Electrical probs in'88 90 Quatro

[Alex Dalati]

Hi All,

I just acquired a 1988 90 Quarto without getting any
history.  If driven every day it is fine.  If left un
driven for 48+ hours it will not start without a jump.
 I was told to disconnect one of the battery cables
while the car is running; if the engine does not shut
off then the alternator is OK and the problem is the
battery.  Is this true?  And Is this a common
electrical problem with the 90?

Thanks.
Alex

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