ashleyp's post, for the big 3 is spot on, car audio centre also do it was a 2 gauge if u dont want such a fat wire dangling around!
unless your getting alot of dimming when bassing, you should'nt really need to do your big3, and you might find you could have a wanky charge and hold with the 0 gauge with the alternator to battery upgrade. so you could find that just doing the ground and chassis would be enough.
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