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Charging delays in 4000

Amidst the rest of the charging questions, here's another:
87 4000S, 4-cyl, at start up, the alternator does not charge at all until 
the revs rise to around 4000.  After the alternator "kicks in", it 
charges perfectly until the car is shut off again.  Then the cycle 
repeats.  A friend of mine with an 87 VW Fox has the same problem.  As 
far as I know, the alt. is Bosch.  It was on the car when I bought it a 
few years ago.  It has always been noisy (bearings??), and I thought it 
would die quickly, but just keeps on goin after about 2 years and 30k 
miles.  I replaced the battery right after I bought it, and it started 
during the -30deg. cold spell last winter here in Ohio.   I wouldn't 
care, but revving to 4000rpm early in the morning not only bothers the 
neighbors, but can't be too good on bearing surfaces when it's a cold