As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATOR SYSTEM WAS SHOWING A DISCHARGE ON THE GARMIN G1000 DISPLAY DESPITE THE ALTERNATOR AND ALTERNATOR CONTROL UNIT FUNCTIONING PROPERLY. AFTER TROUBLESHOOTING IT WAS DETERMINED THAT THE GARMIN GEA71B (P/N 011-03682-0, S/N 497003704) AIRFRAME INTERFACE WAS THE PROBLEM. REPLACING IT WITH NEW P/N 011-03682-00, S/N 497006150 CORRECTED THE PROBLEM.