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XS Power BIG3XS

350-amp Big 3 wiring upgrade kit

Item # 122BIG3XS

 If your aftermarket audio system is putting a strain on the rest of your car's electronics, you might...

 If your aftermarket audio system is putting a strain on the rest of your car's electronics, you might...

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Item # 122BIG3XS

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$99.99
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About the XS Power BIG3XS

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.

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
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What's in the box:

  • 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

Customer reviews

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XS Power BIG3XS reviews

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9 reviews

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XS Power BIG3XS

Robert from Harker heights, TX on 4/12/2019

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It awesome I love the improvement it has made on my car!

Pros: Everything was perfect

Cons: None

Crutchfield response on

0 of 0 found this helpful

XS Power BIG3XS

Jason from Mountain Iron, MN on 2/25/2019

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very nice 100% OFC wire

Pros:

Cons: none

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0 of 0 found this helpful

XS Power BIG3XS

Crutchfield customer from Mcminnville, TN on 6/24/2018

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More than the product...excellent customer service!!!! Seriously I WAS a sonic Electronix customer....NO LONGER!!!! Crutchfield is awesome everyone super helpful and super fast shipping All shopping WILL b done at CRUTCHFIELD!!!

Pros:

Cons:

Crutchfield response on

2 of 2 found this helpful

XS Power BIG3XS

Joseph A. from Rockledge, FL on 5/7/2018

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If you want it too last with big power don't forget this must have.

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Cons:

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XS Power BIG3XS

Crutchfield customer from Beloit, WI on 4/22/2018

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Quality, heavy duty product. Plus, fast shipping. Can't beat that!

Pros:

Cons:

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0 of 0 found this helpful

Great kit

Alex from Glenview, IL on 8/29/2017

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I am very impressed with the quality of this kit. The only real negative has been mentioned by other reviewers: the cable from the battery neg to the chassis could have been 6 inches long and still worked in my car. Other than that, everything is good.

Pros: High quality cables and connectors.

Cons: None

Crutchfield response on

1 of 2 found this helpful

Awesome product

Jon from Texas on 8/7/2015

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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.

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3 of 4 found this helpful

Big Three Upgrade

RT from Lithonia, Ga on 3/24/2015

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Great product great price

Pros: Everything you need in one kit

Cons: N/A

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3 of 3 found this helpful

Heavy duty

Rick W from San Diego, Ca on 11/7/2014

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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

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5 of 5 found this helpful

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More details on the XS Power BIG3XS

Mark G.

Product Research

Features

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

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
A lot easier to reset than to contunuely replace fuses. [ Ben  Oct 01, 2018 ]
A
to help power flow from alternator [ Andre  Aug 10, 2018 ]
A
At just over 1500 rms on my system. I want my amps getting all the power my little alternator can give. [ H  Jul 04, 2018 ]
A
Quality name brand. Less expensive than eBay [ J  May 05, 2018 ]
A
Upgrading to hi output alternator. Running 1400 wat alpine system, you have to upgrade your electrical as well . [ herbert  Apr 12, 2018 ]
A
Quality, Sound, Brand, Price [ Harrison  Apr 09, 2018 ]
A
The cables are recommended by the manufacturer of my subs because they are 100% OFC (oxygen free copper) , I replaced my alternator with a high output amp (300+ amps) and was advised by the company to do a "big 3 upgrade" , this brand is used consistently by my sub manufacturer when they build systems for cars [ ZACKERY  Feb 17, 2016 ]
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3 questions already asked

Q
Will the cables be long enough for an suv (2000 gmc yukon xl)?
[ Cole  Nov 04, 2016 ]
1 answer
A
No it will not, the main power wire is only 6 foot long, my suburban needed 13 ft I think to make it to the back
[ Andrew  Nov 04, 2016 ]
Q
Do I replace the wires in the car with this or should leave them connected and just connect these on top? I figure this way there will be an extra connection on each line so maybe better?
[ Amer  Oct 20, 2015 ]
4 answers
A
Leave the original cables connected.
[ Eric  Oct 23, 2015 ]
A
Leave the current wires and use the XS wires as extra. You'll have more current with the more wire you have. Think of it as a bridge, the bigger the bridge the more traffic that can flow threw same thing applies with the wires. The more and/or bigger the wires the more electricity can flow threw it.
[ James  Oct 21, 2015 ]
A
The instructions state that either way is OK. But if in doubt as to what else may be wired up, add these in addition, and leave the original wiring connected.
[ JONATHAN  Oct 20, 2015 ]
A
I added to the existing wires.
[ RICK  Oct 20, 2015 ]
Q
On my 2008 impala it is a pcm controlled voltage. And there is a sensor near the battery that controls the voltage will I need to run the 0 gauge wire through that?
[ Cody  May 28, 2014 ]
3 answers
A
How To Install Big Three Upgrade... look for big 3 upgrade on you tube
[ Eric  Oct 23, 2015 ]
A
It's fine to hook as described the only difference it that I would fuse the power from the alternator to the battery with the according fuse for your system.
[ Rob Bass  Jul 30, 2015 ]
A
I'm not sure I took mine to a shop and got it done. Sorry I can't help you.
[ Rob  May 29, 2014 ]

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