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  1. Custom Fit Vehicle Wiring
  2. GMC
  3. Sierra 1500
  4. 2014
  5. CURT
FITS 2014 GMC Sierra 1500
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
Retail:$53.16
Our Price: $32.90
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Custom Fit Vehicle Wiring
Confirmed to Fit
2014 GMC Sierra 1500

with factory 7-Way

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Call etrailer.com at 1-800-940-8924 for expert service. We are your GMC custom fit vehicle wiring experts, and offer a great price. etrailer.com carries a complete line of CURT products for your GMC Sierra 1500 2014. Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors part C55774 from CURT can be ordered online at etrailer.com. Complete custom fit vehicle wiring installation instructions and technical support.
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2014 GMC Sierra 1500 - Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

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

Quickly and easily install a 7-way and a 4-way trailer connector on your GMC Sierra 1500 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

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   (610 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.

by:

The Curt T-Connector vehicle wiring harness fit as recommended by the etrailer.com customer service representative. I wanted to be sure the electrical connector package would fit my Draw-Tite hitch, and it did. The instructions were straightforward, although there were no screws or nuts to attach the metal bracket to the hitch. I had to supply those. I believe they should have been part of the kit. The installation video on the etrailer.com site was very helpful.



by:
Chevrolet TrailBlazer

This connector worked perfectly on my '06 Chevy Trailblazer. It was very easy to swap it out with my original connector, and the addition of the 4-pole plug makes it easy to eliminate the 7 to 4 pin adapter.



by:
2007 Chevrolet Silverado Classic

Excellent fit, oversized spare tire still fit underneath (285/70r17).



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.

Etrailer Expert

Heather A.

10/26/2018

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.



by:
2010 Chevrolet Silverado

Very easy, plugged right into the uscar connector, drilled 2 holes for the bracket, done



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!!

Mike

4/13/2019

Great. No problems.



by:
2003 Mercury Mountaineer

This was supposed to be a plug in installation for my 2003 Mercury Mountaineer. No it wasn't. Completely different connector, and the wiring was 2 feet too short. Was able to use it after a bit of clipping and splicing.



by:
2006 Chevrolet Silverado

Very good, fit perfectly

Greg

4/21/2024

It has been working great, holding up well,the same as the day I purchased it. Great product

Etrailer Expert

Bud M.

5/15/2024

@Greg Great to hear. Thank you for the update.

Greg

5/15/2024

It has been great works exactly as it should



by:

Product I ordered had an inaccurate description. Contacted customer service to return they would not send return shipping label so since the return shipping would have costed more than the part I threw it in the trash and ordered the part needed from another supplier. Needless to say I will not be ordering anything again.



by:
2017 GMC Acadia Limited

Working well. Have used the four prong plug only but am glad to have the 7 way available if needed.



by:

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 etrailer.com.



by:
2017 Ford Explorer

Always accurate parts and information



by:

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!



by:
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.



by:

great product oem quality



by:

Perfect fit, works well



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.



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.



by:
2024 Ford Bronco

Great product and very helpful staff! Thank you!!



by:

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.



by:
2023 Honda Passport

Bought this because of the split 4 pin and 7 pin connectors. I’ve had so many 7 pin to 4 pin adaptors and would forget that I let my son or son in-law use it and had to buy another one when I needed it. This will stop me from the need to buy another adaptor, good for me not good for my son and son in-law when they come over to borrow the trailer. LOL, who am I kidding I’ll still go with them to the store and buy another one.



by:

The actual trailer hitch was fine but the wiring kit was not the right kind. When I called to get a return authorization I was told that more than one half the cost of wiring kit will be deducted from my return for postage. I have never had to pay for returns to any company before. I will not be recommending your company



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.



by:
2007 Ford F-150

Great product & customer service



by:

Great fitment. Had a little difficulty getting to the right version of this but the amazing customer service at ETrailer helped me get to the correct one. Thank y’all! I love any business that’s not named after a rain forrest!


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Show More Reviews

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

  • Availability of a Replacement 7-Way and 4-Way Trailer Connector for a 2008 Ford F-250 Super Duty
    There are a couple of options for 7-Way and 4-Way connectors that you can use for a 2008 Ford F-250 Super Duty. First, you could use # 30955 that you have referenced. It fits 1997 to current Ford full size trucks. You can also use Replacement Multi-Tow 7-Way and 4 Pole Trailer Connector, # C55774. Both of these connectors come with a mounting bracket so they will not fit in the exact same place as the original 7-Way, but they will plug in to the factory wiring harness.
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    If it was my vehicle I would go with the factory tow package 7-way and 4-way wiring kit part # C55774 that you referenced since you have the connector present for it already. There's a good chance the wiring is already active too but at worst a trip to a dealer to have them reflash the computer would be super easy as well. The T-one style kits aren't terrible but if you have the wiring already present the route mentioned would be super easy and gives you both styles of trailer wiring.
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  • Replacement 7-Way Trailer Connector for 2015 Ford F-150
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  • Pigtail Length Of Curt T-Connector Vehicle Wiring Harness for Factory Tow Package
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  • 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 from the...
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  • Trailer Wiring Harness Recommendation for 2020 Jeep Grand Cherokee with Factory Tow Package
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  • 7-Way/4-Way Trailer Wiring Connector for 2011 Honda Pilot
    I have a way to install a 4-way and 7-way on your 2011 Honda Pilot but you'll need to first start with the 7-way kit part # 118253 which you mentioned. This gives you a standard 7-way wiring but then you'd need to replace the 7-way socket with a Hopkins part # 30955 and you have the combined 4-way and 7-way you are looking for.
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    If the fuses aren't blown, there could be some corrosion in the trailer connector on the truck preventing the signal from getting through. If you can see green or white corrosion on the pins, there's a chance the corrosion has spread to the interior of the connector and damaging it. Try testing the wires feeding the connector itself to ensure that power is reaching the connector when the turn signals are activated, which would confirm or rule out the connector as being the problem. If power...
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  • Brake Controller for 2002 Chevy Silverado Not Getting Power
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  • Recommended Trailer Hitch Receiver and Wiring for 2005 GMC Sierra 3500
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