350-amp Big 3 wiring upgrade kit

Item #: 122BIG3XS

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3 Reviews

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The one-step "Big 3" upgrade kit

 If your aftermarket audio system is putting a strain on the rest of your car's electronics, you might want to upgrade your factory wiring. Rated to 350 amps, this "Big Three" grounding kit will boost your electrical system's performance.

XS Power's Big3XS kit includes heavy-duty 1/0-gauge oxygen-free copper cables that replace (or augment) your vehicle's battery ground-to-chassis wire, the chassis-to-engine block wire, and the wire connecting the alternator's positive output to the battery's positive terminal.

Another bonus is that the 8.5 mm ring terminals are already crimped to the wires, so you won't have to replace the stock grounds unless you want to improve them or double up. Extra ring connectors are included, so you'll be able to trim the wires to length and replace the terminals if needed.

The Package

The 350-amp Big3XS kit includes: 

  • 1 6-foot XPFLEX 1/0-gauge power cable
  • 2 4-foot XPFLEX 1/0-gauge ground cables
  • 8 XS Power heat shrink tubes
  • 8 1/0-gauge crimp  crimp terminals (already crimped on the wires)
  • 10 wire clamps
  • 10 zip ties
  • 10 screws
Warranty: 1 year

XS Power BIG3XS Reviews

Average Customer Review:

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Awesome product

Written By Jon, Texas on Friday, August 07, 2015

Crutchfield Customer Review (What's this?)

Positive cable was the perfect length to reach alternator to battery. Negative cse was good length to ground battery to chassis. But the other negative cable could have easily been only a foot long to go from battery to chassis. This is for my 2013 mustang.

Pros: Decent voltage increase. Grade A wire.

Cons: Set length of negative cables. Would have been very nice if it came with the fuse/holder like XS other products.

Big Three Upgrade

Written By RT, Lithonia, Ga on Tuesday, March 24, 2015

Crutchfield Customer Review (What's this?)

Great product great price

Pros: Everything you need in one kit

Cons: N/A

Heavy duty

Written By Rick W, San Diego, Ca on Friday, November 07, 2014

Crutchfield Customer Review (What's this?)

If your picky like me these lengths won't be exactly the length your specific vehicle should have. But they work just fine. It did make my voltage go up. Sometimes making your own cables is the more cost effective way. And they are the correct lengths for the application.

Pros: Good product

Cons: Set lengths

Hands-on research

What's in the box?

Download owner's manual

  • One 6-foot XSFLEX 1/0-gauge power cable with ring terminals on both ends (blue)
  • Two 4-foot XSFLEX 1/0-gauge ground cables (pearl)
  • Two extra 1/0-gauge crimp-on ring terminals
  • 2 Heat shrink terminal protection tubes
  • 10 wire clamps
  • Ten 3" Zip-ties
  • Ten 1/2" Self-tapping screws
  • Instructions on the box

Product Research


Contents: The BIG3XS kit contains the following:

  • Power Wire: One 6' length of 1/0 gauge multi-strand power wire in a blue jacket (4704 strands/100% oxygen free copper ). Both ends have ring terminals attached; 0.715" wide and 0.330" inner diameter.
  • Ground Wires: Two 4' lengths of 1/0 gauge multi-strand ground wires in translucent pearl colored jackets (4704 strands/100% oxygen free copper). Both ends of each wire have ring terminals attached; 0.715" wide and 0.330" inner diameter.
  • Installation Accessories:
    • Two additional 1/0 AWG crimp-on ring terminals
    • Two XS Power heat shrink tubes (used with the extra ring terminals to protect exposed surface)
    • Ten wire clamps
    • Ten 1/2" Self-tapping screws
    • Ten 3" Wire ties

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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