Alt. Replacement

my 66 grenaded (quite literally) the shunt in the ammeter right in my driveway one day. bypassed the ammeter, but retained the accessory/fuse box/sign switch feed, wich was the original charge wire, tied it into a 60A firewall mounted manual reset circuit breaker and starter relay, with 4 GA. charge wire going from the Alt (78A square back) to the circuit breaker, and straight to the battery. never had a problem with lights or power since. I also installed a solid 4 GA ground wire to block, and a flat braided strap straight to the firewall.