What was found
ELECTRIC LIGHT ILLUMINATED ON APU START TIME FOR MORNING LAUNCH FAULT WAS AUX BATTERY CHARGER INOPERATIVE AND WAS RESET. ACFT GROUNDED. FAULT RESET NORMAL. OPS NORMAL IAW MM 24-31-31-710-801. CHECKED WIRE FROM D652 PIN 8 AT ELECT METERS P5-13 TO D10342 AUX BATTERY CHARGER FOR CONTINUITY & SHORTS IAW ENGINEERING. NO FAULTS FOUND. REF WDM 24-31-12. RECONNECTED D652. REMOVED AUX BATTERY CHARGER IAW MM 24-31-31. INSTALLED ROBBED AUX BATTERY CHARGER IAW MM 24-31-31-400-801. OPS NORMAL IAW MM 24-31-31-710-801.