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Just a note to Charles R. Patton: Good answer, Chas, unless you're blessed
with an after-market alternator with an internal regulator. These sense the
alternator's output voltage internally where you can't get at it - probably
even to adjust it. However, if one has the more traditional external
regulator, then running the sense input to the main battery relieves you of
the need for an adjustable one. Good point!

Incidentally, regardless of the size of the secondary battery (within
reason) if it's nearly discharged, it will initially take as much current as
a larger battery - just for a shorter length of time. Ergo, the diode
feeding it must be sized to be able to handle the maximum current that it
may demand.

Dan Schaefer

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