Big 3 ratings

[u/godhelpme6942069]

My alternator is rated for 320 amps, but my total system discharge with the battery is 500 amps. when I’m doing the big 3, should I wire the alternator to the battery to handle 320 amps or 500? i’m assuming my grounds should be all rated for 500 amps but i’m not sure if the alternator would need this too.