As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI FOR DEPARTURE, THE NR 2 ELECTRICAL SYSTEM WENT TO ZERO VOLTS. UPON INVESTIGATION, FOUND NR 2 BATTERY CONNECTOR SOCKETS LOOSE ACCORDING TO BATTERY TERMINAL GO-NO GO GAUGE. SUBMITTER SUGGESTS THAT ELCON TYPE CONNECTORS BE CHECKED PERIODICALLY WITH TELEDYNE BATTERY GAUGE, PN TBP2132 OR EQUIVALENT.