> If you look a this chart,
>
>
>
> http://dasko.co.nz/articles/alternator-terminals-explained
>
>
> It looks like all I would need to hook up to would be the "B"
> terminal and the ground and I can ignore the rest.
>
> Do I have this right?
You can try that, but I suspect the Ex terminal needs to get current through
the warning lamp (which provides excitation when the
alternator first starts turning), and the S terminal needs to get battery
voltage (The 'sense' input to the voltage regulator). You
can use a resistor instead of the lamp, if you want, but you'll still need an
external source of 12v to get it working (and a switch
to stop it from drawing current all the time). Just jumper the S terminal to
the B terminal, though.
> On an automotive alternator how fast does it normally have to
> spin to put out 12V?
They'll usually put out something with the engine idling, maybe 1000-1200 rpm
at the alternator. Full output requires more, though,
generally something like 5000-7000 at the alternator.
Randall
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