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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
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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. 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.
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Curt Custom Fit Vehicle Wiring - C55774

  • 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

Installation Details C55774 Installation instructions

This Product Fits The Following Vehicles



California residents: click here


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

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 - C55774 Review


Customer Reviews

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors - C55774

Average Customer Rating:  4.6 out of 5 stars   (150 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:
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:
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:

Great everything was awesome 559206



- C55774
by:

Great products,pricing and delivery!!! 451767



- 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:

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:
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:

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:
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:
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:
2016 Jeep Grand Cherokee

Got all the parts put together and took Vehicle to Jeep Dealer to have the computer updated. All is good thanks to etrailer and videos provided on you web site. Thanks to you and person who referred me to your web site. 404216



- 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:
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:
2003 Jeep Grand Cherokee

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package. Pros... Product was as advertised. Seems to be good quality. Installation, fit, and function are good so far. Cons... It should be stated in the product info that after the Wiring Harness connector is installed, the car's factory tow wire harness option will have to be activated by the dealer . This was an additional $125. for my Jeep Grand Cherokee. 409017



- C55774
by:
1997 Chevrolet C/K Series Pickup

I ordered the part that your website said would fit my 2004F 250 super duty. It is the wrong plug that I was given 640932


Comments
This plug is designed as a replacement 7-way connector on F250 models that were factory equipped with the 7-way. The existing connector should be unplugged at the rear where it connects to the vehicle wiring harness, then replaced with this part.
-- Mike L - 05/15/2019

55298

- C55774
by:
2005 GMC Sierra

Amazing!! So I bought an 05 GMC Sierra 1/2 ton that had the tow mode on the shift lever, but no wiring for towing. I started youtubing how to get tow wiring installed and found out that the factory wire was indeed near the rear bumper, capped and located just above the spare tire which made it hard to see until you knew where to look. Once you remove it from the bed frame, there is enough wire to reach down to the bumper. You then connect round connector to round receiver and it all works. My hitch receiver already had a strong mounting plate that this harness fit into, so it was just a matter of drill the 4 holes and attaching with the provided nuts and bolts. This is an extremely well made harness that is worth the price and it also arrived within a few days of order. 593800



- C55774
by:
2016 Jeep Grand Cherokee

The custom hitch for the 2016 Jeep Grand Cherokee fit extremely well and it was just like the online video on your site. The wiring Harness worked out very easily and I mounted the bracket to the subpanel under the bumper area but above the hitch so it did not stick down low- Looks great. The test unit worked extremely well also. I was very pleased with everything from the call I made to the representative to his follow-up e-mail and with the useful and helpful videos on your site. Vey pleased 3rd time I have ordered from this site and have been extremely pleased every time. 376725



- C55774
by:
2002 Chevrolet Tahoe

Exactly what i needed and was extremely easy to install 522899



- C55774
by:

This is a good product, but it was not plug and play for my make and model of vehicle. I had to have a plug wired into my vehicle before I was able to use this product. 633784


Comments
This wiring harness would only be a fit for your 2001 Silverado if it was equipped with the factory 7-way trailer connector.
-- Mike L - 04/23/2019

54338

- C55774
by:
2018 Jeep Grand Cherokee

Came as expected can’t really review yet waiting for the time to install! Sucks they didn’t send the bracket hardware with this unit 521799


Comments
The Curt 7-way trailer connector # C55774 provides the hardware to attach the connector to the mounting bracket, but not the bolts used to fasten the bracket to the vehicle. Curt chose not to provide that hardware because the hardware needed would depend greatly upon the surface the connector is mounted to.
-- Mike L - 06/15/2018

39802

- C55774
by:
2008 Ford F-250 and F-350 Super Duty

Great products and customer service. Will use them again 475531



- 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:

This is such an awesome product, I'm so happy I came across your website when searching for a replacement! What an upgrade to what I had. Thanks so much!!! 398717



- C55774
by:
Nissan Titan

The product is well made but here's the problem. It's too short to mount on the Drawtite hitch bracket when used on a Nissan Titan.. the only option i could find was to order an extension that required me to cut off the factory plug and splice it to the factory wiring which I did not want to do. the solution I came up with was to cut the wiring on the harness and splice in some wire of the same gauge. why not come up with a plug n play extension male on one end and female on the other about one foot long. 613367



- C55774
by:

Just what I needed, delivered on-time, at a reasonable price 754822


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Show More Reviews

Ask the Experts about this Curt Custom Fit Vehicle Wiring

  • 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...
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  • 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.
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  • 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.
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  • Trailer Wiring Recommendation For 2017 Jeep Grand Cherokee
    The Pollak 7-Way part # HM40975-11933 is a fit for your 2017 Jeep Grand Cherokee and would plug into a square connector at the rear of the vehicle. Most likely it's the connector you found already based on what you described. You might test the pins of the connector you found with a circuit tester like part # PTW2993. If they are active when vehicle taillight signals are on then this will work. If instead you do not have the tow package wiring complete the T-one kit part # 118727 would...
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  • Recommended Trailer Wiring Harness for a 2017 Nissan Armada
    In order to add a trailer wiring harness to your 2017 Nissan Armada, I recommend using the Curt T-Connector Vehicle Wiring Harness part # C55774. This is a plug and play option that will provide you with both 4 and 7-way trailer connection points in addition to a mounting bracket. I called my contact at Curt to confirm this. If you don't already have a bracket on your hitch to mount the trailer connector bracket to then you can use part # 18140.
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  • 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...
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  • 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...
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  • Recommended Wiring Harness with 7-Way and 4-Pole Flat Connectors for 2016 Ford Explorer
    For your 2016 Ford Explorer, I recommend using the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55774. You can use this to quickly and easily install both a 7-way and 4-way trailer connector on your Explorer. The connector will plug directly into your OEM tow package wiring harness so no cutting or splicing will be required. This harness also includes a mounting bracket and hardware. For a no-drill mounting bracket application, you can add the Tow Ready Bracket # 18140....
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  • Pigtail Length Of Curt T-Connector Vehicle Wiring Harness for Factory Tow Package
    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-way connector adapter piece so you shouldn't have any issues plugging in your 4-way. 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...
  • 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...
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  • 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...
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  • Recommended Trailer Wiring Harness and Other Parts to Tow a Trailer With a 2017 Audi Q7
    It sounds like you're looking for a trailer wiring harness for your 2017 Audi Q7. If the Audi came with the factory tow package but doesn't have the connector you can use the Curt # C55774 which will provide you with a 4-way and 7-way connector. This harness plugs into the tow package wiring harness which will be under the rear of the vehicle. If you don't have the tow package I recommend the ZCI Harness # 119250KIT. This installs by clamping to the Audi's existing wiring without...
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  • 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...
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  • 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...
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  • Recommended Wiring for 2016 Ford F-150 to Have 7-Way Trailer Connector
    If you already have the round wiring connector on your 2016 Ford F-150, then you simply need the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors # C55774. If you do not have the round connector and instead have the rectangular connector, then you will need the Replacement OEM Wiring Harness for Ford F-150 # C56110 to give you a 4-way and then add the 7-way wiring kit for brake controller # ETBC7 and connect the brake wire to the blue wire...
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  • 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.
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  • 7-Way Recommendation for 2005 Ford F-150 with 4-Way
    If your trailer does not have brakes all you would need is the part # 37185 as an adapter to convert the 4-way to a 7-way. If you do have trailer brakes you would need the # 3035-P, the # 37185, and a brake controller. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup.
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  • 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...
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  • 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...
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  • 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.
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  • 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...
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  • Recommended 7-Way Connector for 2011 Ford F-150 Raptor
    It sounds like you are needing a 7-Way connector on your 2011 Ford F-150 Raptor. For this, I recommend the Curt T-Connector Vehicle Wiring Harness # C55774. This will plug right into the factory port on the truck, which is what appears you have found behind the rear bumper. Once the connection is made, you will have a fully functional 7-Way and 4-Way connector on your F-150. I have attached an installation video that you can check out. It is on a different vehicle, but you can watch...
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  • Trailer Wiring Harness to Add 7-Way 2001 Ford Excursion Limited with Factory Tow Package
    The Curt Vehicle Wiring Harness # C55774 is confirmed to fit your 2001 Ford Excursion as long as you have the factory tow package. If you do not have the tow package you can add a 4-way with The Tekonsha # 118344 and then add the 7-way using # ETBC7.
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  • 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.
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  • 5th Wheel 7-Way Recommendation for 1999 Ford F-250
    If you are looking for 5th wheel trailer wiring that fits your 1999 Ford F-250 and uses a square trailer wiring connector you'd want the Draw Tite part # 20031 which is a confirmed fit. This has the square connector that Ford trucks of your generation would have. The Curt part # C55774 you mentioned also fits but it would tie into the current 7-way by installing inline with it using the round connector found right behind the 7-way at the bumper.
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  • Recommended 7-Way Connector For 2020 Jeep Grand Cherokee
    I recommend the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package part # C55774 for the 2020 Jeep Grand Cherokee with factory tow package. The Curt trailer connector will plug into the factory tow package on the back of the Jeep. This plug also gives you a place to plug in a 4-way trailer connector as well. I have attached an installation video for your reference.
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  • Brake Controller Recommendation for 2015 Ford Transit T350
    If you have the round connector at the rear of your 2015 Ford Transit for trailer wiring you'd only need the part # C55774 to add a 7-way and then you'd be able to install a brake controller but you will still need to do some wiring as there isn't a port under your dash for a quick install harness. For a brake controller I would recommend the Prodigy P3 Brake Controller part # 90195. This is our best selling brake controller because of how well it works and how easy it is to setup. This...
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  • Needing a 7-Way Trailer Connector for a 2011 Jeep grand Cherokee With Tow Package
    We have a 7-way connector that will fit your 2011 Jeep Grand Cherokee. Since you have the 4-way flat connector already installed with the factory tow package, you will probably be able in install a 7-way connector like the Curt T-Connector Vehicle Wiring Harness, # C55774. The Curt connector uses the larger round OEM plug that will connect to the plug that is located behind the rear bumper on the drive's side. You will also connect your currant 4-way flat plug to the Curt connector....
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Do you have a question about this Custom Fit Vehicle Wiring?




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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
Test Fit:
Brent H
Test Fit:
Shane H
Test Fit:
David F
Updated by:
Kristina F
Updated by:
Isabelle B

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