Hi -

papenfuss wrote:

[...] I'm not familiar with the PA-23 electrical topology, but
someone who does feel free to correct this thinking. It's probably
just like the PA-24 and older PA-28's, which have a single toggle
'Master' switch. [...]

The PA23-250 is the Aztec, a twin. My model has a split master, but
it's a Left-Right split. There doesn't appear to be a normal setting
that corresponds to a C172's battery-power-only configuration, just
the dual-alternator-failure emergency case (masters on, alternators off).

- FChE