what size megafuse?

good info guys, yes that makes sense that there's no need to fuse the starter & I was just thinking of protecting the whole system at the battery but it ain't set in stone cuz this is new territory for me. I will see if O'reillys can full field the alt & get a amp # and I have a 12 gauge output wire from the alt.
If you go Ford type starter relay then only a short wire from the battery to the relay has power all the time the rest of the cable only when starting.