         
AM Radio Noise -A bad ground between alternator and the battery or between the radio and the battery -Make sure all brackets are reinstalled after an alternator change. -A noisy I.C. chip in a regulator -The hood must be well grounded -Is it Ignition or alternator noise? -Does it go away when the drive belt is off? -Radio Shack has a capacitor that will work for alternator noise most of the time Source: Various Auto Electric Technicians 
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