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Bad Alternator???
Just started noticing a humming/whining noise coming from the engine compartment of my 98 GMC Sierra with the 5.0L. This happens while at idle and when driving. I have turned off all heater controls and the radio and this still happens. Does anyone know if this could be a bad alternator or an alternator getting ready to go? Some days I do have trouble starting the truck as well. I thought that it was the battery getting old but maybe the battery just isn't getting charged properly.
Any help would be appreciated.
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