As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BRAIDED-WIRE-TYPE BATTERY TERMINAL STRAP BECAME LOOSE AT NEGATIVE TERMINAL CAUSING HIGH RESISTANCE, HEAT, AND ARCING, AND TOTAL ELECTRICAL SYSTEM FAILURE (INTERMITTENT). SUBMITTER STATED CONCERNS: POSSIBLE EXPLOSION DUE TO BATTERY GASSES. RECURRING PROBLEMS WITH BRAIDED BATTERY TERMINAL STRAP - NUT TORQUE CAUSES DEFORMATION - SHOULD BE CHANGED TO SOLID-TYPE WIRING. SAME FAILURE OCCURRED ON PA31-350 AIRCRAFT.