Umm... What? So you're telling me my lights dim because my 0g grounds are not up to "snuff"? So if I have a big battery, and am running it on the stock wiring I'll never have to worry about dimming again?
No. thats not what im saying. Im saying the 0ga alternator wire is the worthless part. not the grounds..
since your likely running a large power wire to your amps. then you need a way for that large amount of power to return to the battery which is why you would upgrade the grounds.
same would be true with a HO alt. so then, and only then, you need to upgrade those wires.
without a HO alternator you won't be doing anything with those big wires on it. there for its a waste of time and money.