As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) ALTERNATOR GROUND LEAD HAD COME ADRIFT FROM ITS TERMINAL AT THE ALTERNATOR SOME TIME PREVIOUSLY AND HAD BEEN STOWED IN THE LOOM AND HAD NOT BEEN RETERMINATED. WITHOUT A GROUND, THE ALTERNATOR HAD BEEN GROUNDING THROUGH AN ALUMINIUM DUCT RESTING AGAINST IT. THIS CONDITION CAUSED THE ALTERNATOR ROTOR AND VOLTAGE REGULATOR TO FAIL.