Ted:
Your starter bushing is worn out!!I believe it resides in the
transmission case.The starter binds up because the pinion shaft is not
being held properly. Cheap and easy to replace; if you have the right
tool. 
Good Luck
Ken Lewis
86 VW Transporter Three Door Pickup
60 Porsche T-5 Coupe

On Thu, 26 Jun 97 22:14:33 UT "Ted Rodgers" <Rodgers356@msn.com> writes:
>I'm having the strangest problem with starting, and am out of ideas. 
I've had 
>the starter rebuilt, replaced the battery to starter cable, tried two 
>different fully charged batteries, checked the connections at the
battery and 
>the starter, and the wires at the top of the fuses.  
>With a fully charged battery (13+ volts) the starter spins, but if the
car 
>doesn't immediately fire the starter won't keep turning the engine get
 it started, as if there isn't enough capacity in the battery to keep it 
>turning.  You can still hear it trying, kind of a chuga chuga, but not
fully 
>turning the engine over.  At this point the battery voltage is down to 
>12.4-12.5.  The battery terminals are very warm, as is the starter,
although 
>the solenoid is cold.  
>If anyone has any ideas or other things to look for I'd be very 
>appreciative.
>
>Thanks.
>
>Ted Rodgers
>