As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT ENGINE CHANGE, FRESH OVERHAUL ALT INSTALLED AFTER 9.0 HOURS OF OPERATION NOTED ERATIC ALTERNATOR OUTPUT. INSPECTED ALTERNATOR AND DETERMINED ALTERNATOR DRIVE COUPLING SLIPPING. REPLACED ALTERNATOR DRIVE COUPLING WITH OVERHAULED LIKE ITEM AND REINSTALLED ALTERNATOR ON AIRCRAFT.