EFX PA4BX Wiring Kit

4-gauge amplifier wiring kit — includes 2-channel patch cable

Item #: 142PA4BX

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25 Reviews

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Get the right wire for your amp

The PA4BX wiring kit from EFX will supply your car amplifier with the wiring necessary for receiving its signal and powering up. The 4-gauge power and ground cables ensure that your amp gets all the power it needs to play music at its full potential. The ground cable features EFX's Ultimate Ground Terminal, which attaches to your vehicle's chassis by way of 3 self-tapping screws (included) to make sure you get a tight physical and electrically secure ground connection.

This wiring kit works with amplifiers with between about 450 to 1100 watts RMS of total output power. Please check your amplifier's installation instructions to confirm the proper size wire to use. The kit includes a stereo RCA patch cable, remote turn-on lead, in-line fuseholder, fuse, and an assortment of connectors and hardware to help with your amp's installation.

This wiring kit does not include speaker wires. You will need to purchase those separately, in order to complete your amplifier installation. This kit includes patch cables for a 2-channel or mono amp — you'll need to add cables for multi-channel amps.

Product Highlights:

  • amplifier wiring kit with power, ground, and audio connections
  • 17-foot blue 4-gauge power cable
  • 2-foot black 4-gauge ground cable with Ultimate Ground Terminal
  • 17-foot blue remote turn-on lead
  • 17-foot twisted pair RCA patch cable
  • 100-amp fuse and in-line fuse holder
  • 6 feet of flex loom
  • assorted mounting screws, crimp-on connectors, and wire ties
  • warranty: 90 days (no warranty on fuses)
  • Our 60-day money-back guarantee

EFX PA4BX Wiring Kit Reviews

Average Customer Review:

25 reviews
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Good Kit

Written By Adam C, Virginia on Sunday, November 22, 2015

Crutchfield Customer Review (What's this?)

This kit is good. All cables are good quality. It came up short on the power wire though in an 09 Impala. Other than that, good quality.

Pros: Wood quality cables

Cons: Power cord came up short

Great Quality!

Written By Scott, South Carolina on Saturday, October 17, 2015

Crutchfield Customer Review (What's this?)

Great quality product. I found cheaper but after looking at this one when it arrived it's definitely best deal for $$$

Pros: Great quality!

Cons: Would have liked a few more 4 gauge connectors to add for a capacitor etc.

Works fine

Written By Tim, MD on Tuesday, September 01, 2015

Crutchfield Customer Review (What's this?)

No problems using this kit. Recommended by an advisor. Price was right. Installed in a 2014 Accord 4 door. In my opinion the power lead wasn't very long. Ran it to the trunk and mounted to the back of the rear seat. only 8"-12" left. Not much wiggle room. The lead for the ground was very short as well.

No foresight in design

Written By Mike, New York on Tuesday, August 25, 2015

Looked alright out of the box, and it came with a set of RCA cables, which I needed so I figured it was a good deal. Not so. First of all, the ground terminal on the less than generous length of ground wire does not fit on any bolts you might find in/near the trunk of a car. I should not have to drill new holes in my chassis when there are plenty of perfectly good grounds in the area. Pressed for time I shoved it as far behind one of these as I could for now. Finish up everything and go to install the fuse in the block and reconnect the battery. Once the fuse is installed there is no way to tighten the screw one side slides into. It looks like there was supposed to be a hole there that wasn't drilled. It's pitch black out at this point and don't have time. Backed the screw out just enough to wiggle the fuse under and held it down by tightening the end cap of the block. Whatever. Went to connect the +battery, discovered the hole in the end was too small to fit over the screw on my 75 series battery, which aren't exactly uncommon. Was forced to drill it out only to find the connector wasn't long enough to allow clearance between the car's +12v and the battery terminal. I ended up having to use the 8 gauge wire from my old Kicker kit that ran from the fuse block to the battery. Now I can't safely push my equipment because of the bottleneck. Nothing I've ever had from the Scosche brand has been quality or a proper fit. Not worth the savings. Ruined install of an $1,100 system.

Pros: - Came with RCA cables. - It's a pair of 4 gauge wires.

Cons: - No thought put into the designs of the connectors. - Poor quality control. - Does not fit a common 75 series battery.

Wiring Kit

Written By Parker, Minnesota on Wednesday, August 05, 2015

Crutchfield Customer Review (What's this?)

Everything needed was included besides speaker wire, but that is relatively cheap and available on the site.

Pros: RCA wires

Cons: No speaker wires

Needs a longer ground

Written By NCLK, North Carolina on Saturday, July 25, 2015

Crutchfield Customer Review (What's this?)

Bought this to hook up my bass and amp in a boat - the advisor suggested this wire kit - problem is on a boat - you will likely need a longer ground if you mount the amp away from the engine and closer to the head unit. This kit is for a car - they need to mention this as I lost a week of my install time waiting for a 17' ground cable.

Pros: Good quality cable

Cons: Needs a longer ground for boat use.


Written By Jered, Washington on Friday, July 10, 2015

Crutchfield Customer Review (What's this?)

The only issue i had was the connection to my battery didn't work more of chevys problem then to do with the kit

Pros: All of it! Great sound no transfer or issues!

Cons: None

Amp wires.

Written By John, 75702 on Sunday, July 05, 2015

Crutchfield Customer Review (What's this?)

Nice heavy wire


Written By Austin, Fargo, ND on Thursday, June 04, 2015

Crutchfield Customer Review (What's this?)

Everything worked great and seems to function flawlessly

Pros: All wire is quality and was easy to install

Cons: No fuse was in the box but they sent me two for free and the guy was very nice and helpful also the ground wire was shorter than I would have liked

Good install kit

Written By KCHahn, Colorado on Tuesday, May 05, 2015

Crutchfield Customer Review (What's this?)

Good kit, that made installing a Kenwood amplifier fairly easy.

Pros: Plenty of Blue(hot) power cable to get from battery to back of extra cab Ranger. RCA cables plenty long also, as was the Auto On connection wire, between the Radio and the Amplifier.

Cons: Ground cable too short, depending on mounting location. Extra fuse would have been handy, since I blew mine by accident. Didn't use many of the other parts. Ran my cable through hood release cable plug, so I didn't need the grommet.

great wiring kit

Written By romerloc, Albuquerque, NM on Sunday, April 19, 2015

Crutchfield Customer Review (What's this?)

Great kit and half off with the amp I ordered.

Pros: Great kit!

Cons: None so far.

EFX PA4BX Wiring Kit

Written By Gabe, St James mo on Friday, April 10, 2015

Crutchfield Customer Review (What's this?)

Great all around wire kit for the money, again easy to run and nice fuse set up

EFX PA4BX Wiring Kit

Written By Rich, massachusetts on Thursday, April 09, 2015

Crutchfield Customer Review (What's this?)


Pros: Comes with everything needed to power a amplifier

New to car audio

Written By a1 bussin, Georgia on Friday, March 27, 2015

Crutchfield Customer Review (What's this?)

crutchfield recommended this so i I ordered this to go with m r 1200-1d amp. i have no issues with it so far and it was easy to install myself

Pros: easy install

Cons: none

very nice but...

Written By H, Ohio on Sunday, March 08, 2015

Crutchfield Customer Review (What's this?)

Exactly as described, came with connectors and everything you need to wire your amplifier.

Pros: Copper, good length of wire for positive, rca and remote.

Cons: Be careful, it's easy to strip the connections on the fuse block, very short ground cable, and the zip ties included break if you try to really tighten them down.

Install Kit

Written By azeqfleet, Arizona on Friday, February 27, 2015

Crutchfield Customer Review (What's this?)

Very nice kit!! High quality

short ground cable

Written By jorge, 99301 on Friday, February 27, 2015

Overall first impressions on this kit is ok. It came in a plain white box not very impressive. Quality doesn't seem bad but I couldnt find out if it was 100% oxygen free copper which for the price it should be. The ground cable is way short. I guess i should've read more carefully but for the price that seems a little stingy imo. Other than thay no complains.

Efx pa4bx wiring kit

Written By Dnybexk, New york on Tuesday, January 20, 2015

Crutchfield Customer Review (What's this?)

Great quality at a great price. Crutchfield comes through again!

Pros: Plenty of accessories included in this kit Power wire was the perfect length for my 07 double cab tacoma Instructions help during install

Cons: Ground wire worked for my situation but could be short in other situations. Power cable fuse housing could have a better design that is more waterproof. (Thinking about adding silicone to mine to waterproof)

EFX PA4BX Wiring Kit

Written By Anonymous, Louisiana on Friday, January 02, 2015

Crutchfield Customer Review (What's this?)

Good option if you are clueless, like me.

Pros: As advertised.

Cons: The firewall grommet is worthless, if you need it. The grounding cable is short, so make sure of your placement first.

Excellent kit for the money

Written By Tim, Dallas tx on Thursday, December 11, 2014

Crutchfield Customer Review (What's this?)

This kit has everything you need to hook up your high power amp.

Pros: The cables are very flexable and has a very high strand count.

Cons: I wish they would give you a spare fuse in the kit.

EFX PA4BX Wiring

Written By Tms, Houston on Tuesday, October 28, 2014

Crutchfield Customer Review (What's this?)

very nice price and good quality.

Pros: sturdy good grade cables and connector

Cons: could use better connetors and they should have wanred you need a bigger crimp kit to set

EFX wiring Kit

Written By Brian, Ofallon, mo on Wednesday, October 22, 2014

Crutchfield Customer Review (What's this?)

Great wiring kit so far. Easy to install and get through the firewall.

Pros: Not to much to say just yet cuz I've only been able to use them for not even a week yet.

Cons: Annoys me how short the ground wire is.


Written By DJ, SC on Tuesday, October 21, 2014

Crutchfield Customer Review (What's this?)

Had everything I needed to hook up my amp

Pros: includes everything needed...instructions make hook up a snap

Cons: for my installation, it would have been nice to have had two or three extra feet of power and ground wire length

wiring kit review 4g

Written By Bosco, Sacramento California on Monday, October 20, 2014

Crutchfield Customer Review (What's this?)

I upgraded the free 8g wiring kit to the 4g kit when I purchased the clutch field amp. Customer service was superb as always and they prorated the upgrade for me. As for the kit, the 4G wire is great, but one little thing, hence the one star minus is the 2ch patch rca, the 8g kit has gold plated connector and the 4G kit only comes with, assuming nickel rca connectors. Make no sense since the 4G is 30 dollars more. But I ended up using that for my sub so it's all good.

Pros: Price

Cons: Rca patch cable

Exactly as advertised

Written By Omar M, San Antonio, Texas on Saturday, September 06, 2014

Crutchfield Customer Review (What's this?)

I loved this kit. The reviews are spot on!!

Pros: Comes with everything you need.

Cons: None

Hands-on research

What's in the box?

Download owner's manual

  • 17' Length of 4 AWG blue power wire with in-line Mini-ANL fuse holder and ring terminal
  • 2' Length of 4 AWG black ground wire with Ultimate Ground Terminal
  • 17' Length of blue 18 AWG turn-on wire
  • 17' Length of Core-Twisted RCA interconnect cable (2 male RCAs on each end)
  • One 100A Mini-ANL fuse
  • 6' Length of black 3/8" split loom tubing
  • Firewall grommet
  • 2 Spade terminals for 4 AWG wire (1 red/1 black)
  • 1 Spade terminal for turn-on lead
  • 1 Butt connector for turn-on lead
  • 2 Self-tapping screws for fuse holder
  • 3 Self-tapping screws (for Ultimate Ground Terminal)
  • 6 Plastic cable ties (length=8")
  • Instructions

Product Research


Compatibility: The PA4BX kit is designed for amplifiers with fuse ratings up to 100 amps.

Kit Contents: This amp wiring kit includes the following:

  • Power/Ground/Remote wire: The power/ground wires use OFC (oxygen-free copper) for high-current delivery. The wires use fine strands of copper and soft-touch insulation for maximum flexibility.
    • 17' length 4 AWG blue power wire with in-line Mini-ANL fuse holder (no fuse installed) and a ring terminal (0.314" inside diameter, 0.66" outside diameter)
    • 2' length 4 AWG black ground wire with patent-pending Ultimate Ground Terminal for reliable ground connections.
    • 17' length of 18 AWG blue turn-on lead
  • Fuse: One 100A Mini-ANL fuse
  • RCA Patch Cable: 17' Core-twisted stereo RCA interconnect cable with split-top center pin and segmented shield for maximum contact and connection reliability. Twisted pair construction gives you maximum noise rejection and better sound quality. The RCA plugs have a micro barrel design and integrated strain relief.
  • Connectors: The kit includes the following crimp-on terminals:
    • Two 8-gauge crimp-on spade connectors (with 1 red and 1 black rubber insulator boot)
    • One 18-gauge crimp-on spade connector with red plastic boot (for remote turn-on lead)
    • One 18-gauge crimp-on butt connector (for remote turn-on lead)
  • Mounting Accessories:
    • 6' length of 3/8" diameter split loom to protect cables
    • 2 Phillips-head self-tapping screws (for securing the fuse holder)
    • 3 Phillips-head self-tapping screws (for securing the Ultimate Ground Terminal)
    • Plastic firewall grommet (0.406" inside diameter, 0.5" outside diameter)
    • Six 8" plastic wire ties
    • Instructions

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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