On Fri, 18 Sep 1998, K M wrote:
> I am a bit confused about the wiring of this device. As I understand,
> to detect the flow of current the meter is wired in line. But this and
> most all the devices that I have seen used in cars are not wired this
> way -- it would be too hard to get the huge wire under the dash! So I
> kinda figure that there must be some induction device somewhere that
> "sends" the reading to the gauge. Am I way off base here? Thanks, Kim.
The way it PROBABLY works is as a voltmeter. It has some relatively small
gauge wires and measures the voltage drop across a small (say 0.05 ohms or
less, could even be some length of wire) resistor wired in series with the
battery. If the full scale range of the ammeter was, say, 5 volts, then
the corresponding full scale amperage read on the scale would be
(5/.05)=100 amps. I emphasize that I have not measured any of these
values, just tossing out some typical numbers.
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