Hi Derek,
If you are talking about your Healey's temperature gauge it is entirely
mechanical and has no electrical input other than the light.
If the gauge works but reads low I believe that the most likely cause is
that the needle has moved on its axle or the gears on the quadrant have
jumped inside the gauge which cam happen if the bulb is seriously
overheated.
Either way brain surgery is required..
Michael S
On Fri, May 24, 2013 at 9:54 AM, Derek Job <derek.c.job@gmail.com> wrote:
> My temperature gauge is only showing about 85 degrees when tested in
> boiling water. I understand that these gauges need a steady 10 volts to
> work correctly. What is it that regulates the supply of 10 volts? My car
> now has an alternator so no external voltage regulator.
>
> Derek
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--
Michael Salter
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