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  4. Trailer Hitch Wiring
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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 # C55515
Our Price: $18.08
You Save: 51%
Custom Fit Vehicle Wiring

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Quickly and easily install a 4-way trailer connector on your vehicle with this custom harness. Connector plugs directly into OEM tow package port - no cutting, splicing or tapping required. 1-800-940-8924 to order CURT custom fit vehicle wiring part number C55515 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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CURT Custom Fit Vehicle Wiring - C55515

  • 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. Connector plugs directly into OEM tow package port - 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
    • Compatible with 5-pole, 6-pole and 7-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point behind rear bumper
    • Plug in 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, along the driver's-side frame rail.

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 plug on your automobile and the 4-pole connector itself - to help prevent corrosion.

55515 Curt T-Connector - OE Replacement 4-Flat

Installation Details C55515 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 - C55515

Average Customer Rating:  4.8 out of 5 stars   (168 Customer Reviews)

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


Easy install, great product - no issues yet. Recommended.


Plug and play is all I need to say.


Good Quality!



Very good, No problems!


This was a quarter of the price that Jeep wanted to sell it to me for and with some personal modifications/additional wiring I now have two versatile means of hooking up my trailer lights!


Great product/fantastic service


Plug n Play once you turn on the trailer functions in the computer... dealer wanted $175 to enable the lights. It can be done DIY for around $20.

2014 Jeep Grand Cherokee

Excellent product and very straightforward to install. Opted for the Curt T-Connector C55515 and will have my dealer flash computer to recognize new configuration. Already used hitch with trailer to haul several heavy items up to about 2000lbs with no trouble whatsoever. Should have got this years ago!

2014 Jeep Grand Cherokee

Fast shipping, easy install, product as described. The only complaint was the need to take the vehicle (2014 Jeep Grand Cherokee) to dealer for ECU flash. I know this is not Etrailer's fault so not knocking them. I just hope to save other people time in the future if they think they are just able to plug in and tow.

Timothy B.


8/02/2016 Update - replaced the 2014 Grand Cherokee with a 2016 Grand Cherokee, forced dealer to swap the hitch and wiring from old jeep to new jeep as part of the deal. Item still working as described, no complaints.

2013 Jeep Grand Cherokee

Item was great and worked like a charm. Only problem was the vehicle. I used it on a 2013 Jeep Grand Cherokee. The vehicle came standard with the 7 pin connecter but since it didn't come with the "towing package", the dealer had to reprogram the system to start sending voltage to the vehicle connector.



What was the cost to have the grand cherokee reprogrammed, and how long did the reprogram take?



Jim the dealer charged $50 and it only took about 10 minutes once they figured out the problem. They spent about 4 hours figure it out tho.


avalanche owners,easy too install i highly suggest when installing pull the cable through the hitch its open at the end less wire being exposed,(this is from my experience) other than that i am very happy with an troop,Patrick B,an everyone at provided great costumer service i will be buying from them soon.

Jason G.


Still working after the harsh new England weather we had still works I highly recommend there products also I willing be putting in an order for a new Chevy light up logo so get ready


I was not aware at the time i purchased this item that it was not what i needed. The page told me i needed this item to complete my set up so i bought it. little did i know that my vehicle does not have a factory wiring harness so what i bought was useless. I am going to have to return this item. The page should also make it more clear of what you may need before you purchase something and you wait almost 2 weeks for it to arrive. I had to order what i needed else ware to be here when I need it to be.

Etrailer Expert

Heather A.


Thank you for your review. The 2019 Dodge Durango does need a factory towing package to use this wiring harness. Since the 2019 Dodge Durango does not have the factory towing package you will need part Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector part C56336.

2014 Jeep Grand Cherokee

Question for you please. The hitch itself has been great, but I can't get the wiring harness for the lights to work on the trailer. I'm reading different things online, sounds like my Grand Cherokee may have to be programmed for the lights to work? Are you familiar with that? Is that the case?

Thanks in advance!


I chose the Draw tight Max Frame Trailer Hitch for its known quality, i like it comes powder coated to reduce unsightly rust and to keep that fresh look.
I chose the this hitch for my all around light and heavy duty needs.
The Draw Tight Ball Mount is a quality enhancement to this hitch.
I chose the 2" chrome ball for its quality and appearance.
The Curt C55515 wire connector was the best choice for my lighting needs.

GMC Terrain

The connector was as described ,no splice and simple. Also i ordered one for my Terrain and a class 2 hitch. Although the harness for the car was the wrong part,the customer service dept. took care of it immediately and it fit and installed with ease. The hitch went on with no problems and their videos showed everything you need to do. These guys will get my business from now on. a+++

2006 Ford Ranger

Decent looking product. Would have been even better if it worked as advertised. Does not plug into my 2006 Ranger with tow package. offered to refund the purchase price minus the original shipping cost, plus I had to foot the bill to ship it back. It would have cost more than it's worth. No thanks, I'll just use the pigtail and hard wire it.

Etrailer customer service was very prompt in responding, not that it did me any good.

2017 Dodge Durango

Installation went well. You will need to cut the spare tire splash cover. Its made of plastic and was easy to cut in place with a, multi tool saw.
Also the Curt T- wiring harness # C55515 plugged in easy as well.
I would also recommend the mounting bracket # 18144 for a nice clean job.
On the 2017 Durango you will have to have the dealer activate the tow plug (flashing the computer ).

2014 Jeep Grand Cherokee

Trailer hitch fit like a glove and looks great. The wiring harness was exact fit and will have to go to the dealer and have the vehicle part of the wiring turned on. Instruction and video on e-trailer helped a lot to determine my needs and installation.


Great service.

2014 Jeep Grand Cherokee

Works perfectly! Pulled the cover off the existing plug on my 2014 Grand Cherokee (up under the rear of the vehicle) and this plugged right in.

NOTE: You may have to have the computer flashed by the dealer to enable trailer lighting. This cost me about $45 at a local Dodge dealer.

2017 Dodge Durango

Installation of the T-Connector was extremely easy once I released the lock that held the factory cover in place, however, I don't recall seeing mention of the fact that the dealer has to "flash the ECU" [computer] to enable and turn on the factory wiring harness. I spent quite a bit of time troubleshooting no lights before finding mention of this on the internet and confirmed with a dealership that wanted $160 to do this work.

2003 Chevrolet Silverado

Product was easy to install into the Chev Silverado's existing wire harness. The provided zip ties allowed me to route the 4-wire unit beside existing wiring to the hitch receiver area. Be sure to review the provided videos on simple installation.


After going to many auto stores trying to track down this wiring harness I finally found it at Etrailer. Had the part in my hands before they said it would arrive. Could not beat the price. Thanks again Etrailer.


No lights after installation. Don't think it was product's fault. Dealer told me vehicle did not have module for trailer lights, even though it had the connection for your harness. Ugh!

2014 Jeep Grand Cherokee

Shipped on time. Installed very easily with help from the video tutorial. Works great and easy to connect trailer on and off that is after I went to the dealership so to activate the trailer lights from the computer because I did not have the tow package when I initially bought the car.


First time using etrailer and had everything I needed and it arrived a lot faster than estimated. Highly recommended and will be using them again in the future

Show More Reviews

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

  • Troubleshooting Trailer Wiring of 2015 Grand Cherokee That Stopped Working
    If your factory trailer wiring stopped working it's most likely due to blown fuses or relays under the hood of your 2015 Jeep Grand Cherokee. That's what I would check first. From there if everything looks good it would be time to go to a dealer to see if anything needs to be reflashed. Older Ram trucks used to require their TIPM to be reset if the trailer wiring ever experienced a short.
    view full answer...
  • No Trailer Running Lights on a 2012 Jeep Grand Cherokee
    If all of the trailer lights are working except the running lights then there could be a few potential causes. For starters, I would check that the trailer running light fuse on your 2012 Jeep Grand Cherokee to make sure it is intact. If this is not the problem then you will want to check the pins inside each trailer connector in addition to the wires leading into the back of them. The wires need to be tight without much play while pulling them and the pins need to be straight and free...
    view full answer...
  • Trailer Wiring Does Not Work On My 2014 Jeep Grand Cherokee
    The dealership is correct in a sense. Even though your 2014 Jeep Grand Cherokee has the factory tow package wiring, the wiring may not be activated. You may have to take the vehicle to the dealership so they can program the computer to activate the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector Item # C55515. Should only take about 10 minutes. It is not uncommon on some vehicles that have factory tow package wiring and it not be activated....
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  • Troubleshooting Trailer Wiring that Intermittently Works On Trailer While Towing
    Trailer wiring can ground through the ball of a trailer, but since it's not a reliable ground and it can be intermittent (exactly like what you described), it is better to have everything ground properly through the wiring of the trailer harness. The wiring of your trailer should have a ground wire that is securely run to an unpainted metal surface on your trailer. Improving this ground will fix the problem you described. You can also try running a jumper wire from each of your light assemblies...
    view full answer...
  • What Is Total Length Of Curt T-Connector Vehicle Wiring Harness Item # C55515
    I confirmed with Curt that the total length of the Curt T-Connector Vehicle Harness, Item # C55515, is 37 inches from end to end. It will plug directly into your OEM tow package port with no splicing required. Let me know if you have any other questions.
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2006 GMC Envoy
    All of the wiring harness products for your 2006 GMC Envoy are shown on the linked page and all use the same type of round U.S. Car connector for installation. Please refer to the linked photo. All of these harnesses are the plug-and-play variety that require no cutting of splicing of wires. The Curt harness # C55515 will plug into your U.S. Car connector and provide a 4-pole flat type trailer connector for stop, turn and tail light signals for a trailer. I linked a helpful article concerning...
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  • Is the Curt T-Connector part # C55515 Compatible with a 2002 Chevy Silverado
    As long as you have a factory 7-way at the rear of your 2002 Chevy Silverado yes, the Curt T-Connector part # C55515 that you referenced would work for you.
    view full answer...
  • Does Install of Trailer Wiring on 2017 Dodge Durango Require Dealer Activation
    The T-One trailer wiring harness part # 118617 is a confirmed fit for your 2017 Dodge Durango SXT and does not require any dealer activation. Just plug it inline like it needs and run the power wire and your good. I attached an install video for this for you to check out as well.
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  • How to Activate Factory Tow Package Wiring on a 2017 Dodge Durango
    To activate the factory tow package wiring on your 2017 Dodge Durango you will most likely have to take the vehicle to the dealer and they can make it fully functional. Trailer wiring harness # C55515 is designed for models that already have the factory wiring activated. The other option for you is to use wiring harness # 118617 which plugs in line with the vehicle tail light wiring. I have included a link to a video showing an example installation of this harness.
    view full answer...
  • How to Activate Trailer Lights on 2014 Jeep Grand Cherokee Laredo with C55515 Wiring Harness
    I spoke with my contact at Curt and he said if you have installed the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 4-Pole Flat Trailer Connector # C55515, you will not need to do anything with the fuses to enable the trailer lights. However, you will need to take your vehicle to your Jeep dealer and have them reprogram the Jeep's computer to activate the trailer wiring harness. It will take about 10 minutes.
    view full answer...
  • Trailer Wiring Recommendation for 2014 Jeep Grand Cherokee that Does Not Need to Be Activated
    I have an easy solution that will take care of your trailer wiring on your 2014 Jeep Grand Cherokee with the Tekonsha kit part # 118727. This installs by plugging inline with the taillight connectors of the vehicle and does not integrate with any of the factory wiring so you wouldn't have to go to a dealer or worry about any of their packages being active. I attached an install video for this for you to check out as well.
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  • Will the Bumper Fascia Panel Need to be Removed When Installing Hitch on a 2017 Buick Enclave
    At the rear of many Buick Enclave models, there is a cover that is in the center of the bumper fascia. If you view the attached video and at the 0:25 second mark you will see our tech removing the panel. The removal of this panel may not be applicable to your model vehicle. For your 2017 Buick Enclave, I recommend the Curt Class III Trailer Receiver Hitch, # 13424. This hitch have the 2 x 2 inch receiver opening that will give up more choices of hitch accessories like bike racks and...
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  • Does Wiring Harness 118617 For 2020 Dodge Durango Require Dealer Activation
    Thank you for your purchase, and dealer activation is not required for your 2020 Dodge Durango in order to install the T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118617. I have added a link below to an install on a '20 Durango for you to check out as well which should be useful.
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  • 4-Way Trailer Connector Recommendation for a 2011 Chevy Traverse
    If you have a round trailer connector harness under the bumper of your 2011 Chevy Traverse the part # C55515 would work as a 4-way harness. If you can't find that connector you would use the part # 118450 for a 4-way harness. If you need to order something right now this harness would fit regardless of your setup.
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  • Trailer Right/Left Blinker Come On Together and Right Side has Constant Power in Trailer Connector
    It sounds like there is a combination of issues that are causing the problems you are experiencing. Regarding both blinkers going off together when you engage the left blinker, this could be a bad ground. Bad ground connections can cause all sorts of weird problems. Make sure that the truck side and trailer side connectors are properly grounded to clean and corrosion free bare metal surfaces. The truck ground is probably tied into the harness that leads to the connector so no worries if...
    view full answer...
  • Right Brake Light on 4-Pole Trailer Connector Not Working on 2004 GMC Sierra
    If your 2004 GMC Sierra uses a 4-pole flat trailer connector like the Tow Ready # 118384 that you referenced the right turn and right brake light signals both will be carried on the green wire. Please refer to the linked photo. The most common cause for one light function (the right turn light) to work while another carried on the same wire (the right brake light) does NOT work is a bad ground connection. Turn signals do not pull as much current as a brake light signal, since turn signals...
    view full answer...
    Image 1 for
  • Does Trailer Wiring for 2014 Jeep Cherokee Require Dealership Computer Programming
    If you are using any of the trailer wiring harnesses we offer like the # C55515 or # C56208 which fit your 2014 Jeep Cherokee you would not be required to reprogram anything.
    view full answer...
  • Adding a 4-Way Trailer Connector to a 2014 Jeep Grand Cherokee that Did Not Come with Tow Package
    All of the trailer wiring harnesses for the 2014 Jeep Grand Cherokee including # C55515 are designed to fit in place of the factory 7-Way. Since your Jeep did not come with a factory 7-Way you may need to have the dealer reprogram the computer to activate the trailer wiring harness. The harness will plug into the connector though.
    view full answer...
  • Troubleshooting No Trailer Wiring Turn Signals on 2012 Jeep Grand Cherokee Factory Trailer Wiring
    Most likely it's a blown fuse under the hood of your 2012 Jeep Grand Cherokee for the trailer wiring turn signals. You can check there and replace as needed. The other possibility is that the trailer wiring connector is damaged and is in need of being replaced. I'd first check all of the pins on the connector for corrosion and clean as needed with sandpaper though. But if when you are there you see that the connector is overall in bad shape it's probably just better and easier to replace...
    view full answer...
  • How to Tow a Trailer with a 4-Way Flat Connector with a 2010 Buick Enclave with 7-Way Connector
    To convert the 7-way trailer connector on your 2010 Buick Enclave to a 4-way flat connector, you can use the Hopkins 7-Way RV to 4-Way Flat Trailer Connector Adapter, # HM47365. This adapter will allow you to power the lights on your trailer without having to install a new wiring harness on your vehicle. This way you can tow a trailer with a 7-way in the future if needed.
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    Image 1 for
  • Recommended 4-Way Wiring Harnesses for a 2007 Ford Ranger w/ and w/out the Tow Package
    Installing the Curt T-Connector Vehicle Wiring Harness item # C55515 will not require you to flash the ecu on your 2007 Ford Ranger. This harness installs on the Ford Ranger's with the factory tow package. If your truck didn't come with a 4-way or 7-way connector you will need the Hopkins Plug-In Simple Vehicle Wiring Harness item # HM40655. This harness does not require the ecu to be flashed either.
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  • 4-Way and 7-Way Connector Recommendation for a 2003 Chevy Trailblazer
    What you have is the twist lock style of 7-way bracket on your 2003 Chevy Trailblazer. If you want to use the # C55515 you will need to find a way to secure it with zip ties. Or you could go with the # HM40920 as this is a 7-way and 4-way connector that will plug into your harness and can use the twist lock mounting bracket.
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    Image 1 for
  • Recommended 4-Way Wiring Harness for Towing With 2013 Buick Enclave
    It sounds like you do not have a factory trailer connector on your 2013 Buick Enclave. If that is correct, I recommend the T-One Vehicle Wiring Harness # 118270. I would choose the Tekonsha wiring over other options since we have found them to be the most reliable. This wiring harness plugs into the connection point beneath your vehicle along the frame rail. It also includes the necessary fuses and relays for installing. If you do have the factory tow package and OEM tow package port...
    view full answer...
  • 4-Pole Trailer Wiring Harness for 2006 Ford Ranger
    The Hopkins Plug-In Simple Vehicle 4-Pole Wiring Harness # HM40655 is intended for vehicles without any factory tow package wiring, although it could still be installed in a truck that does have this feature. This item installs by plugging in to the vehicle at its taillight wiring connectors rather than at the round U.S. Car connector that would be found tucked up under the rear bumper on a tow-package-equipped vehicle. For a vehicle with that round connector (see photo please) you could...
    view full answer...
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