If you don't have the equipment to do a load test on the starter (and the starter isn't binding), I'd take the starter in to have it load tested. It could be the brushes or solenoid that may be screwing with you.
Stewart


Stewart2
1955.1 3100
Both Owner and P/U have lots of miles, lots of history and need LOTS of TLC
Jack of several trades and experiences; Master of none