I agree, the big starter solenoid terminal is the only common point in the whole electrical system where the primary (most of the wiring, starter, lights, radio, etc.) and secondary electrical systems (ignition system... The one that will bite ya).
Problem has to be there.
OBTW... that intermittent contact can kill your alternator (if fitted). Connecting and disconnecting the output while running can burn out diodes. Your intermittent contact is the functional equivalent of connecting and disconnecting the battery + terminal.
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