As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING RUNUP, THE RT VOLT/AMP METER SHOWED ONLY BATTERY VOLTAGE WHICH INDICATED A PROBLEM WITH THE RT ALTERNATOR. AFTER FURTHER TESTING AND INSPECTION, IT WAS DETERMINED THAT THE ALTERNATOR WAS DEFECTIVE. REPLACED WITH NEW ALTERNATOR AND PROBLEM WAS SOLVED.