Lee,
A five year old motor should not be having a problem with the starter motor  
unless you have run the snot out of it. My bet is still on the solenoid. It's 
a  cheap, easy replacement. If that doesn't correct the problem, then I would  
pull the starter and take it to an automotive electric or alternator shop.  
They should be able to rebuild it, if necessary, for a fraction of the cost of 
a  new one.
When disconnecting the solenoid, remember to disconnect all power going to  
the motor. :)
 
Rummy



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