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Remove, clean, & resecure all battery -> starter circuit connections - both battery cables, the ground cable's connection to the body and the positive cable's connection at the starter motor (do that one with the battery disconnected). Do not assume these connections are OK because they look good and feel tight. Make the effort to ensure they are all 100%.
 

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Actually, that is quite common. When the cable connection is iffy, it can pass the small amount of electrons that flow when the key is first turned to 'on' but then fails completely when you try to run the starter motor (huge amount of electrons needed). Removing and reinstalling the cable gave it a little bit of cleaning.

Do all the connections, smear some di-electric grease on the cleaned areas then make sure the connections are snug. Di-electric grease prevents corrosion but won't interfere with a properly snug metal to metal connection. (petroleum jelly - vaseline - would probably work just as well)
 
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