<VV> Serious starter problem

[Smitty]

So why wouldn't a starter always stay engaged when the battery was too weak 
to turn the engine or the engine was locked up?  Instead that almost never 
happens. (unless something else is wrong)
Joel McGregor
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Smitty Says:  One more time.  There is a large spring in the solenoid that 
is supposed to take it back to the retract position and disengage the gear. 
If the copper contact disc has become tack welded to the contacts, the 
spring can not pull the solenoid slug back.  As for the low battery and 
welded contacts situation, that is not all that uncommon.  It has happened 
to me plenty of times back when I had less money and was trying to wring the 
last possible start out of a failing battery.