It's an early '80ies Mazda;  I've never heard of such a thing, must be
an older design?  That does sound like it'd drive me nuts if I hit it
and didn't know what was going on, though - What era cars have those?

(It's bad enough dealing with bad connectors and corrosion in wiring,
when they throw in oddball things like that, it's time to replace with a
proper part IMO!  <G>)

  Mark

Russell McMahon wrote:
> Care !!
> Don't know if this is a modern car.
> Some older designs use a "gauge voltage regulator" which is a bimetallic
> strip voltage regulator (believe it or not) which applies PWM output at
> about 1 Hz rate :-) and gauges have sufficiently low time constant to ignore
> this. This overcomes dependency on battery voltage. Trying to understand
> what was going on if you hadn't met this arrangement may be interesting.
>
> I imagine this arrangement is not used in modern cars :-)
>
>       Russell McMahon

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