Re: Engine On/Off Indication From Lead Acid Battery

"Hans-Bernhard Bröker" <HBBroeker@xxxxxxxxxxx> wrote in message
news:h71g17$hnl$01$1@xxxxxxxxxxxxxxxxxxxx
But none of that bears much relevance to the actual question. The
answer to that is a solid "Don't do that!" If you want to know if the
main engine is running, acquire that signal at its source, not at some
barely related point several massive disturbances away from it.
Guessing what the voltage at a terminal shared by an alternator, a
battery, and probably a several active loads might mean is just a
nightmare waiting to haunt you.

Jumping into this thread: The suggestion might already be made but every
alternator I know of has a 'W' terminal, outputting an AC voltage directly
from the windings, commonly used to connect to a revolution counter. That
would be your best source to check whether the enginge is running or not.

Meindert


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