The "I don't wanna Start once the engine reaches Operating Temperature"
sure sounds like a Starter that needs Brushes and Cleaning.
[No One does,They just get a replacement]
(If it's Turning the motor over SLOWLY)
If you've got No Starter Engagement (Clicks or NOTHING) it MAY be connections.

'All sorts of tutorials in the Advanced Search section.
(You do not have enough Empirical information to make an Informed decision,Yet.)

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'84 300SD sold
124.128