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It sounds like an interuption of the 12 volt "start signal" from the ignition switch to the starter solenoid. This is the trigger that tells the solenoid to pull in and deliver current to the starter motor.
The things in the path are the ignition switch, the neutral safety switch, and the connections (connector) at the solenoid.
Of course, the solenoid itself could be intermittent.
If you have a DVM or test light, probe the connector at the small wire attached to the solenoid. It should show 12 volts when you turn the key to crank. If it does but the starter remains silent, then either the tab connector at the solenoid is making a bad (corroded) connection or the solenoid has an internal intermittent problem.
(Also, be sure that the heavy red wire delivering the heavy current to the solenoid is OK and properly connected at the solenoid.)
If you do NOT see 12 volts when you turn the key (but DO see it when it cranks properly), then you must do a little troubleshooting -- I'd look at the neutral safety switch, and then even consider the ignition switch. Neither of these are trouble prone, but neither are perfect. Both are relatively easy to replace (even as a diagnostic measure).
--
Don Foster (near Cape Cod, MA)
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