As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) LT ENGINE STARTER REMAINED ON AFTER SWITCHING STARTER OFF. STARTER RELAY HAD STUCK ON DUE TO ERRODED CONTACTS. STARTER SUBSEQUENTLY OVERHEATED AND FUSED ITSELF. THIS CONDITION CAUSED ALL ELECTRICAL POWER AVAILABLE FROM THE AIRCRAFT CHARGING SYSTEM AND BATTERY TO GO TO THE STARTER AS A DEAD SHORT, THEREFORE ALL ELECTRICAL SYSTEMS WENT COMPLETELY DEAD IN APPROXIMATELY 30 SECONDS.