if the alt lamp is on with the key off then it has done the rectifier, specifically most likely an exciter diode. the bearing noise you heard then is possibly most likely produced by a failing diode/ rectifier, not a mechanical failure. the battery will drain to earth quite quickly due to this fault. the only economic option is to buy a new alternator in my experience.
jc
The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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