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CHARGING TIME REQUIRED The time required to charge a battery will vary, depending upon the following factors: • Battery Capacity - A completely discharged heavy-duty battery requires twice the charging time of a small • Temperature - A longer time will be needed to charge a battery at -18° C (0° F) than at 27° C (80° F). When • Charger Capacity - A battery charger that supplies only five amperes will require a longer charging time. A • State-Of-Charge - A completely discharged battery requires more charging time than a partially discharged The Battery Charging Time Table gives an indication of the time required to charge a typical battery at room tem- BATTERY CHARGING TIME TABLE Charging Amperage 5 Amps 10 Amps 20 Amps Open Circuit Voltage Hours Charging @ 21° C (70° F) 12.25 to 12.49 6 hours 3 hours 1.5 hours 12.00 to 12.24 10 hours 5 hours 2.5 hours 10.00 to 11.99 14 hours 7 hours 3.5 hours Below 10.00 18 hours 9 hours 4.5 hours IGNITION-OFF DRAW TEST The term Ignition-Off Draw (IOD) identifies a normal condition where power is being drained from the battery with A vehicle that has not been operated for approximately twenty days, may discharge the battery to an inadequate Excessive IOD can be caused by: • Electrical items left on. • Inoperative or improperly adjusted switches. • Inoperative or shorted electronic modules and components. • An internally shorted generator. • Intermittent shorts in the wiring. If the IOD is over thirty-five milliamperes, the problem must be found and corrected before replacing a battery. In 1. Verify that all electrical accessories are off. Turn off all lamps, remove the ignition key, and close all doors. If the vehicle is equipped with an illuminated entry system or an electronically tuned radio, allow the electronic timer 8F - 12 BATTERY SYSTEM - SERVICE INFORMATION WK |