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					Originally Posted by  Anker
					 
				 
				Check the battery. It should hold 12.5V with the ignition off, 11V when the starter is engaged and 14+V when idling just after start. If it fails these, replace the battery and recheck after driving it for a week. If it still fails the voltage regulator or alternator are bad. 
			
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or you simply have a bad connection