As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT PULLED OUT OF HANGAR FOR MORNING FLIGHT, WOULD NOT START - BATTERY DEAD. AME REMOVED BATTERY FOR CHARGING. CHECKED ELEC SYS, FOUND THAT THE ALTERNATOR BELT HAD FLIPPED OVER ON THE RING GEAR AND WHEN PROP WAS MOVED, ALTERNATOR PULLEY DID NOT MOVE. ALTERNATOR REMOVED, FRONT BEARING HAD FAILED AND SHAFT WOULD NOT TURN. NEW ALTERNATOR INSTALLED AND NEW ALTERNATOR BELT INSTALLED.