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  1. Custom Fit Vehicle Wiring
  2. CURT
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. No Converter
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
Our Price: $30.42
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Custom Fit Vehicle Wiring

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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 7-way OEM tow package wiring harness - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55381 or order online at Free expert support on all CURT products. Great prices 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.
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  • Reviews (18)
  • Q & A (0)
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CURT Custom Fit Vehicle Wiring - C55381

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • No Converter
  • CURT

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

Installation Details C55381 Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.6 out of 5 stars   (18 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.

2002 Dodge Van

Plugged right in - thank you!


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.


Used to replace the broken connector on my truck. Worked well

2007 Dodge Ram Pickup

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


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

2003 Dodge Durango

Paid for the 3-5 day delivery and got it by three days. Had friend help and we got it installed in about 20 minutes, no problems.


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


Works great

2008 Dodge Dakota

Sales, service and product all excellent


Exactly what was advertised and arrived in 2 days

2007 Jeep Commander



2003 Dodge Dakota

Great products



2002 Dodge Ram Pickup

2003 Dodge Durango


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

  • 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...
  • Troubleshooting Non-Functioning Left Side Tow Package Trailer Lighting Circuits on 2008 Jeep Command
    I'd start by going into the fuse block in the engine compartment. The fuses that protect the left trailer tow stop/turn signal circuits is located in location number 19 in that fuse box. Examine the fuse and replace if needed, but BEFORE plugging the trailer back in, you'll want to closely examine the wiring carrying the left side stop/turn/taillights on the trailer to find the short circuit that caused the fuse to blow in the first place. If you plug in the trailer without locating and...
    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...
  • Will A 4 Pole Connector Work If The Factory Tow Package Wiring Hasn't Been Activated.
    The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector Item # C55381 is not going to work on your 2006 Jeep Commander if you don't have the tow package wiring activated. Once activated it will work as it is designed to.
    view full answer...
  • 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...
  • Turn Signals on 2001 Jeep Grand Cherokee Stop Working After Towing Boat Trailer for Awhile
    You mentioned that you are towing a boat trailer. When you go to launch the boat are the trailer tail lights submerged under water and, if so, do you leave the trailer connected to the 2001 Jeep Grand Cherokee when launching the boat? If the answer to either question is yes then what could be happening is a short and/or interrupted ground from submerging the tail lights. Once it all dries out or you disconnect the trailer that problem goes away. If feasible you can try towing the boat...
    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...
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  • Parts Needed to 4-Way to 2019 Ram 5500 with Factory 7-Way
    To add a 4-way to your 2019 Ram 5500 you'd want to go with the part # 118384 which instead of plugging inline with the square connector would plug inline between the round connectors right behind the 7-way.
    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...
  • Trailer Connector Recommendation for 2004 Dodge Sprinter
    We don't offer any OEM products, but the Tekonsha # 20135 is a plug and play 7-way trailer connector that also offers a 4 pin trailer connector. This connector is compatible with your 2004 Dodge Sprinter. You'll find that this trailer connector is likely considerably less expensive than the OEM option, which typically doesn't offer a 4 pin connector in addition to the 7-way. If you click the provided link, you can see a description video of the # 20135 7-way/4 pin trailer connector I...
    view full answer...
  • How to Determine with 2006 Dodge Durango has Factory Tow Package
    If you already have a 7-Way connector at the rear of your 2006 Dodge Durango then the T-One # 118381 is the correct part. If you don't have a 7-Way then you would need the T-One # 118390 which is for an '06 Durango that doesn't have the tow package. This kit tees in right behind your tail light housing and pulls power directly from your battery to help protect the OEM wiring on your Durango. An installation video and the written instructions for both kits have been linked for you to...
    view full answer...
  • How to Pick Out Trailer Wiring for 2001 Jeep Grand Cherokee
    Sounds like you are trying to determine if your 2001 Jeep Grand Cherokee has the factory tow package so you can pick out the correct trailer wiring harness. Easiest way to tell would be to check to see if the vehicle has a factory trailer hitch and wiring installed on it currently. If so, then you'd have the tow package and the kit you'd want is the # 118381 which would plug inline with the 7-way you have to give you a 4-way. If instead you do not have either a hitch or wiring, you'd need...
    view full answer...
  • Troubleshooting Constant Right Turn/Stop Trailer Light Function on 2018 Jeep Wrangler
    Thank you for all of the insight, it really helps narrow down what we need to be looking for. I believe you are correct that the problem is on the vehicle wiring. If your 2018 Jeep Wrangler is a JK then you have something similar to the Curt # C55124 which is a simple tee solution but if you have the JL Wrangler then you have something like the Curt # C56407 which has the whole module setup. With the JK wiring I actually believe the issue might be on your OEM wiring but for the JL the...
    view full answer...
  • Wiring Harness Installation for 2004 Jeep Grand Cherokee
    If you have a factory tow package on your 2004 Jeep Grand Cherokee, installation is a simple quick connect into the existing wiring using something like the # C55381 or # 20135 depending on whether you want a 7 or 4 way pole connector. If you do not have a factory tow package, I recommend the # C55369 which can be connected into your vehicle's brake lights in the rear cargo area. See link below for installation video. We have several hitch options if you do not already have one. I...
    view full answer...
  • Installing Curt C55381 4-Pole Trailer Wiring Harness on 2006 Jeep Liberty.
    Remove the bolts or screws holding the existing 7-way trailer connector to its bracket, and locate the connector plugged into the rear of the 7-way. Find the red locking tab on the connector, and slide it to the side and pull the connector away from the 7-way plug. The plugs on the # C55381 would plug inline, so plug one end into the harness you unplugged and the other into the back of the 7-way. Be sure to slide those locking tabs back into place. Then, reattach the 7-way to its bracket. The...
    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...
  • Hitch and Replacement 7-Way Trailer Wiring Kit for 2001 Dodge Ram
    The Curt hitch part # C15300 is a confirmed fit for your 2001 Dodge Ram and would be a great choice with plenty of towing capacity. Then for a replacement 7-way you would want the part # HM42190.
    view full answer...
  • Trailer Hitch & Wiring For 2008 Dodge Dakota
    How much your 2008 Dodge Dakota can tow also depends on its model, cab size, and wheelbase, so it's not possible for me to answer what your towing capacity without all the information. A call to your local Dodge dealer should clarify it though. To tow use Curt Trailer Hitch Receiver # 13230 and Vehicle Wiring Harness # C55381.
    view full answer...
  • 7-Way Wiring Harness For a 2007 Dodge Durango That Does Not Have Factory Towing Prep
    I recommend the Hopkins Plug-In Simple Vehicle Wiring Harness # HM42245 to get the taillight functions for your 2007 Dodge Durango. This Harness will plug into the taillight connectors so that you will not have to splice the wiring on your factory harness. You will end up with a 4-way flat trailer connection. The Universal Installation Kit for Trailer Brake Controller # ETBC7 will accept the 4-way from the Hopkins harness and give you the remaining wiring necessary to complete the installation...
    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 part...
    view full answer...
  • Trailer Hitch Receiver and Wiring To Pull a U-Haul Trailer With a 2006 Dodge Ram 1500 Reg Cab 6' Bed
    Yes, the Curt Trailer Hitch Receiver # 14361 will fit your 2006 Dodge Ram 1500. It is a class IV 2" receiver that is rated for a trailer weight of 10,000lbs and 1,000lbs of tongue weight. With a weight distribution hitch the capacity increases to 12,000lbs of trailer weight and 1,200lbs of tongue weight. Be sure to reach out to a Dodge dealer with your VIN so that they can give you the maximum weight capacities of your Ram 1500. The Draw-Tite Ultra Frame Trailer Hitch Receiver # 41929...
    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 a...
    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 # PTW2993 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...

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