The later Smiths/Jaeger gauges in many UK cars, and in the later AH for
that matter, are bimetal operated gauges, a current regulated by the
variable resistor in the sender heats a bimetal which will react in
bending, driving the needle pointer, however it reacts very slowly hence
a stable reading. These are fed by 10V provided by a small regulator
somewhere behind the dash. They have a ca. 90? window over the scale.
The early ones are coil operated which react instantly. A capacitor to
damped the reading is a good idea.
Kees Oudesluijs
Op 10-2-2017 om 23:29 schreef dwflagg at juno.com:
> Hey Simon,
> The Triumph Spitfires and GT6, I believe, had voltage stabilizers for
> the fuel gauge. Maybe they could be used in a Healey? I would defer to
> Michael for an answer.
> Cheers,
> Doug
>
> Hi Simon, I think that keeping any sort of energy storage device well
> away from the fuel gauge circuit is sage advice.
> I would suggest that you try this:
>
> http://www.netbug.net/blogmichael/2015/09/06/smiths-and-jaegar-fuel-gauge-solution/
> Michael S
> BN1 #174
>
>
>
> On Sat, Feb 11, 2017 at 7:29 AM +1300, "Simon Lachlan"
> wrote:
>
> Hi,
> I?d saved something relating to damping the fluctuations in my
> fuel gauge. I don?t recall if it was originally posted here or if
> I trawled it off the net. I?d made a few notes and filed it
> appropriately against some day in the future when I might get
> round to actually doing it.
> So, my nephew?s fuel gauge bounces around far more than mine and
> this prompted me to dig out the article/notes.
> First off, I agree that there?s no sense in putting the capacitor
> anywhere near the fuel tank.
> Having said that, I read the advice that I?d stored so carefully
> and began to wonder if I?d understood it correctly.
> Is the capacitor really supposed to be wired across the two
> terminals on the gauge? Would it have any effect? To put it
> crudely, but in the language that I can understand, wouldn?t the
> fluctuations still come down the Green/Black wire from the sender
> unit and hit the gauge?s terminal T? And wouldn?t those
> fluctuations still register as such on the gauge, totally
> unaffected by the capacitor?
> Shouldn?t the capacitor be wired in such a fashion that the
> fluctuations cannot bypass it?
> Maybe I?m over complicating things and should just try it without
> understanding it. Maybe I think too much.
> Simon
>
>
>
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