Okay - here are some photos of my electrical setup. I didn't have a chance to trace each of the wires/cables - I'll get to that next. For now, hopefully this will clarify things a bit in terms of how things are generally set up.
Let's start with the battery compartment under the aft berth. The various switches are...
Shown here from left-to-right are:
-1/2/All switch for the two "House" bank batteries.
-The slightly mislabeled "AC Source" (not House) switch for generator or shorepower (I'll fix that)
-The "Combine Batteries" switch for combining the house and start batteries.
-On/Off switch for the start battery
-Fuse (I think for the starter but I don't know)
-Generator start swtich
And the monster under the bed...
-The two green-topped house batteries, and the black start battery
The starter side components and wiring...
-You can see the positives coming off the start battery and running to the switch and the BlueSea ACR
Close-up of components...
-What I guess is a buss for the alternator connection to the left (not sure)?
-The BlueSea ACR - distributing the flow to each battery
-The backside of the start battery switch and the fuse
Closer-upper of components...
-The backside of the start battery switch
-That buss(?) just visible to the right
Now to the starboard house bank side...
-The blue thing is the AC Source switch
-I don't know what that buss with the green wires is yet - I assume it's the Combine Batteries switch wiring
-The two Group 27s that came with the boat
Again - as for alternator charging, when I tested everything with a voltmeter with the engine running, the starter battery and the house battery that the switch was set to was receiving charge. I haven't done the test with the switch set to "All" yet to see if the switch is directing the charge to the house battery - or if there is a fault in the ACR or cable going to the battery that wasn't receiving charge.
Next, the alternator. I couldn't see any markings on it and didn't have time to pull it and check - but if size is any indicator of amps, this is a very normal size alternator, not the volleyball size mentioned above for a 200amp-er.
And finally to the charger at the nav table...
The backside wiring...
And the panel...
Note: Unlike the alternator charge being dependent on the house switch, this indicates that both house batteries are always being charged and monitored regardless of switch setting. A good thing, I think.
When I get a chance, I'll start tracing wires and working out a diagram, but this is as far as I could get on this trip. There was, after all, sailing to be done.