As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS RUNNING, THE ODOR OF BURNED WIRE INSULATION WAS NOTICED AND NR 1 GENERATOR LIGHT ILLUMINATED AND THEN EXTINGUISHED. AIRCRAFT WAS SHUT DOWN. THE BATTERY WAS DISCONNECTED. UPON INSPECTION, FOUND THE CABLE FROM THE BATTERY RELAY TO THE RCCR HAD SHORTED TO GROUND.