As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON MAINTENANCE RUN, THE LEFT BATTERY DISCONNECT LIGHT WOULD STAY ILLUMINATED WHEN THE BATTERY SWITCH WAS TURNED ON. INSPECTION OF THE SYSTEM FOUND THE DIODE AT THE BATTERY RELAY SHORTED. THE SYSTEM WAS REPAIRED AND AIRCRAFT RELEASED. (W)