Allroad Quattro V6-2.7L Turbo (APB) (2002)
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Disconnect battery Ground (GND) strap (arrow) with the ignition switched off.
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Measure voltage between the battery terminals.
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If meter indicates 12.5 volts or more, battery is in good condition.
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The battery's resting voltage should never fall below 12.5 volts, if it does, the battery should be recharged immediately. See: Battery, Charging
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Measure voltage between the battery terminals again.
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The battery resting voltage may not fall below 12.7 volts
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If the resting voltage is not OK, replace battery.