What was found
AUXILIARY BATTERY SHOWS 27 VOLTS AND A CONSTANT CHARGE OF 2 AMP THROUGHTOUT FLIGHT, ABNORMAL. ACFT GROUNDED. ACCOMPLISHED AUXILIARY BATTERY CHARGER. OPS TEST REF AMM 24-31-31. OPS TEST NORMAL, NO FAULTS. DURING GVI OF AUXILIARY CHARGER FOUND ARCING DAMAGE ON TERMINAL LUG ON CABLE W2532-0526-02. REPLACED AUXILIARY BATTERY CHARGER REF AMM 24-31-31 & TERMINAL LUG ON CABLE WAS R & R REF WDM 24-31-12, SWPM 20-00-13, 20-30-11. MAIN & AUXILIARY BATTERIES WERE REPLACED DUE TO THE ARCING DAMAGE AS A PRECAUTION. OPS TEST NORMAL.