charging problem

[SCHMIDT@LNS62.LNS.CORNELL.EDU]

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Noticed, for the first time yesterday, that after starting the engine (89 100Q)
the tach has to exceed 3,000 rpm before she'll start to charge (below that rpm
the needle sits a hair south of 12v, and the warning lights are on). Funny
thing is, as soon as it starts to charge, there's a MOAN from the alternator.

What gives here?  I replaced the regulator/brushes just last spring, and had
the armature refaced at that time.  Has anyone else experienced similar beha-
vior?  Must I sacrifice a chicken on the hood of the car?

Sure would like a clue about what to look for, cause I had a long trip planned
for this coming weekend (...isn't that the way it usually happens?)

TIA

jos