As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED BATTERY WOULD LOOSE CHARGE RAPIDLY. ALSO, RANDOMLY HAD STARTING PROBLEMS. TROUBLESHOT ELECTRICAL AND STARTING SYSTEM. FOUND MASTER CONTACTOR TO HAVE EXCESS RESISTANCE INTERNALLY CAUSING EXCESS AMPERAGE TO BE DRAWN DURING ENGINE START. 149 AMPS DC - SHOULD BE 12-18 AMPS. REPLACED MASTER CONTACTOR AND ALL SYS, OPS CHECKED NORMAL.