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Rockford Fosgate RFK4

4-gauge amplifier power wiring kit

Item # 575RFK4

In stock

About the Rockford Fosgate RFK4

This wiring kit does not include speaker wire or patch cables. You will need to purchase those separately, in order to complete your amplifier installation.

Your amp needs big power wires in order to deliver top performance to your sound system. Rockford Fosgate's RFK4 amplifier power wiring kit supplies everything you'll need to send power to amplifiers with fuse ratings of up to 100 amperes. Rockford Fosgate makes the 4-gauge cable from 100% pure crystal-oxygen free copper wire so you can count on maximum signal transfer.

Product highlights:

  • amplifier wiring kit
  • cables meet or exceed the American Wire Gauge specifications and requirements
  • 17 feet of 4-gauge power cable
  • 3 feet of 4-gauge ground cable
  • 20 feet of 18-gauge turn-on lead wire
  • AFS/MAXI fuse holder and 100-amp MAXI fuse
  • assortment of wire termination hardware and cable ties
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # RFK4

What's in the box:

  • One 17' Power cable (4-gauge) in a red translucent jacket (has an in-line fuse holder and a ring terminal on the battery end)
  • 3' Ground cable (4-gauge) in a translucent gray jacket (with a ring terminal on one end)
  • 20' Turn-on lead in a blue jacket
  • 100-amp Maxi-fuse
  • Power Ring
  • Ten 4" wire ties
  • Plastic grommet
  • 2 Plastic butt connectors
  • Female quick slide connector
  • Male quick slide connector
  • Small red rubber boot
  • Large black rubber boot

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More details on the Rockford Fosgate RFK4

Mark G.
The Rockford Fosgate RFK4 replaces these items:

Product Research


General Overview: This is a single amplifier wiring kit that includes the power and ground cables, turn-on lead, and other accessories required to install one amplifier. Speaker wire and RCA cables are sold separately.

High Strand Power/Ground Cable: The power and ground cable are 100% Pure Crystal-Oxygen Free Copper (PC-OFC) and meet or exceed AWG (American Wire Gauge) requirements.

In-line Fuse Holder: The included in-line, water-tight fuse holder attached to the power cable comes supplied with a 100-amp Maxi-style fuse (not pre-installed in fuse-holder). The fuse-holder will also accommodate an AFS-type fuse.

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Customer Q&A

Crutchfield asked: Why did you buy this?
It has the ends already attached and comes with a fuse holder. [ Bob  May 08, 2020 ]
To connect power from battery to amplifier. [ Justin  Apr 24, 2020 ]
RF is the best. [ Gail  Feb 05, 2020 ]
To power my two ten inch subs. Audio tube [ SARALYN  Sep 08, 2019 ]
Because I only needed the power supply cabling and this had an extra discount when purchasing it with an amp. [ Steven  Jun 16, 2019 ]
it matched the p1000x5 does it not [ congetto  Jan 22, 2019 ]
value [ John  Nov 11, 2018 ]
Price and extended warranty on my amp. [ Brian  Jul 14, 2018 ]
JC told me this would work well with my system [ Jamison  Mar 24, 2018 ]
kit works best with factory radios. [ corey  Dec 11, 2017 ]
price and I got all fosgate products [ Jack  Nov 16, 2017 ]
The RFK4 has the power I need to rock my 2 Rockford fosgate subs without breaking the bank. [ Cj  Nov 08, 2017 ]
Makes wiring up my Fosgate amp a breeze. I can't source the components individually for this price. [ Mark  Oct 25, 2017 ]
Rockford Fosgate's reputation and product quality [ retalsb  Apr 24, 2017 ]
perfect for classic car sub woofer and pre amp installation. [ James  Mar 16, 2017 ]
Works great as an affordable, quality 5 channel amp. No complaints! [ M  Feb 08, 2017 ]
Rockford cables rock... [ ron  Nov 20, 2016 ]
was needed for installation [ Tim  Aug 25, 2016 ]
I needed this to hook up the MTX amp...not my first choice, but you can't get the one I want here [ Marc  Jul 04, 2016 ]
Clean and non tacky. [ Jovino Nevarez  May 11, 2016 ]
Only the best please [ DAVID  Apr 12, 2016 ]
so I could get the extra warranty and for a few more dollars than just a 100 amp fuse holder and fuse which I need to wire up my new rf 600x4 I got the power wire which I can use for future installs [ Christopher  Mar 30, 2016 ]
Clarence from support helped me Mach my subs to a amp very good service here I like dealing with crutchfield because they have fast shipping and excellent customer support [ Dustin  Dec 23, 2015 ]
Name, price, and what I was looking for [ DIEGO  Dec 21, 2015 ]
100% OFC and highest maxi fuse rating. [ Matthew  Dec 16, 2015 ]
I picked this amp kit for the extra year warranty that will come with purchasing the amp. [ William  Dec 13, 2015 ]

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Looking for more?

Check out the next model in this lineup.

Rockford Fosgate RFK4X
Complete 4-gauge amplifier wiring kit
Includes patch cable and speaker wire
Temporarily out of stock
46 reviews
Add to cart

Get all the power and signal wires you need in one kit:

The Rockford Fosgate RFK4X offers these features:
  • one 20-foot twisted pair RCA patch cable
  • 30 feet of 16-gauge speaker wire