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twenty amperes or more will require a shorter charg- • State-Of-Charge - A completely discharged bat- tery requires more charging time than a partially The Conventional Battery Charging Time Table gives an indication of the time required to charge a CONVENTIONAL 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 OPEN-CIRCUIT VOLTAGE TEST A battery open-circuit voltage (no load) test will show the approximate state-of-charge of a battery. Before proceeding with this test, completely charge the battery. (Refer to 8 - ELECTRICAL/BATTERY (1) Before measuring the open-circuit voltage, the surface charge must be removed from the battery. (2) Disconnect and isolate both battery cables, neg- ative cable first. (3) Using a voltmeter connected to the battery posts (see the instructions provided by the manufac- See the Open-Circuit Voltage Table. This voltage reading will indicate the battery state-of-charge, but capacity. (Refer to 8 - ELECTRICAL/BATTERY SYS- - STANDARD PROCEDURE - USING THE MICRO 420 BATTERY TESTER) for OPEN CIRCUIT VOLTAGE TABLE Open Circuit Voltage Charge Percentage 11.7 volts or less 0% 12.0 volts 25% 12.2 volts 50% 12.45 volts 75% 12.65 volts or more 100% IGNITION-OFF DRAW TEST The term Ignition-Off Draw (IOD) identifies a nor- mal condition where power is being drained from the A vehicle that has not been operated for approxi- mately twenty-one days, may discharge the battery Excessive IOD can be caused by: • Faulty or improperly adjusted switches. • Faulty or shorted electronic modules and compo- nents. • An internally shorted generator. • Intermittent shorts in the wiring. problem must be found and corrected before replac- (1) Verify that all electrical accessories are off. Turn off all lamps, remove the ignition key, and close (2) Disconnect the battery negative cable. RS BATTERY SYSTEM 8F - 13 BATTERY (Continued) |