As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE 3 WIRES COMING FROM THE STATOR ARE SHORTED OUT ON THE CASE. THIS IS THE 4TH ALTERNATOR OVERHAULED BY FACILITY WITH THE SAME FAILURE. ALL 4 ALTERNATORS HAD LESS THAN 390 HOURS SINCE OVERHAUL. THERE NEEDS TO BE MORE INSULLATION ON THE 3 WIRES.