My ampmeter is pegging

Also when ground out happens usually blows voltage reg, then overcharges blowing the ballast resistor, and then could possibly blow alternator. I'm sure one of the gurus will help!
Now would be a good time to replace voltage regulator and ballast resistor, while there ordering parts have the alt & batt checked! If any of old parts are good save them for emergency spares.
Good Luck!