|
|
3. Using a voltmeter connected to the battery posts, measure the open-circuit voltage. See the Open-Circuit Voltage Table. This voltage reading will indicate the battery state-of-charge, but will not reveal OPEN CIRCUIT VOLTAGE TABLE Open Circuit Voltage Charge Percentage 11.7 volts or less 0% 12.0 volts 25% 12.3 volts 50% 12.6 volts 75% 12.8 volts or more 100% 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 - 14 BATTERY SYSTEM LX |