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Just installed new alternator in my 97 840 ci. Bosch alternator instructions warned to fully charge battery(ies). Charged 6month old batteries to just under 12.6 volts. Car started every day for a week. Let it run 15 minutes each day. While running charge at the batteries was consistent at 13.5 (I expected 14 volts from the alternator). Today car would not start. Batteries read 9 volts I jumped the car and the charge at the batteries while running was now only 12 volts. What is going on. I hope I don't have another bad alternator or worse I hope one of the batteries is not bad and ruined the new alternator. Any thoughts would be greatly appreciated. Replacing this alternator was no picnic. I replaced both belts. Could the serpentine belt be too loose to run the alternator properly? Not getting any belt squeal
 
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