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How can you tell if its your battery or atenator in a 1999 Buick century?
Wiki User
∙ 10y ago
With the engine running at idle check the voltage at the battery with a digital voltmeter set to the 20 Volt DC scale. You should get a reading of 13.5 to 15.5 Volts if the alternator is functioning as it should. If you get less than 13.5 V or more than 15.5 V the alternator is suspect. If the voltage reading is good then suspect the battery is defective.
Wiki User
∙ 10y ago
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