Wot Kev said ^^^^^ dry bearing in the alternator.
Also - try turning off the A/C to see if it makes a different to volume/tone. Could be bearing in clutch pulley?
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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