As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING GROUND RUNUP, THE PILOT REPORTED THAT THE ALTERNATOR WAS DISCHARGING AND THE ALTERNATOR OUT LIGHT WAS ON. DURING TROUBLESHOOTING IT WAS FOUND THAT THE ALTERNATOR CIRCUIT BREAKER HAD FAILED, WITH AN ESTIMATED 17504 CYCLES. A NEW CIRCUIT BREAKER INSTALLED AND ALTERNATOR OPS NORMAL.