I don't think it's electrical. The starter gear gets jammed against the teeth on the flywheel. Try tapping the edge of the gear with a drift of some kind then try starting again. It won't solve the problem long term, but it will save you spending time troubleshooting an electrical problme that doesn't exist.
I would start with cleaning all the connections
battery
starter
Key switch
Somewhere in the electrical system you are not getting a good contact
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