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Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

Item # C55774
Our Price: $29.60
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Custom Fit Vehicle Wiring

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Quickly and easily install a 7-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. 1-800-496-5010 to order CURT custom fit vehicle wiring part number C55774 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 - 7-Way and 4-Pole Flat Connectors. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (544)
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  • Why etrailer?

CURT Custom Fit Vehicle Wiring - C55774

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 7 Round - Blade
  • No Converter
  • CURT

Quickly and easily install a 7-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.


  • Provides both a 7-way RV-style and a 4-pole 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 and 6-pole adapters (sold separately)
  • Connects quickly and easily - no cutting or splicing of wires
    • Locate connection point behind rear bumper
    • Plug in connector
  • Includes mounting bracket and hardware
  • Comes with protective covers for connectors
  • Assembled in the USA
  • Limited 1-year warranty


This custom-fit connector plugs into your vehicle's factory tow package wiring harness, which is located behind the rear bumper, on the driver's side.

Once installation is complete, the connectors will be stowed beneath your vehicle, near the trailer hitch. A mounting bracket is included to keep the connectors secure.

It is recommended that you use a small amount of grease on all electrical connections - the plug on your automobile and the 7-pole and 4-pole connectors - to help prevent corrosion.

55774 Curt T-Connector - OE Multi-Socket Upgrade

Installation Details C55774 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 - 7-Way and 4-Pole Flat Connectors - C55774

Average Customer Rating:  4.7 out of 5 stars   (544 Customer Reviews)

Quickly and easily install a 7-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.


The pigtail was easy to install and looked great. The problem was that it didn’t work without taking it to someone to program the computer to recognize it. That cost was going to be more than twice the cost of the connector. I still have it back in the box. I purchased a four wire flat connector and wired it up.

2003 GMC Yukon XL

I am having a problem with the install of the three Curt trailer components I purchased. I intentionally bought all of the same brand assuming that they would work together. The problem is that the Curt wiring harness (part# C55774) is too long and rigid. When the 7-pin connector is installed in the bracket that comes with it, it measure 5 inches until the black wire protective sleeve bends (to go under the hitch receiver frame).

The no-drill bracket (part# C57202) is supposed to attach the harness bracket to the hitch. But it is only 6.5" long, and the hitch tube is 3" wide. So with the bracket attached to the hitch, there is only 3.5" of space left to mount the harness bracket so that the screw holes line up.

I am disappointed that this is the case, especially as I called etrailer to check that the parts I was ordering would work together.

It looks like I will have to discard C57202 and drill two holes into the bottom of the hitch and mount the harness bracket directly. This is what I wanted to avoid - having to drill holes.

The 7-way bracket that comes with the wiring harness part # C55774 is designed to be installed with the wiring harness bracket hanging below the no drill bracket part # C57202. Since you are worried about the loose wiring I would recommend using some wire loom such as part # 459075-1 to protect your wiring and zip tie any slack with zip ties part # DW05726-25. I know this is not the option you wanted but I feel it is better than drilling into the hitch.
-- Etrailer Expert Heather A - 10/26/2018


Yeah etrailer did a wonderful job designing the complete towing system for my 2014 Jeep grand Cherokee. One for size pick up trucks are towing their travel trailers with their back and hanging down my grand Cherokee rides level.
I installed the entire system myself without too much difficulty. The only thing that had me baffled was the lights would not work because I did not know that you had to take the grand Cherokee to the dealership and have them reprogram the computer to “tow”.
Thank you!!


Purchased a 7 pin trailer connector for a Ford pickup. Was sent one that was supposed to be a perfect fit. It was not. I asked for a refund. Was asked to send pictures. etrailer disapproved my request even though the pictures showed that what they sent me was too short to fit. I will not ever purchase anything from this company again.


Easy to order, prompt delivery, exact fit, seller follow up to insure customer satisfaction. Etrailer operates the way we wish all companies would operate. They stay in business with the simple philosophy of taking care of their customer base and responding to their needs. Five Stars, easily!

2015 Jeep Grand Cherokee

Super easy, very nice! Great engineering, couldn’t have been any easier! The girls at etrailer are super friendly and very helpful! Great prices and quick shipping, too!!

Great. No problems.
Mike - 04/13/2019

Ford Transit Connect

Great wiring harness, I’m using it on my 2021 Ford Transit 250 for a year now,


Perfect fit. My truck was not equipped with a tow package so I was a little worried it wouldn’t fit. The wiring and plug were already there with a cap on it to seal it from dirt/water. Took the cap off and this harness snapped right in place. Also installed an etrailer hitch and new bumper. Very happy with the products and the installer tools and information provided by


It really is as simple as unplug the old connection, and plug in the new harness. The finished result looks factory.


Now that was a wierd setup. After installing the wiring kit, it wouldn't give me trailer lights. Took some research and frustration, and finally had to go to the Jeep dealership, to have them enable trailer tow wiring in my vehicles computer. Since then, nothing but success.


For what they are I rate these as excellent. Nothing fancy by no means but gets the job done. 8'6" X 34' enclosed trailer behind a 2005 1 ton dually Chevy


I purchased this harness to replace the original on my 2012 Ford Super-duty which had one loose pin. This fit perfectly, and solved my problem. Hopefully, this new Curt harness will last as long as the original.


Very easy install. The hardest part was getting the dealership to activate the wiring harness.


Great product. Installed on my 2018 Jeep GC. Because of dual 4 pin and 7 pin connector I don’t need an adaptor when swapping out trailers/camper. Clean look to it as well.


Gotten hundreds of dollars in stuff since I bought a motorhome.
Service is good and tech support has been great

As expected
Gregg - 04/06/2022

2018 Nissan Titan

I have a 2018 Nissan Titan, and while the connector was a perfect fit for connectivity to the factory connector. The Curt T-Connector wiring harness was about 6 inches short from connecting to the factory harness when mounted on the trailer hitch bracket. So, I was forced to mount it on the opposite side by drilling holes in bumper.


Did not fit my 2010 Toyota Tundra. Description confusing
Did not find one in catalog any better fit


Harness was easy to install. The truck came prewired. It just needed the adapter. We dremeled our the back of the bumper (2019 Titan’s have the cut our outlined on the back side already). We had to dremel 2 side prices off the harness, but it slide right now. Then we drilled through the plastics bumper cover and the metal on the bumper and bolted the bracket to the bumper.

The 4 point is just fished between the license plate and the bumper. It was easy and it now looks factory. Very happy with how it came out! Install was a cinch!


If you have multiple trailers that either use a 4-way flat or 7-pin round connector and get tried of having to use an adapter go with this setup. I've had one on my other truck for a couple years and no problems with 'em thus far. You can technically use the old existing mount on the receiver hitch itself but the 4-way will dangle unless you ziptie it up.

2002 Ford Excursion

My 2002 Ford Excursion 7.3L diesel had the original factory hitch and wiring harness. The quality and heft of the Curt T-Connector is impressive. I bet I get years of use without problems.

2016 Jeep Grand Cherokee

Love the product but the packaging could be better.

Works get excellent product
Jack - 11/03/2021

Jeep Grand Cherokee

Bought this along with the e98901 trailer hitch for our '15 Grand Cherokee. Both were a perfect fit and no modifications were needed!I was able to install in less time than advertised on the website. Really glad I bought from earlier! Price was great too!

2016 Jeep Grand Cherokee

Exactly what I needed! Fit my 2016 Jeep Grand Cherokee perfectly.


Did not fit my vehicle as stated.

2017 Nissan Titan XD

There was no place on the new hitch to bolt the end to, which was a disappointment. For now I sip tied the end to the hitch in an area where it does not move.

Show More Reviews

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

  • Will the Curt T-Connector Vehicle Wiring Harness C55774 Fit a 2018 Ram 350
    Yes, the Curt T-Connector Vehicle Wiring Harness part # C55774 is a fit for a 2018 Ram 3500. The US Car Plug on the above harness is an industry standard connector so the trailer connector will fit just fine on a Ram 3500.
    view full answer...
  • Can 7-Way and 4-Way of Curt Connector for 2014 Ram 1500 be Used at Same Time
    The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors # C55774 are able to be used at the same time but it wouldn't be any different in regards to making sure the circuits were not overloaded. I believe you were referencing a different Q&A and this part was recommended (it fits a number of different vehicles) because the individual was unable to open the covers on their 4-way and 7-way at the same time. That is not an issue you will have...
    view full answer...
  • Does Wiring Harness for 2018 Jeep Grand Cherokee Require Activating Tow Package Wiring Circuit
    If your 2018 Jeep Grand Cherokee has the factory tow package and you are using the Curt T-Connector Vehicle Wiring Harnesse # C55774 you will need to go to your local Jeep dealer and have them re-flash your Jeep's computer in order to activate the tow package wiring circuit.
    view full answer...
  • Replacement 7-Way Harness Recommendation for 2002 Ford F-250
    We have the Curt 7-way part # C55774 which is a fit for your 2002 Ford F-250 as a replacement 7-way. The harness is short and not a longer one designed to fit up to the truck bed like for a fifth wheel or gooseneck setup. I attached a review video for this harness for you to check out as well.
    view full answer...
  • Can I Use Both the 7-Way and 4-Way Connectors at the Same Time on a 2015 Chevrolet Silverado
    You can use a 7-Way and 4-Way connector at the same time just as long as you are not overloading the light circuits. If your camper has a lot of outside lights like running lights, and brake/stop/turn lights then the lights that perform the same functions on your boat trailer might be a little dim or the fuses might blow on those circuits. For a 7-Way and 4-Way connector that you can use at the same time I recommend using the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package...
    view full answer...
  • Recommended Trailer Wiring Harness For 2015 Jeep Grand Cherokee With Factory Tow Package
    If your 2015 Grand Cherokee has the factory tow package, you will have a connector at the rear of your vehicle behind the bumper. The harness I recommend is the Curt T-Connector Vehicle Wiring Harness, part # C55774. This just plugs into the round connector behind the bumper and you will then have a 4-way and a 7-way connector. Unfortunately, you will need to have the computer re-flashed to get the system up and running. I would check with a couple of dealers to make sure you are getting...
    view full answer...
  • Replacement 7-Way Harness for 2011 Ford F-250 Super Duty
    If your 2011 Ford F-250 had the factory 7-Way, it sounds like you just need the Curt T-Connector Vehicle Wiring Harness # C55774. This connector will plug directly into the OEM tow package wiring harness and also provide you with a new 7-Way and 4-Way trailer connector. I have attached the written installation instructions that you can use for reference. If you are referring to the factory harness on your truck that this would plug into, then unfortunately this is not a part that we...
    view full answer...
  • Wiring Harness for 2011 Toyota Tundra With Factory 7-Way
    The Curt T-Connector # C55774 is a confirmed fit for your 2011 Toyota Tundra with factory 7-way; you'll only need to plug it into the tow package wiring harness. I've added a link to a video review and install for you to take a look at.
    view full answer...
  • Length of Curt T-Connector Vehicle Wiring Harness # C55774
    I went out to the warehouse to take a look at the Curt T-Connector Vehicle Wiring harness # C55774 referenced in your question, which is confirmed to fit your 2006 Chevrolet Silverado. I measured a length of right at 15-3/4 inches from end to end on the wiring harness, which exceeds the length that you are needing. This will connect directly to the factory port located behind the rear bumper on your Silverado and provide you with both a 7-Way and 4-pole connector. I have attached the written...
    view full answer...
  • 4 or 7-way Wiring Harness for 2016 Chevrolet Silverado 1500
    Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55774 is a confirmed fit for your 2016 Chevrolet Silverado 1500. It quickly and easily installs a 7-way and a 4-way trailer connector on your vehicle. The connector plugs directly into OEM tow package wiring harness with no cutting, splicing or tapping required. The attached video is just a demonstration since it is on a Jeep instead of a Silverado.
    view full answer...
  • Does Curt 7-Way and 4-Way # C55774 Fit 2017 Nissan Titan SV Crew Cab
    Curt has verified that their 7-way and 4-way part # C55774 is a fit for your 2017 Nissan Titan SV crew cab. Basically it just plugs into the 7-way wiring you have at the rear of your truck and then gives you both style of connectors. The mounting bracket is designed to attach to a lower bumper or fascia though and shouldn't be attached to the hitch as that would void the hitch warranty to drill into it.
    view full answer...
  • Troubleshooting Running Light Circuit That's Not Active with Malone Trailer and Jeep Grand Cherokee
    It's not uncommon for a single trailer wiring circuit not to work but if most of the circuits are active and only one isn't it wouldn't be the issue you described of having to have a dealer turn on the tow package. If this were the case none of the trailer wiring would be active. Since we know the problem isn't on the trailer that leaves the issue being on the tow vehicle side of the wiring. A very common reason for this is a dirty or corroded connector for that circuit which can easily...
    view full answer...
  • How to Know If Vehicle Wiring Will Be Overloaded By Connected Trailer Lights
    If you were using Curt T-Connector # C55774 and wanted to make connections at both the 4-pole and 7-way at the same time you could add the current draw of the two connected trailers/devices (like a tailgate light strip) to know whether this would exceed the rating of the circuits. The online manual for your 2015 F-250 indicates multiple separate fused circuits for the various trailer light functions. Fuse 10: 40-Amp for Trailer Tow Fuse 22: 30-Amp for Trailer Brake Controller Fuse 26:...
    view full answer...
  • Trailer Wiring Recommendation For 2012 Jeep Grand Cherokee With Tow Package
    I recommend Curt T-Connector Wiring Harness part # C55774 for the 2012 Jeep Grand Cherokee with factory tow package. I recommend the Curt Wiring because it gives you a 7-way plug and a 4-pole flat so you can tow a trailer with either connector. It also comes with the bracket. The Curt wiring plugs into the factory round 7-pole connector at the rear of the Jeep. I have attached an installation video for your reference.
    view full answer...
    Image 1 for
  • Does Curt 7-Way/4-Way T-Connector Fit 1999 Ford F-150 with Factory 7-Way
    Yes, the Curt T-Connector Vehicle Wiring Harness # C55774 uses the standard US Car Connector (see attached photo) which you should have on your 1999 Ford F-150 (behind your current connector). This connector will just plug into place.
    view full answer...
    Image 1 for
  • Fuse for 12 Volt on 7-Way of 2016 Ram 3500
    I took a look at an online copy of the owner's manual for your 2016 Ram 3500 and it did not specify the 12 volt terminal for your 7-way. However, it did specify "Trailer Tow Receptacle" in Cavity F30 in the Power Distribution Center in the engine compartment which seems is the likely fuse you are looking for. I recommend checking your copy of the owner's manual to confirm.
    view full answer...
  • Can Curt 7-Way and 4-Way # C55774 Fit 2019 Chevy Silverado 2500HD
    The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55774 that you referenced is a fit for your 2019 Chevy Silverado 2500HD and would install easily by just plugging directly into the 7-way wiring that's present at the rear of the vehicle. I am not totally sure what you mean by taking the pin out of the two covers though. But this would attach to the lower portion of the rear bumper.
    view full answer...
  • Why Won't 4-Way and 7-Way Connectors Work with Trailer on a 2018 Jeep Grand Cherokee
    Sometimes after installing some aftermarket wiring the Jeep "tow package" wiring circuit will need to be activated. This can only be done at a Jeep dealer and it sounds like this is what is going on. You can verify this by checking to see how your current wiring is connected. If everything is splice in then it would bypass all of the factory wiring and I am not sure why you would be testing and getting a signal but your Jeep isn't communicating with your trailer. If the 4-Way and 7-Way...
    view full answer...
  • Recommended 7-Way Trailer Connector for 2018 Ford F-150
    For your 2018 Ford F-150 you just need the Curt T-Connector Vehicle Wiring Harness # C55774. This custom harness will plug right into the round US car connector that you mentioned under your truck to provide you with a fully-functional 7-Way connector. A great thing about this particular unit is that it will also give you a 4-Way flat connector to use with trailers that are equipped with a 4-Way. Another plus for this harness is that it is made right here in the USA. I have attached the...
    view full answer...
    Image 1 for Image 2 for
  • Could Factory 4-Way of 2003 Ford F-150 be Cut Off After Installing Curt # C55774
    The problem you could run into if you cut the factory 4-way of your 2003 Ford F-150 off when installing the part # C55774 is that the wire still would be active and could short out if you are not careful. If you went this route you'd need to tape each wire up well so that they wouldn't short. Other option would be to just leave the 4-way and tape it up and out of the way.
    view full answer...
  • Recommended 7-Way Trailer Harness for 2018 Ford F-150 without Connector
    We have exactly what you need. In order to install a 7-Way connector on your 2018 Ford F-150 you just need the Curt T-Connector Vehicle Wiring Harness # C55774. This will plug into the round US car connector that you mentioned under the truck (see attached image) and provide you with both a 7-Way and 4-Way connector.
    view full answer...
    Image 1 for
  • Troubleshooting Trailer Brakes Not Working Towing With 2018 Ram 3500
    I am happy to help you troubleshoot your braking issue. Since the trailer brakes on the trailer work properly when hooked up to another truck then your most likely experiencing a wiring issue or defective brake controller on the truck side. Most of the time there is an issue with the pins on the 7-way connector on the truck. You want to make sure the pins are free of corrosion, if there is a bit of corrosion you can sand it off with fine grit sand paper. You also want to make sure the...
    view full answer...
  • Curt T-Connector Vehicle Wiring Harness for Factory Tow Package Length
    I went to the warehouse to measure and the 4-pole pigtail part # C55774 measures about 18 inches from the back of the 7-way plug to the end of the 4-pole connector. The wiring of the 4-pole connector that sticks out of the wire loom is about 6-1/2 inches. The overall length of the wire loomed wiring from the back of the 7-way plug to the end of the connector that plugs into the vehicle's factory port is 15-3/4 inches.
    view full answer...
  • Troubleshooting No Power to Newly Installed T-Connector on 2015 Jeep Grand Cherokee
    Thank you for the purchase of the towing equipment for your 2015 Jeep Grand Cherokee. Since you aren't able to get the wiring to send power for the Curt T-Connector # C55774 and you have checked the fuses it sounds you need to take your Grand Cherokee to your nearest Jeep dealer and have them activate the tow package wiring circuit. This isn't always the case but is sometimes necessary.
    view full answer...

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