If your car has a manual gearbox, look at the alternator clutch - its located within the alternator pulley and if it siezes it will sound like what you are describing.
As BYpro says above, you will have to remove the belt to access it.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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