Chech the electrical circuit from the ignition key to the starter motor
To test this circuit an automotive test light is needed.
Attach one end of the test light to engine ground and the other end at the starter trigger terminal of the starter solenoid.
The test light should illuminate when the ignition switch is activated (crank engine over).
If the test light illuminates the starter motor/solenoid has failed and needs to be replaced.
If the test light does not illuminate suspect a neutral safety switch or clutch safety switch if provided.
A wiring diagram is needed to trace power from the ignition switch through the safety switch and down to the starter solenoid.
Replace failed components as needed and recheck system.
I had this problem once in my case it turned out to be voltage drop. After the power goes from the key barrel through a couple of connectors to the starter motor it can lose enough voltage so that it wont have enough power to fire up the starter solenoid. This can happen if those connections (esp older cars) have some corrosion and when they are warm it creates more resistance hence the voltage drop. Once it cooled down it had enough voltage to fire the starter motor. The solution was to install a relay that used the starter wire as a trigger to send power directly from the battery through the relay to the starter motor. If you dont feel confident enough it is a simple job for an auto electrician. Anyhow it might or might not be in your case but I hope it helps.
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