alternator problems
 

95 S10 blazer, all was fine, then driving one day begin to smell battery acid and voltmeter was pegged high side. Got home, battery had boiled over and alternator not charging. Put on new battery and alternator, voltmeter showed 13.5 volts for a couple days then alternator quit charging. Replaced alternator and it was not charging, turned on lights, alternator started charging all the way to peg and then alternator quit charging. Replaced alternator, no charge at all. Anyone have an idea, will greatly appreciated. Thanks