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Originally Posted by GoGriz!
I have a '97 Rodeo 3.2 w/new battery. The voltmeter reads a constant 12v regardless of what the vehicle is doing. When the rpm's go below 1000 the dash lights (brake light, battery light, 4wd indicator, etc.) go on and the blower motor kicks off. Once I rev above 1000 the fan goes back on and dash warning lights disappear. The alt belt squeals upon initial startup. Is this an alternator gone bad, or just a belt that needs to be tightened? Both? Neither? Any help is much appreciated! Thanks!
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Tighten the belt until it stops squealing then see what it does. If it still doesn't charge you're likely in need of a new alternator.