Install a light so display when the alt system is not charging. Inexpensive
(as aviation goes) and bonus is the light comes on in flight when the alt
goes off line. Been there. Nice to know before the battery is exhausted.

--

Thx, {|;-)

Victor J. (Jim) Osborne, Jr.
wrote in message
oups.com...
I was told the same thing from a UPS pilot friend of mine. While the
current draw to energize the alternator field is minimal it could make
a difference on a cold day(?) Just don't forget to hit the ALT switch
after engine start and verify the draw on the amp gauge.