Hello,
Here are a couple possibilities.
Dead/weak spot in windings inside starter.
Bad Ground
Corroded cables
To test for bad ground you can take a set of jumper cables and connect end to the negative terminal and the other to a good ground. Then try starting if starts normally then you have a ground problem, and will need to either remove and clean both ends of negative cable and the grounding point on the engine or just replace the negative cable.
If still acting the same would recommend remove the starter and have it test.
.
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Wednesday, January 27th, 2010 AT 11:35 AM