stuck ammeter

[Lizirbydavis@cs.com]

When I hit the starter, the needle usually gets stuck all the way to the 
right on the discharge side. If it starts, I have to rap on the dash to release 
it.  If I turn off the igniton, the needle usually falls without having to bang 
on it.  I have a bosch alternator with no changes to the wiring harness.  The 
car has been disassembled  and reassembled and everything works fine.  What's 
wrong here?
Joe Davis