55664. This wiring harness is assembled in the USA, provides both a 6 way round and a 4 pole connector at the back of your vehicle, and includes the mounting bracket and hardware.
    view full answer...
  • Where to Plug in Curt Wiring Harness 55664 on 2015 Ford Explorer
    I have linked the installation instructions of the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 6-Way Round and 4-Flat Connectors # C55664 for you to take a look at. This plugs into the USCAR connector on your '15 Ford Explorer which should be right behind your bumper, towards the driver's side of your vehicle.
    view full answer...

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


Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Steven C
Installed by:
Steven C
Employee Matthew B
Installed by:
Matthew B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee John S
Video by:
John S

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