Steve,
I'm interested in discourse because I have 1978 C27 #3587, and would like
to trade notes and ideas.
First the batteries: That is a good location for the batteries for several
prime reasons, keep the weight low in a boat, and keep the cables short
between the batteries, the battery switch, and the starting motor.
I recommend battery boxes to cover the batteries from shorting metal things
(boat hooks, etc.) and to isolate the battery acid from other things. If
the boxes are keep clean, then one can put all kind of things in the port
deep cockpit locker - fenders, life jackets, life-rings, spare lines (I keep
essential lines in the starboard locker along with the hatchway boards).
I also have the origonal wires, but with no corrosion. Perhaps its because
I'm on the Great Lakes with fresh water, and only a three-five month warm
boating season. The latest survey "dinged" us for the old wires - to which I
responded - " Do you see any corrosion?" What is right for other places is
overkill for the Great Lakes region.
As for servicing the batteries - I check the electrolyte about twice a
summer. That's all.
Where are you located?
Bob