thanks Kurt, I didn't know that, Graham
On Nov 16, 2011, at 6:27 PM, Kurt Nolte wrote:
Most alternators function a bit like "bottomless batteries" in that
they provide a voltage, and whatever current the circuit needs at
that voltage it supplies up to the limitations of the coils.
A depleted battery will draw a lot of current for the chemical
reaction needed to provide separation of charge, just like an empty
capacitor will draw heavier current as it stores electrons across
the plates.
A running vehicle won't force any more current through a jumpstart
than a battery will, nor more voltage, but it will allow for more
current to be available because the alternator can supply its
oomph. This is also probably why it is recommended that you don't
just ground the jumping vehicle on the battery, as the alternator
has a convoluted ground path to get there.
In a pinch you wouldn't really hurt the starter by giving it (and
only it) a quick shot of 24v; the windings can take it in brief
bumps. Obviously not a good idea for anything computerized or
involving lighting instruments.
Kurt
On Nov 16, 2011 1:48 PM, "paul annen" <[email protected]> wrote:
thank you kurt, i was thinking exactly the same....
and with a running engine you are giong to have an alt spinning
producing amps (and volts) and is set up on a voltage sensing
circut... most modern cars use a 60 amp alt, but this alt is only
putting out that much power when its sensing that the battery its
hooked to is dead (and still has enough voltage to excite the
circuit). i dont have a problem with jumping a bike with a running
engine, as long as it a 12v (nominal) source.. dont pull from a
24v truck or bus circuit, or a 6v golf cart battery (unless you
are doing it in pairs)... i also go against what most books tell
you and hook directly to the battery, not positive to positive and
then negitive to ground..
On Wed, Nov 16, 2011 at 1:33 PM, Graham Rogers
<[email protected]> wrote:
>
> as long as ...
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