Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Item # C55381

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  • Custom Fit
  • Trailer Hitch Wiring
  • Curt
  • 4 Flat
  • No Converter
Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into 7-way OEM tow package wiring harness - no cutting, splicing or tapping required. Call 800-298-8924 to order Curt custom fit vehicle wiring part number C55381 or order online at Free expert support on all Curt products. Guaranteed Lowest Price and Fastest Shipping for Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector. Custom Fit Vehicle Wiring reviews from real customers.

  • All Info
  • Reviews (6)
  • Q & A (11)
  • Videos (1)
  • Photos
  • Why etrailer?

Curt Custom Fit Vehicle Wiring - C55381

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into 7-way OEM tow package wiring harness - no cutting, splicing or tapping required.


  • Provides a 4-way flat trailer connector at the back of your vehicle to power your trailer's signal lights
    • Designed for use with a factory tow package that has a 7-way connector
    • Retains 7-way connector functionality
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection points behind rear bumper
    • Plug in T-connector
  • Comes with dust cap for 4-way flat connector
  • Limited 1-year warranty


This custom-fit T-connector plugs into your vehicle's factory tow package wiring harness, which is located behind the rear bumper. Simply plug the harness in-line with your existing 7-way wiring harness.

Once installation is complete, the 4-way connector will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket (sold separately) is recommended to keep the connector secure.

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.

55381 CURT T-Connector - OE 4-Flat Upgrade

C55381 Installation InstructionsInstallation Details C55381 Installation instructions

This Product Fits The Following Vehicles

2002 - 2002 Dodge Ram Pickup 1500 with factory 7-Way

2001 - 2003 Dodge Van Full Size with Standard Bumper

2007 - 2008 Chrysler Aspen with factory 7-Way

2000 - 2007 Dodge Durango with factory 7-Way

2005 - 2008 Jeep Liberty with factory 7-Way

2006 - 2009 Mitsubishi Raider with factory 7-Way

2003 - 2009 Dodge Sprinter with factory 7-Way

2003 - 2009 Freightliner Sprinter with factory 7-Way

2010 - 2010 Ram 3500 with factory 7-Way

2010 - 2018 Ram 4500 with factory 7-Way

2010 - 2018 Ram 5500 with factory 7-Way

2001 - 2003 Dodge Van with factory 7-Way

2002 - 2010 Dodge Ram Pickup 2500 and 3500 Pickup with factory 7-Way

2000 - 2009 Dodge Dakota with factory 7-Way

2000 - 2008 Dodge Ram Pickup Pickup with factory 7-Way

2006 - 2010 Jeep Commander with factory 7-Way

2004 - 2008 Chrysler Pacifica with factory 7-Way

2000 - 2010 Jeep Grand Cherokee with factory Tow Package

2001 - 2003 Dodge Van Full Size with Factory Step Bumper

California residents: click here

Video of Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Curt Custom Fit Vehicle Wiring - Trailer Hitch Wiring - C55381 Review

Today we're going to be taking a look at the Curt T-Connector Vehicle Wiring Harness for our factory tool package. This is going to provide you a 4-pole flat trailer connector. This product is going to fit in multiple vehicles, so please use the Vehicle Fit Guide, located at, to see if this is a fit for your particular vehicle. It's going to provide a 4-way flat trailer connector at the back of your vehicle, that's going to power your trailer signal lights. This is designed for use with the factory tool package that already has a 7-way connector. When installing this, this does retain the 7-way connector functionality, and it's going to come with a dust cap for the 4-way flat connector, that way you can cover up the connection points when your pole is not being used. A benefit of this system is how easily it installs, you don't have to worry about cutting or splicing any wires.

Just locate the connection points behind the rear bumper, take these large connectors, and plug them into the connectors on the vehicle. They're going to match up perfectly, they're going to snap lock together for a nice, tight, secure fit. Then you can simply just use the included zip ties, to secure the excess wires that you may have. Once your install is complete, the 4-way connector is going to be stowed beneath your vehicle and the other trailer hitch, you can loop it around the safety chain loop, or you can purchase a mounting bracket. Mounting brackets are sold separately, but they are recommended to help keep the connectors secure. It is also recommended that you use a small amount of dielectric grease on all your electrical connections, like the plugs on the vehicle, and the 4-pole connector itself, and that's going to help prevent corrosion.

If you need some of that, you can find it right here at, that's going to be sold separately. That's going to do it for our look at the Curt T-Connector Vehicle Wiring Harness for factory tool packages, which is going to provide your 4-pole flat trailer connector.

Customer Reviews

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector - C55381

Average Customer Rating:  5.0 out of 5 stars   (6 Customer Reviews)

Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. T-connector plugs directly into 7-way OEM tow package wiring harness - no cutting, splicing or tapping required.

- C55381

I am impressed with this company's professionalism. They kept me informed from start to finish with emails and tracking info. The product is just as advertised and expected. 521623

- C55381

Exactly what was advertised and arrived in 2 days 425687

- C55381

product was received in a timely manner and was exactly as advertised. Thank you for the great service. 408416

- C55381

Product as described,, super fast shipping :)++++++ 346477

- C55381
2008 Dodge Dakota

Sales, service and product all excellent 186256

- C55381
2007 Dodge Ram Pickup

Fantastic company and great quality products. I will say also if u need support etrailer is there to help. 141259


Ask the Experts about this Curt Custom Fit Vehicle Wiring
Do you have a question about this Custom Fit Vehicle Wiring?

  • Trailer Wiring Harness for a 2007 Dodge Durango without Factory Tow Package
  • Curt trailer wiring harness # C55381 will only fit your 2007 Dodge Durango if it came with the factory tow package. If you cannot find that factory connector anywhere then it is likely that your model does not have the factory tow package and you will need a different harness. For a model without the factory tow package I recommend Tow Ready wiring harness # 118390. I have included a link to a video showing how it installs as well as a link to the installation instructions for you.
    view full answer...

  • Recommendation for a Trailer Hitch to Fit a 2007 Dodge Ram 1500 Truck
  • For your 2007 Dodge Ram 1500, we carry a couple different trailer hitches. The Curt Class III Hitch, # 13333, is a custom-fit hitch that uses a bolt-on mount to connect to your Ram truck. The hitch has a gross towing capacity of 6,000 lbs and a tongue weight rating of 600 lbs. This hitch has a 2 x 2 inch receiver opening. Curt also has a Class IV hitch, # 14361, that has a gross towing weight of 10,000 lbs and a tongue weight of 1,000 lbs. This hitch might be the best option for your...
    view full answer...

  • Where on 2006 Jeep Grand Cherokee to Connect Curt 4-Pole Trailer Wiring Harness # C55381
  • Trailer wiring harnesses like the Curt # C55381 that have a T-connector allow for quick plug-in installation at the rear of the vehicle. This harness connects to wiring located under the vehicle, behind the bumper on the drivers side. The harness will have a connector similar to that on the Curt harness. Locate the 7-way trailer connector at the rear bumper; please refer to the photo provided. You can loosen the mounting bracket to give you better access to the connector. Press the red...
    view full answer...

  • Curt Trailer Wiring Harnesses that Fit 2004 Dodge Dakota
  • If your 2004 Dodge Dakota has a factory 7-way the trailer wiring harness part # C55381 would fit and work well to provide you with a 4-way. If instead you did not have a 7-way you would want the part # 55323 which plugs inline with the taillight harnesses of your truck.
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2001 Jeep Grand Cherokee Limited
  • There are many wiring harnesses available for your 2001 Jeep Grand Cherokee Limited, but in order to determine which wiring harness is correct for your truck, we will want to know what your truck was originally equipped with. The Curt T-Connector Wiring Harness, # C55381, was designed for models that were equipped with a factory tow package. If your Jeep came with a factory tow package and trailer wiring and you are looking to replace a wiring harness, then this is the correct harness...
    view full answer...

  • Adding a 4- and 7-Way Connector and Brake Controller to a 2009 Nissan Pathfinder with 4-Way Only
  • Since your 2009 Nissan Pathfinder already has a factory 4-Way you can use # 118267 to install a 7-Way. But to retain the use of a 4-Way you would need to replace the 7-Way that comes with the harness with # HM40950. Or you could use an adapter like you said such as # PK12716. It is not likely that the 7-Way or 7-Way and 4-Way would fit in the factory location but # HM40950 does have a mounting bracket included. For a brake controller I highly recommend a proportional controller over...
    view full answer...

  • Replacement 4-Way Flat Trailer Connector Compatible with Factory Wiring for 2007 Dodge Ram 1500
  • As long as your 2007 Dodge Ram 1500 has the factory wiring harness at the rear of the vehicle that the Curt T-Connector Vehicle Wiring Harness # C55381 can install into, this wiring harness will work well to replace the existing 4-Way flat connector on your vehicle.
    view full answer...

  • Correct Trailer Hitch for 2003 Dodge Ram 1500 Built in July 2002
  • The Curt hitch # 13326 that you referenced is indeed the correct Class III hitch for your 2003 Dodge Ram 1500 built in July 2002. This hitch offers a 500-lb tongue weight (TW) capacity and includes the required installation hardware. I have linked an installation video for you showing an application in your same truck. Two helpful hitch installation articles are included as well. If you'll be towing you'll need a ball mount and hitch ball. The recommended ball mount for this hitch is...
    view full answer...

  • How to Confirm Trailer Wiring Configuration to Match 2007 Jeep Grand Cherokee
  • Trailer wiring often uses a particular wire color for a particular function, such as a white wire for ground, but there is no absolute rule that this will be the case. For this reason testing with a circuit tester like # 40376 is recommended. In the case of a trailer you can use a spare battery (or your Grand Cherokee battery) to test each trailer circuit to see what light activates with the 12V input power applied. The linked trailer wiring article illustrates the various connector...
    view full answer...

  • How is Red Locking Tab of Curt Trailer Wiring Harness Manipulated to Unplug Connector
  • The red tab on the Curt T-Connector Vehicle Wiring Harness # C55381 needs to be carefully pressed sideways to release it so that the connectors can be pulled apart according to the instructions for this kit.
    view full answer...

  • Troubleshooting Trailer Lighting with 4-Pole Connector and 2008 Jeep Grand Cherokee
  • The most common causes for trailer lighting issues like yours are corrosion on one or both of the connectors or a bad ground connection at the car or trailer. The linked article may be helpful to you as you troubleshoot. When troubleshooting trailer lighting it is usually easiest to disconnect the trailer from the vehicle and test each individually. Inspect both car and trailer side connectors for even slight greenish or whitish discoloration on the contacts. Clean as required; you can...
    view full answer...

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

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Info for this part was:

Edited by:
Leah B
Written by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Installed by:
Cole B
Updated by:
Sarah W
Expert Research:
Victoria B
Updated by:
Kristina F

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