Alternator pulley
+1
It is enough to replace only the alternator pulley (with good quality INA part).
A second hand alternator might be a lottery.
Last time I changed the alternator pulley I took my alternator apart and replaced the two bearings which I found to be extremely dry (no grease at all) and noisy.
Check out SiRob's (cheshireD5) videos on youtube on how to check the alternator pulley.
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V70 D5 2002 Manual 517.000 km (321.000 miles)
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