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Crutchfield CK4

4-gauge amplifier wiring kit — includes power wiring only

Item # 007CK4

Crutchfield's 4-gauge amplifier wiring kit contains the wire and hardware necessary to supply power to your...

Crutchfield's 4-gauge amplifier wiring kit contains the wire and hardware necessary to supply power to your...

Item # 007CK4

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About the Crutchfield CK4

Buck Pomerantz

Deliver the power your amp deserves

Crutchfield's 4-gauge amplifier wiring kit contains the wire and hardware necessary to supply power to your amplifier safely, efficiently, and economically. This wiring kit does not include RCA patch cables or speaker wire. You may need to purchase those items separately, in order to complete your installation.

Deliver the power your amp deserves

Crutchfield's 4-gauge amplifier wiring kit contains the wire and hardware necessary to supply power to your amplifier safely, efficiently, and economically. This wiring kit does not include RCA patch cables or speaker wire. You may need to purchase those items separately, in order to complete your installation.

Power ratings and amp efficiency

Most amplifiers come in two distinct "Classes" of technology with different efficiencies and power wire size requirements. Class AB amps typically feature 50% to 60% efficiency, while Class D amps are usually 75% to 80% efficient. This Crutchfield wiring kit was designed to accommodate the energy demands of a Class AB amplifier with a total output of up to 700 watts RMS, or a Class D amp with up to 1,100 watts RMS output.

CTA-2015 Compliant

Crutchfield wire

Crutchfield wire is made of oxygen-free copper, with no impurities that could raise its resistance to a signal's flow or add interference. Crutchfield wire meets all Consumer Technology Association (CTA-2015) standards for size, resistance, and insulation quality.


Product highlights:

  • amplifier wiring kit
  • RCA cables and speaker wire not included
  • maximum power ratings: Class AB: 700 watts RMS, Class D: 1100 watts RMS
  • oxygen-free copper wires meet all ANSI and CEA standards
    • 17 feet (5.2m) of 4-gauge red power wire with ring terminal
    • 3 feet (0.9m) of 4-gauge black ground wire with ring terminal
    • 17 feet (5.2m) of 18-gauge blue remote turn-on lead wire
  • brass mini-ANL fuse holder and two 50A fuses (100A total rating)
  • assorted hardware
    • 6 feet (1.8m) of 4-gauge black split loom
    • 4-gauge firewall bushing
    • two 22-18-gauge butt connectors
  • six wire ties
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # CK4

What's in the box:

  • 17' Length of 4AWG power wire (red translucent jacket and terminated with ring-terminal on one end)
  • 3' Length of 4AWG ground wire (black translucent jacket and terminated by a ring-terminal on one end)
  • 17' Length of 18AWG remote turn-on wire (blue jacket)
  • Fuse holder
  • Two 50A Mini-ANL fuses (installed in fuse holder)
  • Firewall bushing
  • 2 Butt-connectors
  • 6' Length of split loom
  • 6 Wire ties

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Crutchfield CK4 reviews

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More details on the Crutchfield CK4

Mark G.

Product Research

Features & Dimensions

Power & Ground Wire:

  • Gauge: 4 AWG
  • Wire Construction: Tinned Oxygen Free Copper (1862 strands)
  • Length: 17' (Power), 3' (Ground)
  • Diameter: 0.425"


  • Terminal Type: Nickel-plated brass ring-terminal (on Power & Ground wire)
  • Terminal Diameter: Outer Diameter = 0.635", Inner Diameter = 0.315"


  • Fuse Type: Mini-ANL (x2)
  • Fuse Size: Two 50A fuses in the parallel arrangement provide 100 total amps of protection (pre-installed in fuse-holder)
  • Fuse Holder: The included fuse holder should be installed within 18" of the battery; a 4mm Allen wrench is required for installation (not included)

Remote Turn-On Wire:

  • Gauge: 18 AWG
  • Wire Construction: Tinned Oxygen Free Copper (16 strands)
  • Length: 17'
  • Diameter: 0.105"

Included Accessories:

  • Grommet: 4 AWG firewall bushing
  • Butt-connectors: 22-18 AWG butt-connectors (2)
  • Loom: 6' length of 4 AWG split-loom
  • Wire-ties: 6

Installation Notes:

  • RCA cables and speaker wire not included (sold separately)
  • Installation tools sold separately

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Customer Q&A

17 questions already asked

Can I ground to the battery? It's in my trunk where the amp will be
[ THOMAS K  Aug 05, 2021 ]
1 answer
While it is technically possible to ground to the battery directly this is not good install technique. Any amplifier or electronics being add to a car system should be given it's own ground connection directly to the chassis of the vehicle. Grounding directly to the battery negative terminal is not recommended due to possible issues with noise in the sound system and possible damage to the aftermarket gear. If the factory battery ground cable becomes loose or is compromised in some way then the current for other vehicle systems may flow through the sound system and destroy it. For example when the vehicle starter motor is being cranked. That massive current draw would damage the entire sound system in just a few seconds. Don't ground directly to the battery negative terminal and do not stack multiple grounds atop one another. If there are multiple amps being added then use a ground distribution block for those.
[ Jeff  Mar 28, 2022 ]  Staff
Is it acceptable to use the supplied Red 4g wire from battery to the fuse box or should I use solid wire between batter and the box?
[ CHRISTOPHER  Jun 06, 2021 ]
2 answers
Hi C, I would double check with crutchfield. I wound up returning due to getting a different car. I'm pretty sure you should use an inline fuse to protect any equipment if some should happen.
[ JOE  Jun 10, 2021 ]
The Red 4ga wire is made to handle the large amounts of current your amplifier needs with very little loss. Not only would hooking to the fuse box defeat this, it would likely be a safety hazard as well. Best practices recommend wiring direct to the battery terminal with a fuse as close as practical to the battery. There are connectors available to assist you in hooking to the battery. The fuse should be sized to properly protect the 4ga wire. It's common for people to hook the black wire to the frame of the vehicle or to a significant area such as a seat bolt, this is why the black wire is often much shorter than the Red one. The black wire must be hooked to a clean surface, wire brush or wheel to clean to bare metal is a good way to do it. Even though there is a tough jacket on the Red wire, the protective split loom should be used to cover the wire in any place that could ever wear through and cause a short circuit, like thru the firewall. I've used install kits from Crutchfield MANY times and always had excellent results. They're my go-to source for sure!!! Good Luck!!! (if you aren't sure of yourself, you may want to consult a professional to install for you)
[ RANDALL  Jun 10, 2021 ]
Is the fuse holder actually large enough for the 4 gauge wire? Have bought a kit from Amazon before and the fuse holder was too small for the 4gauge wire that it came with.
[ REGGIE  Apr 08, 2021 ]
2 answers
Yes, I was very pleased with the quality of this kit.
[ VINCENT J LEON  May 01, 2021 ]
Yes, the fuse holder is the perfect size for the 4 gauge wire. I installed this kit about 2 years ago with ease and haven't had any problems since.
[ Patrick  Apr 30, 2021 ]
Will this handle a 120A fuse?... or do I have to get the TSPEC V10-AK4?
[ Greg Adam  Apr 08, 2021 ]
1 answer
It should, it comes with a fuse box/holder and fuses are included. Works fine for 1k watt system/Amp. I powered a alpine power pack 45×4 and a 650 watt rms monoblock Amp easily. No issues
[ Charles  Apr 08, 2021 ]
Do I need a rca cable if I already have a ddx2 kenwood radio?
[ Carson  Oct 05, 2020 ]
1 answer
This kit is for getting your amp powered and grounded. It will depend on your amp if you need RCA cables. The kit does not include any RCA cables.
[ MATTHEW  Oct 20, 2020 ]
Can you just install the one 50 amp fuse and leave out the second for a JL 600/4?
[ JAMES  Aug 30, 2020 ]
2 answers
We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question.
[ Thomas  Sep 15, 2020 ]  Staff
I only have one 30amp in mine but I'm running a different amplifier.
[ THOMAS  Sep 10, 2020 ]
I am looking at the JL Audio JX400/4D amp. It has a fuse rating of 40 amps, and recommends this wiring kit. The fuse holder, hold 2 fuses. Would I need a single 40 amp fuse, or 2 20 amp fuses in the holder? Or, something else?
[ Cary  Sep 20, 2019 ]
4 answers
Either option should work but two 20 amp fuses would probably be the safest/ best practice for that amp.
[ CASEY  Oct 12, 2019 ]  Staff
just get the wiring kit and you will be doing it right...the Crutchfield folks know their stuff and with the CK4 kit you will be covered!
[ BRAD  Oct 12, 2019 ]
1- 40 am fuse will work as both fuse holders serve one terminal.
[ Kenneth  Oct 11, 2019 ]
Use the manufacturer's suggested fuse rating to protect the equipment. 2- 20 amp fuses.
[ YVETTE  Oct 11, 2019 ]
Is the fuse holder waterproof or weather resistant?
[ Richard  Aug 29, 2018 ]
3 answers
Weather resistant
[ Matthew  Aug 30, 2018 ]
Neither ! Install in dry location only.
[ NICOLA  Aug 29, 2018 ]
Maybe from a splash or two but no, it isn't.
[ Kyle  Aug 29, 2018 ]
I have a kicker cx1200.1 running 2 12inch rockford fosgate p3d4 will this kit be my best option for wire/fuse size?
[ Babu  Aug 02, 2018 ]
1 answer
Im not sure which class amp you're running but I would look for a kit with a lower gauge wire (thicker) to handle power needs. A capacitor may be something else to look into!
[ OTIS  Aug 06, 2018 ]
is this CCA or true copper?
[ KYLE  May 15, 2018 ]
2 answers
It's a blend ; NOT 100% copper.
[ NICOLA  Aug 29, 2018 ]
If I remember correctly it was true copper I did not remember seeing any aluminum wanding when hooking up the kit
[ TOBY  May 21, 2018 ]
Will this kit work for a factory radio not aftermarket?
[ nelson  Sep 19, 2017 ]
1 answer
This will depend largely on your vehicle. For details on 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 what you will need for an installation.
[ KENNETH  Sep 20, 2017 ]  Staff
what size is the ring terminal on the end of the power cable?
[ fbrackin6  Jul 11, 2017 ]
1 answer
Its a bit larger than 5/16, so its setup for a standard battery terminal lug on a side post battery. Otherwise you should have no issue with it on a newer style car with the accessory post off the battery terminal. Hope that helps.
[ david  Jul 13, 2017 ]
Is there a benifit to having x2 50a fuses over x1 100a fuse?
[ Taahir  Oct 12, 2016 ]
3 answers
Considering the design of the device, you will have a safety net of one 50A fuse, if the other blows. This could also mean a cheaper cost of replacement, and the added benefit of maintaining a degraded state operability, but I recommend replacing any blown fuse immediately because you will reduce the maximum flow of electricity your amplifier can recieved, limiting your power output to the speakers.
[ Matthew  Oct 12, 2016 ]
I believe it can split current draw and if one fuse goes out you have another. This is okay if you have around a 250-450 watt amplifier. If you have a 500 watt plus amplifier, I would quickly replace the blown fuse. I have this wiring kit installed and it is a solid product. I highly recommend it.
[ MATTHEW  Oct 12, 2016 ]
To be honest, I can't think of a serious reason. Perhaps the 50 a fuses are more available, or less expensive. I haven't had to buy any replacements yet, so I don't really know. But electrically, I can see no benefit. It may make the combination a little more sensitive. In other words, if a fuse blows from a 10% spike in current, it would take 110 amps to blow the 100 amp fuse. But 105 amps would cause one of the 50's to blow. But I'm just speculating.
[ Peter van der  Oct 12, 2016 ]
I recently purchased a "Crutchfield CK4" Amp wiring kit. The fuses for this unit, do not look standard to me. I just haven't seen them before. Can I purchase spares, in the case that something goes wrong and one blows?
[ Peter van der  Oct 03, 2016 ]
2 answers
Hellon Peter, The fuse you are referring to is called a mini-ANL fuse which can easily be purchased from any automotive parts store. Hope this helps.
[ Greg  Oct 04, 2016 ]
Yes you can, most electronic stores or a local stereo shop should have them. Depending on your area I've even found them at my local auto parts store. The kit works great, I wouldn't be worried about it.
[ Claude  Oct 03, 2016 ]

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