Join Date: Dec 2002
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Ship-Shore Power Transfer Switches come in a wide variety of confugurations. You can determine which terminals are open or closed to each other /w an ohmmeter.
The (usually blue body, black handle) Rotary style switches cannot be reliably switched under load, and are very failure prone. I''d replace this, if it''s what you have.
I''d suggest a pair (1 each: shore & generator) of Double Pole (if 120V) or Three Pole (if 120/240V) Breakers with a Lock-Out Slide Device, such as Blue Sea Systems #4130/4131.