Adding on 2 circuits

Then run a BIG *** wire (with fuse) from alternator to battery

just out of curiosity what size wire would you call a BIG *** wire? 10 or even 8 gauge? 65’s used, I believe, 12 gauge. According to the 82 J Bodies FSM, they still used 12 gauge from the alternator - my engine compartment wiring is loosely based on a combination of J and early A wiring