> > If you check the voltage of the battery with the engine running, and
>with
> > the engine off, you will find a 1 to 2 volt difference

>
>         Unfortunately the problem with just this is that the lowest
>"engine on"
>voltage may be below the maximum "engine off" voltage when you consider all
>conditions. For example, on a really cold day the "engine running" voltage
>might be below the "engine off with fully charged battery" voltage. TTYL
>

I would find that surprising, but I'll grant that it's possible.

Measure the current.  It will flow one way as an indicator of engine
start-up, and the other way until the battery is re-charged from the
effort...

D.

_________________________________________________________________
Get holiday tips for festive fun.
http://special.msn.com/network/happyholidays.armx

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads