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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/ 4-Way and 7-Pole Connector - 7' Long

Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 4-Way and 7-Pole Connector - 7' Long

Item # C58FV
Retail:$126.95
Our Price: $97.29
You Save: 23%
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/ 4-Way and 7-Pole Connector - 7' Long part C58FV from CURT can be ordered online at etrailer.com. Complete custom fit vehicle wiring installation instructions and technical support.
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  • Reviews (16)
  • Q & A (0)
  • Videos (1)
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2021 GMC Sierra 1500 - Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 4-Way and 7-Pole Connector - 7' Long

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

Mount this 4-way and 7-way, RV-style connector in your truck bed for quick, simple hookup of your 5th-wheel or gooseneck trailer. Custom harness plugs in-line with your existing factory wiring so that you can retain use of your GMC Sierra 1500's 7-pole.


Features:

  • Provides 4-way and 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 zip-ties and self-tapping screws for installation


Specs:

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


56003 CURT Fifth Wheel and Gooseneck OEM Extension Harness - 4-Way Flat - 7-Way RV Blade Plug - 7' Long

Installation Details C58FV Installation instructions

Video of Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 4-Way and 7-Pole Connector - 7' Long

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of CURT Custom Fit Vehicle Wiring - Fifth Wheel and Gooseneck Wiring - C58FV

Hi there, I'm Michael with etrailer.com. Today we're gonna take a quick look at this CURT 5th Wheel and Gooseneck custom wiring harness. This is gonna provide a 4-way and a 7-way blade style connector in your truck bed so that you can very easily hook up your 5th wheel and gooseneck trailer and not have to worry about the hassle of trying to reach down to the connection point that's down by your bumper. And this is going to mount in your truck bed sidewall tailgate post or wheel well and it is going to be a custom fit for your 2019 and newer GMC Sierra and Chevrolet Silverado 1500, 2500, and 3500 with a factory 7-way. So this will plug right into your factory wiring. You're not gonna have to do any cutting or splicing into the wiring.

Basically, you'll just take your connector off. It's going to expose this kind of connection here that's currently on your vehicle. You'll then plug that portion into this and then reconnect your plug here. So that's going to re-complete that circuit. So your bumper mounted 7-way is still going to be working just fine, just like it originally did.

And then that's also going to then send your signal up to your truck bed. This is seven feet long and it is going to reach up to the truck bed so that you can more easily connect your 5th wheel and gooseneck. Make sure that you've got all the wiring that you need there. They do include instructions for you to get this installed. They walk you through that installation process even though it's very simple and they give you all the pictures that you need as well as some zip ties and to hold your wiring even place where you need it.

So very easy way to kind of extend your wiring harness or your wiring connector up into your truck bed so that you'll have much easier time hooking up when it's time to tow. So that completes our look for today. Again, I'm Michael with etrailer.com. Thanks for watching.

Customer Satisfaction Score:


Customer Reviews

Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 4-Way and 7-Pole Connector - 7' Long - C58FV

Average Customer Rating:  4.7 out of 5 stars   (15 Customer Reviews)

Mount this 4-way and 7-way, RV-style connector in your truck bed for quick, simple hookup of your 5th-wheel or gooseneck trailer. Custom harness plugs in-line with your existing factory wiring so that you can retain use of your vehicle's 7-pole.

by:

Super easy to install. The hardest part was pulling the old plug from the harness to the bumper connector. Although the instructions said to feed the bed connector from the bottom it was easier to feed the bed connectors (even though there were two) into the upper bed slot and then under the bed.



by:
2024 Chevrolet Silverado 3500

Solid harness but it’s sold as a direct fit for my truck and the way the harness is routed does not allow it to work on my truck. The connection to the outlet routes directly into the steel frame support of the box of my truck.



by:

Stacey A. was very helpful and guided us towards the replacement product that we needed. Excellent customer service on her part.



by:

Have not had time to install it yet but looks correct and as described. Product was delivered 1 day ahead of Est delivery date.



by:
2023 Chevrolet Silverado 1500

Easy to install, clean look after installed and quality product.



by:

This fit as advertised and works great.



by:
2023 Chevrolet Silverado 3500

Dropped right in spent more time unboxing and removing the taillight than the install itself.



by:

Great



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2017 Chevrolet Silverado 2500



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2024 Chevrolet Silverado 2500


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

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    Congrats on the new truck! To add a gooseneck hitch to your 2024 GMC Sierra 2500 with a standard bed, I recommend the B&W Custom Underbed Installation Kit item # BWGNRK1020. It has a massive 30,000 lbs capacity and fits both the 6-3/4' and 8' bed lengths. The B&W item # BWGNRK1020 includes all hardware necessary to complete installation on your truck. The custom fit brackets install into preexisting holes in your trucks frame. It is made in the USA and powder coated to prevent rust. This...
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  • How to Use a Demco AutoSlider 5th Wheel Hitch in a 2024 Chevy Silverado 2500 w/out the Puck System
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  • Recommended 5th Wheel Rail Kit for a 2023 Chevy Silverado 2500
    Yes, you can definitely install a 5th wheel hitch without the factory puck system. It looks like back in 2020 you bought the Demco Autoslide 5th Wheel Trailer Hitch item # DM8550034 from us. To install it in a 2023 Chevy Silverado 2500 that doesn't have a puck system you will need the Reese Quick-Install Custom Outboard Installation Kit w/ Base Rails item # RP84FR. This is a custom fit kit that installs in existing holes in your trucks frame. If you're using a different 5th wheel hitch...
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  • What is the Best Gooseneck Hitch for a 2024 GMC Sierra 2500 w/out the Puck System?
    Congrats on your new truck! Yes, there is a gooseneck hitch for your 2024 GMC Sierra 2500. The best one is the B&W Turnoverball System item # BWGNRK1020. This hitch fits both the 6-3/4' and 8' bed lengths and the diesel and gas models. It installs with custom fit brackets that bolt into existing holes in your Sierra's frame. The only drilling you will need to do is in the bed when you add the holes for the receiver and the safety chains. This underbed system has a 30,000 lbs capacity and...
    view full answer...
  • Recommended 5th Wheel Rails for a 2024 Chevy Silverado 2500 w/out the Puck System
    To add a set of 5th wheel rails to your 2024 Chevy Silverado 2500, I recommend the Reese Quick-Install Custom Outboard Installation Kit w/ Base Rails item # RP84FR. This set of rails is industry standard which means it will work with your Reese M5 item # RP30928 and most 5th wheel hitches on the market. The brackets are custom fit and install in pre-existing holes in your Chevy's frame. The custom fit brackets work with both the 6-3/4' and 8' bed lengths. I have linked the installation...
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  • Recommended In Bed 7-Way and 4-Way Connector for a 2024 Chevy Silverado 2500
    Yes, it will. The Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector - 7' Long item # C58FV puts a 7-way and 4-way connector in the bed of your Silverado and allows you to keep the one on your bumper. This makes hooking up to your 5th wheel trailer easier and more convenient.
    view full answer...
  • Recommended Gooseneck Hitch for a 2024 GMC Sierra 2500
    For your 2024 GMC Sierra 2500, I recommend the B&W Turnoverball Underbed Gooseneck Trailer Hitch item # BWGNRK1020. This custom fit system works with both the 6-3/4' and 8' bed lengths without the OEM puck system. This system has a 30,000 lbs capacity and is also a mounting platform for B&W Companion 5th Wheel Hitches like the item # BWRVK3500 and the sliding Companion item # BWRVK3400. I have linked an installation video below. To make towing with a gooseneck trailer easier, I recommend...
    view full answer...
  • Recommended 5th Wheel Rails for a 2024 GMC Sierra 3500 w/out the Puck System
    Congrats on the new truck! To add a set of 5th wheel rails to your 2024 GMC Sierra 3500, I recommend the B&W Custom Installation Kit w/ Base Rails item # BWRVK2505. These rails are made in the USA and fit both the 6-3/4' and 8' bed models. They also fit the gas, diesel, and models with dual or single rear wheels. The B&W item # BWRVK2505 rails are industry standard which means they are compatible with most 5th wheel hitches on the market. The brackets are custom fit and install in pre-existing...
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  • Does the B&W Turnoverball Underbed Gooseneck Trailer Hitch Fit a 2024 Chevy Silverado 3500?
    Yes, it does! The B&W Turnoverball Underbed Gooseneck Trailer Hitch item # BWGNRK1020 does fit the 2024 Chevy Silverado 3500. This gooseneck hitch is custom fit for your Chevy and mounts to existing holes in your truck's frame to speed up installation time. It fits both the 6-3/4' and 8' bed lengths along with the diesel and gas models. It is also compatible with the duallys. The B&W item # BWGNRK1020 has a massive 30,000 lbs capacity. This underbed system allows you to store the 2-5/16"...
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  • Recommended Custom Fit 5th Wheel Rails for a 2024 Chevy Silverado 3500
    To add a set of custom fit 5th wheel rails to your 2024 Chevy Silverado 3500, I recommend the Curt Item # C16429-204. These rails are specifically designed for your Silverado and install in pre-existing holes in your truck's frame. They fit both the 6-3/4' and 8' bed lengths along with the diesel and gas models. They are also compatible with the duallys. I have attached a couple of pictures below that show the brackets installed along with an installation video to help you get these rails...
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  • What is the Best Gooseneck Hitch for a 2024 GMC Sierra 2500?
    The best gooseneck hitch for a 2024 GMC Sierra 2500 is the B&W Turnoverball System item # BWGNRK1020. This hitch is custom fit and includes all hardware necessary to complete installation on your truck. It has a massive 30,000 lbs capacity. This underbed system allows you to store the 2-5/16" hitch ball upside down and inside your bed when you are not using it. This gives you full access to your bed when you're not towing. The locking handle is easily accessible inside your driver's side...
    view full answer...
  • Recommended In Bed 7-Way Connector for a 2023 GMC Sierra 2500
    To add a 7-way connector to the bed of your 2023 GMC Sierra 2500, I recommend the Curt 5th Wheel/Gooseneck Custom Wiring Harness item # C58FV. This harness puts a 7-way connector in the bed of your truck and allows you to keep the one on your bumper. This makes hooking up to your gooseneck or 5th wheel trailer easier and more convenient.
    view full answer...
  • Recommended Gooseneck Hitch for a 2024 GMC Sierra 2500
    I would be happy to! To add a gooseneck hitch to your 2024 GMC Sierra 2500, I recommend the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit item # BWGNRK1020. This hitch is custom fit and includes all hardware necessary to complete installation on your truck. It has a massive 30,000 lbs capacity. The B&W item # BWGNRK1020 includes custom fit brackets that bolt into existing holes in your Sierra's frame. The only drilling you will need to do is in the bed when...
    view full answer...
  • Dimensions of 7-Way Trailer Wiring Bracket
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    Image 1 for
  • Recommended Gooseneck Hitch for a 2023 Chevy Silverado 2500
    Yes, there is. To add a gooseneck hitch to your 2023 Chevy 2500, I recommend the B&W Turnoverball Underbed Gooseneck Trailer Hitch item # BWGNRK1020. This kit includes custom brackets that mount in preexisting holes in your trucks frame. This system has a 30,000 lbs capacity and includes a 2-5/16" gooseneck ball that can be flipped over and stored inside the hitch. It will fit both the 8' bed and the 6-3/4' bed lengths without the OEM puck system. I have linked an installation video below...
    view full answer...
  • Recommended 5th Wheel Rails for a 2024 Chevy Silverado 2500
    To add a set of 5th wheel rails to your 2024 Chevy Silverado 2500, I recommend the Curt item # C16429-204. This set of rails is industry standard which means it will work with most 5th wheel hitches on the market. The brackets are custom fit and install in pre-existing holes in your Silverado's frame. To make towing with a 5th wheel easier, I recommend adding the Curt 5th Wheel/Gooseneck Custom Wiring Harness item # C58FV. This harness puts a 7-way connector in the bed of your Silverado...
    view full answer...
  • Recommended Gooseneck Hitch for a 2024 Chevy Silverado 2500
    For your 2024 Chevy Silverado 2500, you will want the B&W Turnoverball Underbed Gooseneck Trailer Hitch item # BWGNRK1020. This gooseneck platform is custom fit for your Chevy truck. It mounts to existing holes in your trucks frame to speed up installation time. I have attached a couple of pictures along with an installation video below so you can see what this system looks like once installed and how to get it set up. To make towing with a 5th wheel easier, I recommend adding the Curt...
    view full answer...
    Image 1 for Image 2 for
  • Recommended Gooseneck Hitch for a 2024 Chevy Silverado 3500
    To add a gooseneck hitch to your 2024 Chevy Silverado 3500, I recommend the B&W Turnoverball Underbed Gooseneck Hitch item # BWGNRK1020. This hitch is custom fit and includes all hardware necessary to complete installation on your truck. It has a massive 30,000 lbs capacity. It fits both the 6-3/4' and 8' bed lengths. I have linked an installation video below To make towing with a 5th wheel easier I recommend adding the Curt 5th Wheel/Gooseneck Custom Wiring Harness w/ 7-Pole Connector...
    view full answer...
  • Recommended 5th Wheel Rails for a 2024 GMC Sierra 3500 w/out the Factory Prep Package
    Congrats on the new truck! To add a set of 5th wheel rails to your 2024 GMC Sierra 3500, I recommend the B&W Custom 5th Wheel Installation Kit item # BWRVK2505. This set of rails is industry standard which means it will work with most 5th wheel hitches on the market. The brackets are custom fit and install in pre-existing holes in your Sierra's frame. They fit both the 6-3/4' and 8' bed models. I have linked an installation video below to help you get them set up. To make towing with...
    view full answer...
  • Recommended 5th Wheel Rails for a 2024 Chevy Silverado 2500
    To add a set of 5th wheel rails to your 2024 Chevy Silverado 2500, I recommend the B&W Custom 5th Wheel Installation Kit item # BWRVK2505. This set of rails is industry standard which means it will work with most 5th wheel hitches on the market. The brackets are custom fit and install in pre-existing holes in your Silverado's frame. I have linked an installation video below to help you get this set of rails set up. To make towing with a 5th wheel easier I recommend adding the Curt 5th...
    view full answer...
  • Recommended Gooseneck and 5th Wheel Hitch for a 2024 Chevy Silverado 2500 w/ a 6-3/4 Foot Bed
    I would be happy to help you! Since you do not have the puck system the best way to set up your 2024 Chevy Silverado 2500 with a 6-3/4' bed to pull a 5th wheel and a gooseneck trailer is to use the B&W Turnover Ball System item # BWGNRK1020 and the B&W Companion Sliding Hitch item # BWRVK3400-5W. The B&W Turnover Ball System item # BWGNRK1020 is a gooseneck hitch that has a 30,000 lbs capacity and installs beneath your Silverado's truck bed. This underbed system allows you to store the...
    view full answer...
  • What is the Highest Capacity Gooseneck Hitch for a 2024 Chevy Silverado 2500?
    The highest capacity gooseneck hitch for a 2024 Chevy Silverado 2500, is the Curt Custom Underbed OEM-Style Gooseneck Hitch item # C60642. It has a massive 32,500 lbs towing capacity. This hitch includes a 2-5/16" gooseneck ball. It bolts to your Silverado with custom fit brackets and inserts in pre-existing holes in your truck's frame. I have linked an installation video below to help you get this hitch set up. To make towing with a gooseneck trailer easier, I recommend adding the...
    view full answer...
  • Recommended 5th Wheel Rails for a 2024 Chevy Silverado 2500
    I would be happy to! To add a set of 5th wheel rails to your 2024 Chevy Silverado 2500, I recommend the Curt Custom Fifth Wheel Installation Kit item # C16429-204. These industry standard rails work with almost all 5th wheel hitches on the market today. The custom fit brackets mount inside pre-existing holes in your Silverado's frame. I have linked an installation video below to help you get these rails installed. To make towing with a 5th wheel or gooseneck trailer easier, I recommend...
    view full answer...
  • Recommended Gooseneck and 5th Wheel Hitch for a 2024 Chevy Silverado 3500 w/ a 8 Foot Bed
    I would be happy to help you! Since you do not have the puck system the best way to set up your 2024 Chevy Silverado 3500 with a 8' bed, to pull a 5th wheel and a gooseneck trailer, is to use the B&W Turnover Ball System item # BWGNRK1020 and the B&W Companion Hitch item # BWRVK3500-5W. The B&W Turnover Ball System item # BWGNRK1020 is a gooseneck hitch that has a 30,000 lbs capacity and installs beneath your Silverado's truck bed. This underbed system allows you to store the 2-5/16" hitch...
    view full answer...


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Do you have a question about this Custom Fit Vehicle Wiring?


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Michael B
Installed by:
Michael B
Employee Sabrina W
Written by:
Sabrina W

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