I have 208K+ miles on my original 1995 alternator and its still  working.  
However, my sister had a Geo that literally ate  alternators.  The problem?  
Misalignment due to a bent mounting  bracket.  You may want to check the 
angle for the alternator pulley in  relation to the crank pulley.  It could be 
that the alternator isn't  mounted as well as it might be, although it 
would have to be a slight off-angle  considering where the alternator is 
positioned on our cars.  Have  you replaced the crank pulley?  Perhaps its too 
far 
forward.
 
Jerry aka LGO
 
 
In a message dated 8/19/2010 3:19:43 P.M. Eastern Daylight Time,  
[email protected] writes:

 
I have replaced 3 alternators on  my 94 M. I am using guaranteed 
alternators from a salvage yard. These  alternators are still generating, the 
problem 
is the bearings. If I tighten  the belts to the proper tightness there is a 
serious knocking and grinding  noise that with a stethoscope I can trace 
defiantly to the alternator. The one  now on the car has started making the 
noise.  The belts are approximately  10 turns from tight.  I adjust the belts 
until there is no slippage and  stop there.  
Has anyone had this problem?  Please help. 
Bruce Andrews

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