alternator issues

[Kent McLean]

I started up my '91 200 20V after it had been sitting for a few weeks.
The battery light was on, and the volt meter showed <12V (11.5?). I
checked the alternator belt, and it was in place and turning the
alternator. So I drove it for about 100 yds when the alternator belt
started squealing, at which point the voltmeter moved to about 12.5V.

Is this an alternator problem, voltage regulator, cable splice,
or something else?

-- 
Kent McLean
1999 A4 Avant, V6 Tiptronic
1991 200 TQA #3, with mods
soon-to-be-mine 1990 V8 w/5-speed and other mods
gone: '91 200 TQA x2, '94 100 S Avant, '89 200 TQ