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Rockford Fosgate RFK8i 8-gauge amplifier wiring kit — includes power wiring and 2-channel patch cable

Item # 575RFK8I

9 questions - 10 answers

Item # 575RFK8I

In stock

About the Rockford Fosgate RFK8i

Buck Pomerantz

This wiring kit does not include speaker wire, so you'll need to purchase that separately to complete your amp installation. This kit includes patch cables for a 2-channel or mono amp — you'll need to add cables for multi-channel amps.

Your amp needs big power wires in order to deliver top performance to your sound system. Rockford Fosgate's RFK8i amplifier power and signal wiring kit supplies everything you'll need to send power and input signals to amplifiers with fuse ratings of up to 60 amperes. Rockford Fosgate makes the 8-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 8-gauge power cable
  • 3 feet of 8-gauge ground cable
  • 20 feet of 18-gauge turn-on lead wire
  • one 16-foot twisted pair RCA patch cable
  • AGU fuse holder and 60-amp fuse
  • assortment of wire termination hardware and cable ties
  • warranty: 1 year
  • MFR # RFK8I

What's in the box:

  • One 17' Power cable (8-gauge) in a red translucent jacket (has an in-line 60A fuse/fuse holder and a ring terminal on the battery end)
  • 3' Ground cable (8-gauge) in a translucent gray jacket (with a ring terminal on one end)
  • 16' Twisted pair RCA patch cord
  • 20' Turn-on lead in a blue jacket
  • Ten 4" wire ties
  • 1 Plastic grommet
  • 5 Plastic butt connectors
  • 6 Female quick slide connectors
  • 5 Male quick slide connectors

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More details on the Rockford Fosgate RFK8i

Mark G.
The Rockford Fosgate RFK8i replaces these items:

Product Research


General Overview: This is a single amplifier wiring kit that includes the power and ground cables, turn-on lead, one pair of stereo RCA cable and accessories required to install one amplifier. Speaker wire is 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 fuse holder attached to the power cable comes with a 60-amp AGU-type fuse.

Patch Cord: Twisted pair cable design is used for noise rejection, a split center pin helps secure the connections at both ends.

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Customer Q&A

9 questions already asked

Will this wiring kit work with the JL Audio ACP208LG-W3v3? And will I need anything else for the install?
ricky dunnigan  Oct 20, 2023
1 answer
If you're installing the JL Audio ACP208LG-W3v3 for use with an aftermarket cart stereo with RCA preamp outputs, then this kit will include the items that you'll need. However, if you're installing with a factory radio system, then I recommend reaching out to our advisors via online chat or phone at 1-800-324-9695 for help with selecting additional items.
zachary  Oct 20, 2023 (Staff)
What guage wire are the speeker wire?
castboy007  Apr 08, 2023
1 answer
This Rockford Fosgate RFK8i 8-gauge wiring kit does not come with any speaker wire included Ted. If you are using the Rockford Fosgate kit for a mono subwoofer amp, you will want to use 12-gauge speaker wire in the first link below. For amps that are under 75 to 100-watts RMS driving full-range speakers the 16-gauge wiring in the second link is a solid call!
bo  Apr 08, 2023 (Staff)
Can I use the 16' Twisted pair RCA patch cord as speaker wire?
maze reazm 1990  Jan 26, 2023
1 answer
No. This would not be advisable. This cable is only designed to carry line-level signal.
zachary  Jan 26, 2023 (Staff)
Does this have the wires to connect to 2 subwoofers or do I need to purchase another set of cables?
anthony  Mar 21, 2021
1 answer
This amp kit does not come with speaker wire which would is used to connect subwoofers to an amp. Typically, 12 gauge speaker wire is best for that:|12-gauge
jason  Apr 05, 2021 (Staff)
I have my sub hooked up to my amp which is on but my sub is not playing or how do you get it to play and it has a switch into other holes on the top but I plugged into the line at the bottom?
reese  Dec 26, 2020
2 answers
If you purchased the product from Crutchfield, feel free to contact our Tech Support team. Our toll-free Tech Support number is printed on your invoice, and is also available under the "My Orders" tab in the "My Account" section of our website. If you did not purchase the unit from Crutchfield, then you may want to contact the manufacturer.
kristina  Jan 07, 2021 (Staff)
Make sure your sub is hooked up to your amp and the gain is on, second make sure your RCA cables are all attached and if you have a aftermarket radio sometimes the output of subwoofer is turned off from factory so make sure your SW signal is turned on within the CD player
timothy  Dec 29, 2020
How many watts from an amplifier can this handle?
brad  May 13, 2018
1 answer
The 8-gauge amp wiring kit is best suited for amplifier's producing around 300-600 watts RMS. For more details or help figuring out which kit is best suited for your amp(s), please contact an Advisor directly by phone (888.955.6000) or online chat. Thanks!
david  May 29, 2018 (Staff)
Are the power wire/s long enough to mount amp in 3rd row seat side storage of 2008 Sienna?
j  Aug 06, 2017
2 answers
Yes the power wire and remote turn on wire should be long enough for that mounting position
halyn  Aug 09, 2017
Hey JC; I'm going to say "probably not" to that if you're running completely hidden. I used this kit for trunk mounting in a '99 Beetle routing it properly hidden under and behind panels. I had a bit over 12" to spare. Routing it hidden eats up cable very quickly. Hope this helps. John W.
john  Aug 08, 2017
2015 mazda 3 with bose system wiring?
olivia  Jul 13, 2015
1 answer
For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
kristina  Jul 13, 2015 (Staff)

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