[HO455]

Originally Posted by 72SB

yes it could be the ignition switch or one of the wires to it is grounding.

Well not exactly if there was a grounded wire there would be melted wires or arcing.

There could be fused contacts in the ignition switch or the solenoid but that is usually indicated by the starter continuing to run when the key is switched to off. And the only way to stop it is disconnecting the battery.

The starter staying engaged after the ignition switch is off is generally a sign that the Bendix in the starter has stuck. Add the fact that tapping on the starter allowed the engine to be started, all the evidence points to a starter problem.

An improperly shimmed starter can cause this sort of problem but it generally shows up when the starter is new.

I hope my opinions help. Let us know what you find.