dixster,

The bdi should have all lights lit when fully charged, drop as the batteries are being used. If the BDI is not a full charge after being charged all night, need to check fluid level in batteries, all cable connections. When plugging in charger, test battery voltage to what the charging voltage is. Could have a failed charger or weak batteries. You should only charge when battery voltage drop to 24 volts. Fully charged the voltage reading should be 27 to 28 volts depending on the age. Good luck