> As I see it, the relay setup is just a switch that's in automatic.  What
> you're talking about is also just a switch but only with a manual mode.
> Having the ability to use battery #1 or battery #2 or both has its
> advantages.  The downside is having to remember to set the switch.

I bought a Westy with a switch installed by the PO.  It
works great.  I run on A, camp on B, then start on A
and then charge on A+B.  The big red wire still goes
only to A, so it won't charge only B, but that's fine.
It switches everything, so there's no messing with
wiring changes besides the wires to the switch.  It
is installed behind the driver's seat on the front of
the sink cabinet.  I can reach around while driving
and switch it--even to OFF if I want!  ;-)

But the remembering IS the weak point.  I have trained
myself to deal with the sink drain cap and the switch
together when I set up or break camp.

                        Richard A Jones
                        Boulder, Colorado