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Q: Battery light blinks off and on on 2001 Oldsmobile Intrigue

Just had my 2001 Olds in the shop and the battery checked out good, however noticed today that the battery light will come on and after a while go off. It will stay off for longer then come back on. No issues with anything working so I wonder if this may be a short or something?
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it is possible the the altenator is wearing out not to get into detail but there are brushes that transfer power through the alt and over time they will wear out causing inconsistent power which trips the bat light on..when you were at the shop they should have load tested the altenator for output voltage.
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