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GChuba: excellent question. No, the "master" switch is a simple Blue Seas switch which cuts the positive lead for the accessories power from the battery. Battery is under the left end of the bench seat, cable runs under bench seat where it splits aft to the motor, direct to the Mercury controls, and forward under the side console. A better "master" location might be early in that cable: I could mount it under the bench seat.

On that topic:

1) that would mean I'd be breaking the original circuits, which I was trying not to do, but which I will do if it seems important.

2) I would cut ALL power out of the battery with such a switch/breaker?

3) Are there "lockable" breakers, such that I could prevent use of the boat or accessories without inserting a key?

4) In an emergency situation, I could imagine console and electronics all smoking, but motor still working, getting me back to shore. But if I interrupt all battery power ...

5) For protection, BW installed a fuse or breaker (schematic shows fuse, but my memory says breaker) just outside the battery box. So I am protected, just not switchable at the point of protection.

I think I'm okay from a fire perspective ... but functionality?

BTW, my wiring and under-console looks a lot like Phil T's in the photos he shared.