[mck531]

Hey John

As a control electrician I can tell you what to rule out.

While your car is running take a volt meter to the battery.

It should read close to 14 volts. A battery wont crank a starter if you don't have 12.6 volts or more. Also check the output of your altenator. It should be 14 volts.

Its possible you have a dead spot on your starter. I would keep an eye on it