Not Ranked
You have most likely already checked this but if all the things you listed don't prove out try looking at the starter. I had a similar problem years ago and checked everything including having the starter tested at a so called auto repair shop and they said it was good. I had another starter that fit that engine so just for trying something I stuck it in and I never had any problem after that. I put the original started back in to prove it and ass soon as the engine got hot and I stopped it wouldn't turn over, so I bought a new starter and never had another problem. Also check that your starter isn't close to a header as that can heat them up.
Ron
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