As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LEFT ALTERNATOR WARNING LIGHT ILLUMINATED AND COULD NOT RESET CIRCUIT BREAKER. UPON INSPECTION OF ALTERNATOR, DISCOVERED THAT THE POSITIVE BATTERY LUG WAS LOOSE AND HAD CAUSED A SHORT TO THE CASE. THIS CAUSED BATTERY CABLE TO MELT AND TRIP BREAKER. ALTERNATOR AND CABLE END WERE REPLACED AND THE SYSTEM FUNCTIONALLY CHECKED SATISFACTORY.