I don’t know what you have there but
the solenoid has 2 small control posts & 2 big posts allowing battery high current to reach the starter while…. the inner small coil gets battery from the key START and the other side is grounded via whatever safety device hooks up to it to prevent false starts.
as far as I know NO VOLTAGE should pass between a large post to a small post. the big posts being simple relay in and out lugs…
isolated from the rest of the world
the small posts control the solenoid inner electromagnet to close the contacts when starting. the marine tech drawing is what you should use imho.
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