firehoser, I have 13 breakers on the 12vt side of the main panel and 9 breakers plus the shore power generator lock out breakers.
I have come to the conclusion, on the 12vt side, if there isn't an identifying breaker, it the power source is from the house batteries. I would like to split out the 12vt side even more but "ain't no mo room" on the panel so, I just live with it. SHRUG
If I open all the 12vt breakers and 120vt breakers, the boat is not dead (disconnecting the shore power cables). There is an interesting breaker called the '24hr breaker', located near the rotary battery switches. Shut the battery switch to off and the boat is still not dead. The bilge pumps power supply is on the '24 hour breaker' plus maybe one other load (I forgot). Sometimes, life gets complicated LOL It is called, 'learning the boat'. I think that '24hr breaker' is pretty good. Unless you purposely open that breaker, as you leave the boat, you should expect to return to a floating boat. (2X130watt solar panels.)
Someone (the designer) really thought this through.
A life's lesson here, if you don't have a breaker for it, it's on the house batteries or the 24hr breaker.' One nice thing, it is difficult to make this a dead boat, electrically.