Next message: Daryl Manning: "Motorsailors and Trawlers - WAS RE: lv-ab: selling Evening Star"
> There is a tremendous spike from the collapsing field from both starter
> motor and solenoid, when it is disconnected. In fact, in a previous
> discussion about an armed forces member killed by 12V (impossible), may
have
> been from this voltage spike. This is the same way that point type
ignition
> makes spark plugs spark, a collapsing field. Try holding your hand on a
> starter solenoid (or take my word for it), You'll jump about 10 feet! In
> addition there is likely a bunch of transient voltage spikes sent out
while
> the starter is running, arcing brushes look like dirty power to me.
> Lee Haefele
What you are saying is true, Lee, you can get a tremendous voltage spike
when the starter motor turns off. But the spike appears on the starter
motor lead that has just been DISCONNECTED from the battery so the spike
doesn't do any harm - the only thing it is connected to is the starter
motor. None of that spike is injected into the 12 volt starting battery
circuit. Spikes and arcing generated by the brushes will cause some noise
but to get anywhere it has to pass the battery and the circuit to, and
through, the battery has a very low resistance so any spikes that could
otherwise be dangerous, are absorbed by the battery.
Colin Foster,
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