1. Custom Fit Vehicle Wiring
  2. Curt
  3. Custom Fit
  4. Trailer Hitch Wiring
  5. 4 Flat
  6. 7 Blade
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

lowest price pledge
Retail:$43.93
Our Price: $23.53
You Save: 46%
Custom Fit Vehicle Wiring

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Orders above $99 qualify for Free Shipping
Shipping Weight: 1.28 lbs
Quantity: 
In Stock
C55774 - 4 Flat,7 Blade Curt Trailer Hitch Wiring
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

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. Call 800-298-8924 to order Curt custom fit vehicle wiring part number C55774 or order online at etrailer.com. Free expert support on all Curt products. Guaranteed Lowest Price 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.
  • All Info
  • Reviews (280)
  • Q & A (264)
  • Photos
  • Why etrailer?

Curt Custom Fit Vehicle Wiring

  • Custom Fit
  • Trailer Hitch Wiring
  • Curt
  • 4 Flat
  • 7 Blade
  • No Converter

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.


Features:

  • 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


Installation

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

Item # C55774

Installation Details C55774 Installation instructions

This Product Fits The Following Vehicles



California residents: click here



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   (279 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.

- C55774
by:
2002 Chevrolet Suburban

I like the way it fit up on my vehicle took some work to get receptacle mounted but worked out great 495988



- C55774
by:

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. 456039



- C55774
by:

This fit into the factory opening on the bumper perfectly however I chose not to use the 4 pin and just taped it up on the main wire and decided to go with an adapter when I need to tow a 4 in set up . It was easy to install and looks great . 458839



- C55774
by:
2011 Dodge Ram Pickup

The only reason I won't give 5 stars is because it says it would fit my truck so I assumed it would go into the factory hole in bumper and it doesn't also no hardware comes for mounting the bracket but it does come with hardware to mount harness to bracket just not bracket to truck but the harness plugged right in there was plenty of wire so place bracket where I wanted shipping was fast and I believe etrailers is great with customer service if you had questions or maybe ordered wrong part or just to help make sure you are ordering the right part 460040



- C55774
by:
2018 Nissan Titan

Great product. Slightly short for a Nissan Titan 2018 since the 7 way plug is on the passenger side. Very easy to install and fast delivery I love etrailer. Fast reliable products and services. 637312



- C55774
by:

Great products,pricing and delivery!!! 451767



- C55774
by:
2012 Chevrolet Avalanche

Got this to replace a damaged OEM connector on 2012 Avalanche. The replacement was plug-and-play, almost. The mounting bracket included with the kit was not used. I drilled appropriate holes through the OEM bracket and installed the new connector. Just disconnect the old connector and re-connect the new. Simple job. Connectors fit OEM harness. 612659



- C55774
by:
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. 577673


Comments
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.
-- Heather A - 10/26/2018

45090

- C55774
by:

Great everything was awesome 559206



- C55774
by:
2004 Cadillac Escalade

Product just like it said it does, delivery just took long but is free delivery so is good, packed box came like bit out from the people delivered but localy everything works good 430179



- C55774
by:
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. 398239



- C55774
by:

Hitch does what it needs to do. Finish is ok. Starting some rust even though we live in upstate SC. I coated with Fluid Film to try to keep it nice. I ordered the wiring to and plugged into factory harness. No lights worked. Started reading online elsewhere that it had to be flashed at dealership to unlock that feature. Dealership looked at me funny and never got a straight answer. 546305



- C55774
by:
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!! 495215


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

52876

- C55774
by:

What you need to be aware if you're buying this product, which the page doesn't make clear, is that you cannot use it without also taking your car to a dealership to get the codes changes in the computer so that the existing wiring hook-up works. As a result, I have no idea if the harness I've installed, which was admittedly very easy to install (though it comes without two key screws) works until I can get it in to the Jeep dealership and pay the hour labor rate 938546



- C55774
by:
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. 936548



- C55774
by:

Really fast shipping. 5 stars all the w ay... 934248



- C55774
by: 01/04/2021

PERFECT FIT! I stress about online purchases- This product was a perfect fit and it came with all the parts (WORKING PARTS). I didn't have to worry about getting something extra, replacing something, modifying items.. Customer service was great. Shipped quicker than I anticipated. Couldn't have had a better experience or been more satisfied! 933382



- C55774
by:

Easy install!! Everything fit and worked perfectly. Strongly recommend your products and services!!! 932189



- C55774
by:

Quick delivery great service. Will definitely buy from again. 928726



- C55774
by:
2012 Buick Enclave

It was great ordering everything from you. Even though I had the wrong wiring you got the right one sent out right away. I’m very satisfied with your service 923970



- C55774
by:

Easy peasy install! 922051



- C55774
by:
2013 Chevrolet Silverado

once again etrailer has come thru. the 7 way connector will work just fine for what i am doing, thank you 921899



- C55774
by:
2002 Ford F-150

My existing wiring harness got jacked up and this "plug-n-play" harness made it easy to replace the old one. 918761



- C55774
by:

917731



- C55774
by: 11/28/2020

William B was very helpfull and took the time to insure i received the right part,also shipping was fast.very good in all ways. 916936


26
282
Show More Reviews

Ask the Experts about this Curt Custom Fit Vehicle Wiring

  • How to Easily Install 7-Way on 2018 Ford F-150 that Has 4-Way
    The wires are ran to the rear of your 2018 Ford F-150 that you'll need to wire up a 7-way but they stop at a connector that's in the frame rail of the truck. So the adapter you need is the part # 37185 which your 4-way will plug into and then depending on what 7-way functions you need will determine how much of the truck's wiring in the truck frame you'll need to access. The blue wire of the adapter would need to run to the blue wire pointed out in the harness if you have a brake...
    view full answer...
  • 2018 Audi Q7 Brake Controller Installation
    If the Q7 has a factory 7-way socket you can simply plug in the Curt Echo brake controller # C51180, pair it to your smart phone and you're done. The Echo installs in your trailer connector so there is no bulky box to get in your way inside the car. Please check out the included video. But if you have no wiring you'll need to install a basic 4-pole harness and an upgrade kit to convert that wiring to the 7-way format required for the Curt Echo. Available 4-Pole kits include both a...
    view full answer...
  • Fixing Factory Trailer Wiring On 2004 Nissan Titan That Has Been Cut Off
    Depending on how far they cut back at the factory tow package, you may be able to just a 7-Way plug like part # C55774. If they just cut off the 7-way plug but not the OEM connector port under the bumper this will work. I have attached a photo of what you will need to look for. You did say that your truck came with a factory wiring harness but if you do not have the two relays behind the panel on your dash board to the left of your steering wheel then you will need to add those with part...
    view full answer...
  • Parts Needed to Install 7-Way on 2020 Ford Transit T250
    The Curt 7-Way part # C55774 that you referenced is a fit for your 2020 Ford Transit T250 IF it has the factory tow package and the round connector for a 7-way present at the rear of the vehicle. It's possible you don't have the factory tow package and the connector you are looking for just isn't there. I attached a picture of what the connector you'd need looks like. If instead you don't have the factory 7-way connector you'd just need the # 22114 and you'd be set! I attached an install...
    view full answer...
  • Aftermarket Hitch Recommendation and Capacity for 2015 Chevy Silverado 2500 HD
    When it comes to towing components like hitches, you're always going to be limited to the capacity of your lowest rated components; so adding a higher rated hitch to your vehicle isn't going to increase your towing capacity or the payload. From what I was able to determine with my research, the towing capacity of your 2015 Chevy Silverado 2500 HD with a 6.0L engine is 13000-lbs and the payload capacity is going to be somewhere between 3000-lbs and 3500-lbs depending on your trim package....
    view full answer...
  • How to Extend Trailer Connector to Mount on Aftermarket Bumper
    I do have a solution to extend your 7 way to reach your new bumper, the Tow Ready Replacement 7 way Harness and Socket part # 20147. It provides you with an additional 17" of wire, and a US car connector to plug into the back of the seven way connector. You will cut the existing connector off your truck, and crimp the new harness on with the included butt connectors, then plug the connector into the back of the plug. If you need a new socket also, I recommend the 7-Pole and 4-Pole Trailer...
    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...
  • Recommended Trailer Wiring Harness for 2015 Ford Transit T250
    The easiest way to determine if you have a factory tow package is to call a dealership with your VIN and they can tell you. If you are willing to get under your vehicle, the factory wiring harness if there is one will be a round harness near the bumper. The factory connection was normally connected to the 7-way, so if you don't have the 7-way it is likely you don't have the factory tow package. If you have the 7-way, you can use the Curt # C55774. If you don't have the factory harness,...
    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...
    view full answer...
  • Does the Curt T-Connector Vehicle Wiring Harness for a 2012 Buick Enclave Come With Fuses
    The Curt T-Connector Vehicle Wiring Harness for Factory Tow Package part # C55774 is a fit for a 2012 Buick Enclave with factory tow package. Therefore, the fuses and relays should already be present. If you don't have the factory tow package then you may need to supply your own fuses and relays as they are not provided.
    view full answer...
  • Parts Needed to Add 7 Way Connector to 2013 Ford F-150 XL
    It sounds like you may already have the factory towing package wiring present, so to install a 7 way connector on your 2013 Ford F-150 XL you can use the Curt # C55774, which will plug into the same port your 4 way is plugged into. I do recommend checking to make sure that you've got a round, US Car connector port there that your 4 way is plugged into to determine if this will be compatible. If you don't have that connector it means that your 4 way was added after purchase. If that's...
    view full answer...
  • Replacement 7-Way Connector for 2006 Ford F-350 Super Duty
    We do have replacement 7-way connectors for your 2006 Ford F-350 Super Duty, though I'm not 100 percent certain what are are referring to in terms of also wanting a pigtail. What I recommend is replacing your 7-way with the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors # C55774. This will plug into your tow package harness and give you a brand new 7-way with the ability to also plug in a 4-way if needed. Since you mentioned having...
    view full answer...
  • Recommended 7-Way and 4-Way Trailer Wiring Connector Compatible with Factory Harness
    For your 2002 Ford F-250, the wiring harness you are seeking with both 7-way and 4-way connectors is the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors # C55774 or the Reese # 74682. Either of these will connect to your factory wiring harness to give you both of the trailer connectors you seek.
    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...
  • 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...
  • 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...
  • Length Of Curt Vehicle Wiring C55774 For 2018 Nissan Titan With Factory Port On Passenger Side
    It sounds like you are trying to make sure you can use the existing bracket mount on your hitch to mount the Curt T-Connector part # C55774 on your 2018 Nissan Titan with factory 7-way port. The wiring portion of the Curt T-Connector measures 15-3/4" long so you may want to measure from the factory 7-way port to the mounting bracket on your hitch to see if you have enough length. The other options would be Gooseneck wiring options and the shortest one available is 7 feet long which is way...
    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...
  • 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...
  • Adding a Clean-Looking 4-Pole to the Factory 7-way on a 2012 Chevrolet Silverado
    I called Curt to confirm, and the T-Connector, part # C55774 will not fit in the factory hole in your 2012 Chevrolet Silverado's bumper. If you're looking to replace the factory 7-way plug, then the Pollak Replacement 7-Pole, part # PK11893, will fit in the factory hole. I've linked to a video review of this socket for you to look at. If you're looking to add a 4-pole to your factory towing package and still keep a relatively clean, factory look, I recommend a different T-Connector...
    view full answer...
  • Parts Needed to Change 4-Way on 2012 Nissan Pathfinder to 7-Way for Trailer
    I do have a solution for you, but the Curt T-Connector # C55774 that you referenced is not a confirmed fit for your 2012 Nissan Pathfinder. If you just need the light functions to work on your trailer then what you will want to use is the Hopkins Adapter # 37185 which will convert your 4-Way to a 4-Way and 7-Way. If you are needing to utilize brakes on your trailer, which is common when they have a 7-Way, you will instead want to install the Tekonsha T-One # 118266. The black plug...
    view full answer...
  • Parts Needed to Add 4-Way to Motorhome that has 7-Way at Rear of it
    If your 7-way has a round connector at the back that you could remove you could use the part # C55774 as a replacement for it and you'd have a 4-way separately that you could use for your magnetic lights. Or if you have a 7-way that does not have a connector behind it you could hardwire in one with the # 18252.
    view full answer...
  • Recommended 7-Way Trailer Wiring Harness For 2011 Ford Ranger With Factory 4-Way
    If you have a 7-way trailer connector on your trailer then it probably has brakes and you will need a brake controller in your 2011 Ranger. We have everything you need to get this done. First, you will need part # ETBC7. This will plug into your 4-way and with additional wiring will give you a working 4-way and 7-way trailer connector. For a brake controller I recommend the Prodigy P2, part # 90885. This is our most popular because it is easy to install and operate. I have attached...
    view full answer...
  • How to Install a 7-Way on a 2018 Ram 1500 Without Tow Package
    The first thing you are going to want to do is check under the rear bumper near the spare tire for a wiring plug called a US Car Connector which you can see a photo of attached for you. If you have this plug then all you will need to install both 4 and 7-way trailer connection points on your Ram is the Curt T-Connector Vehicle Wiring Harness part # C55774. If you do not have this wiring plug then you will need to hardwire both wiring harnesses into the vehicle's tail lights. In order...
    view full answer...
  • 7-Way Wiring Harness for 2002 Ford F-350 Super Duty with Square Connector
    It sounds like your truck will use a 7-way harness like Hopkins # 40167 which uses connectors like what you describe. Please refer to the linked photo that shows those connectors. This includes a 7-way socket that plugs into the included round U.S. Car connector on the other end of the 10-foot harness.
    view full answer...




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality custom fit vehicle wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate custom fit vehicle wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Video by:
Andrew K
Video by:
Joshua S
Video by:
Michael B
Written by:
Lindsey S
Installed by:
Jeff D
Video Edited:
Jacob T
Video Edited:
Chris R
Updated by:
Sarah W
Updated by:
Kristina F
Updated by:
Isabelle B
Test Fit:
Brent H
Test Fit:
Shane H
Test Fit:
David F

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.