I've been married (to the same Admiral) for 36 years and still don't understand her some of the time so I should not be surprised that after 13 years I Still don't understand the systems on my 310. Last weekend I noticed that the microwave was not working and my diagnostic brain went into circuit beaker, microwave plug in the cabinet (not GFIC), checked other AC outlets and no power in the other galley GFIC outlet or the V-berth outlet (not GFIC) or the head (not GFIC????). Well, the 15 amp breaker must have blown. So, I had a spare and replaced the breaker (always place a towel under your work or you will loose another nut or screw into the abyss in back of the electrical box). Microwave and outlets still don't work. Now it's time to look at the electrical schematic and, try to figure out why. Find that I forgot the GFIC outlet in the aft cabin so I reset that GFIC and everything works. I still don't understand why a tripped GFIC would shut down all the other AC outlets. Sort of like the old Xmas tree light strings. Is this a required electrical standard on boats? And, why not a GFIC plug in the head under the sink? The Admiral is still harder to understand since she does not come with a manual.
