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  1. Custom Fit Vehicle Wiring
  2. GMC
  3. Sierra 1500
  4. 2021
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FITS 2021 GMC Sierra 1500
Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector and Cover Plate - 7' Long

Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector and Cover Plate - 7' Long

Item # C53CR
Retail:$127.95
Our Price: $72.95
You Save: 43%
Custom Fit Vehicle Wiring
Confirmed to Fit
2021 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 2021. Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector and Cover Plate - 7' Long part C53CR from CURT can be ordered online at etrailer.com. Complete custom fit vehicle wiring installation instructions and technical support.
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2021 GMC Sierra 1500 - Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector and Cover Plate - 7' Long

  • 7 Round - Blade
  • Fifth Wheel and Gooseneck Wiring
  • CURT

Mount this 7-way, RV-style connector in your truck bed for quick hookup of your 5th-wheel or gooseneck trailer. Harness plugs in-line with your existing factory wiring so that you can retain use of your GMC Sierra 1500's 7-pole. Includes cover plate.


Features:

  • Provides 7-way, blade-style connector in your truck bed for hassle-free hookup of 5th-wheel and gooseneck trailers
    • Connector mounts in truck-bed sidewall, tailgate post or wheel well
  • Retains factory 7-pole trailer connector at rear of truck (if present)
  • Plugs into factory wiring - no cutting or splicing
    • 7' Long, insulated wiring harness reaches from rear bumper to truck bed
    • Requires that truck have factory tow package
  • Custom fit for your vehicle
  • Includes cover plate
    • Adapts Curt 7-way sockets to fit factory GM truck bed connector opening
    • Covers gaps to provide a clean, factory look in the truck bed
  • Includes zip-ties and self-tapping screws for installation


Specs:

  • Harness length: 7'
  • Limited 1-year warranty


55417 Curt 7-Way Opening Cover Plate for Chevrolet and GMC Truck Bed

56070 Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector - 7' Long

Installation Details C53CR Installation instructions

Customer Satisfaction Score:


Customer Reviews

Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector and Cover Plate - 7' Long - C53CR

Average Customer Rating:  4.7 out of 5 stars   (110 Customer Reviews)

Mount this 7-way, RV-style connector in your truck bed for quick hookup of your 5th-wheel or gooseneck trailer. Harness plugs in-line with your existing factory wiring so that you can retain use of your vehicle's 7-pole. Includes cover plate.

by:
2022 Chevrolet Silverado 2500

The wiring harness was super easy to install. The instructions are easy to understand. I highly recommend this to anyone wanting to add a 7-Pole trailer connection to the inside of their bed.



by:
2022 GMC Sierra 2500

Great Product!! Dealer wanted $200 to $300....Watched the accompanying video, and Installation was pretty straight forward on My 2022 GMC 2500HD. The only pain was getting at the Factory connection clip on the original plug... I chock that up to being my own fault for not dropping the spare tire down for ease of access...



by:

Ordered this for a 2024 Silverado 2500HD even though it wasnt certain that it would be compatible. Once i figured the connections out the actual install took maybe 15 minutes! Ill add i coated all the connection pins with dielectric grease before reconnection. Worked perfectly.



by:

I liked this kit. It looks and feels like high quality. Installation was easy and it took very little time to get clean results. Etrailer was great to work with. I talked with Kim on the phone due to some questions that I had after I received my order. The call was professional and helpful. I would order from etrailer again.



by:
2022 Chevrolet Silverado 2500

Easy to install. Looks great.



by:
2020 GMC Sierra 2500

Excellent Installation and Timely Deliv ery!



by:

This product was exactly what I needed and has worked flawlessly for me for a year. Highly recommend it!



by:
2022 Chevrolet Silverado 2500

I was mad when I saw this, paid $200 to have installed in my previous truck’s bed. When I watched the video and saw it was plug and play I ordered and installed my self in less than 30 minutes. Shipping took a week but I won’t need it until the 3rd week of August when I head out with the fifth wheel. Product came as advertised with every thing needed to install. It looks factory (see pic). I am very happy with how it came out and the installation video was excellent.



by:
2023 GMC Sierra 2500

Easy installation.



by:
2020 GMC Sierra 2500

Product was easy to install and works great. There was some conflicting shipping information that I was receiving. All in all, it worked out ok.



by:

Amazing!! Fast delivery and no issued with items ordered. E- trailer is a great company!



by:
2024 Chevrolet Silverado 2500

Went together very simple and easy plugged it in and works



by:
2020 GMC Sierra 2500

Exactly what needed and ordered. Fast shipping. Thank you!



by:

Arrived the next day and I only selected basic shipping. This is the only company that seems to have what they sell in stock and ships quickly. Also if you have a problem they bend over backwards to make it right.



by:
2023 Chevrolet Silverado 1500

Excellent product.



by:

This was probably one of the fastest items to install on everything I have added to my 21 GMC Sierra 2500HD, Denali Duramax. The right angle plugs make it simply slip in, plug and play.



by:

It was simple to install and worked great for a 12k mile summer trip.



by:

Was perfect for what I needed.



by:
2023 GMC Sierra 3500

Worked with Neil on a GMC 2024. U known if adaptable with new GMC. Built my confidence as we spoke. Anyway, it did fit and works great with camper and boat. Made my own face plate to use the dummy hole on the driver's side. Extended my RV cord to fit. No holes drilled in bed. Would of worked better with the GMC factory fit plug but not the case. Excellent. It does work with the 2024 GMC.



by:
2021 GMC Sierra 2500

I love the setup but I have a concern that the connection in the bed once installed has a slight right angle into a sharp bed seam. It is at the spot right at the connector with no cable armor. I am concerned this will wear and cause a short down the line.

Etrailer Expert

Katrina B.

2/21/2023

I would need to see your set up that you have under the vehicle. Can you please send me a picture of what you are concerned about?



by:
2023 Chevrolet Silverado 2500

Good instructions and simple to install.



by:

Just what I was needing for my 2022 Silverado 3500 HD. Worked perfect. Great accompanying videos to help with installation



by:
2024 Chevrolet Silverado 1500

Fast delivery. Haven’t installed it yet



by:
2024 Chevrolet Silverado 2500

worked very well



by:
2020 Chevrolet Silverado 2500

Outstanding!


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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
Video by:
Joshua S
Employee Jonathan Y
Video by:
Jonathan Y
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
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Dustin K
Employee Chris R
Video Edited:
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Employee Wilson B
Updated by:
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Employee Kristina F
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