On 27 Dec 2004 19:15:04 -0800, "Robert M. Gary"
wrote:

I guess my question is; do all planes generate about 13.6v with
accessories on? I also teach in a large variety of planes, but none
have a volt reader in the panel.


I'm not a mechanic, but 13.8 volts comes to mind as what I've read on
my battery while the engine was running. I'd think .2 volts less
under load would be acceptable. You still have 1.6 volts of excess
power to charge the battery with so I really wouldn't worry about it.
I think sometimes, with the new digital equipment, readings can be
more accurate than the tolerances of the old stuff used to build it in
the first place.

What's the tolerance of your voltage regulator? If it's +/- .5 volts,
you've got your answer.

My .02.
z