There's a lot of that going around with Randall these days. I just tested
him a couple of times this morning too!
Alex
----- Original Message -----
From: "Terry Smith" <terryrs@adelphia.net>
To: <triumphs@autox.team.net>
Sent: Sunday, July 16, 2006 12:39 PM
Subject: Re: [TR] Electric Fuel Gauge Question
> Randall,
>
> I knew that. I was just testing you.
>
> ...that's my story, and I'm sticking to it.
>
> :o)
>
> Terry
>
>
>
> >> I'd purchased a used fuel gauge for my TR3A. Trouble is, the fuse to
> >> F3/F4
> >> kept blowing. I've isolated it to the gauge by disconnecting output to
> >> the
> >> fuel gauge and running an inline fuse from a direct power source,
> >> bypassing
> >> the stabilizer.
> >
> > Terry, a stock TR3A gauge does not require a stabilizer, and having one
> > will
> > make the gauge act crazy. Do you have a TR4 gauge instead ?
> >
> >> I tend to think this is a fuel gauge problem, but I can't figure out
why
> >> a
> >> short to ground within the gauge would not short regardless where the
> >> leads
> >> are attached, since really a gauge is only a simple resister, isn't it?
> >
> > I can't make any sense of this statement at all. A short to ground is a
> > short
> > to ground, no matter what the rest of the circuitry is. And no gauge is
a
> > "simple" resistor, although all of them have resistance ... they are
> > always
> > arranged so that running current through the resistance causes some side
> > effect.
> >
> > An original TR3 gauge has two "resistors", which are actually coils of
> > wire that
> > form electro-magnets, but have a fairly high resistance. A TR4-6 gauge
is
> > a
> > single "resistor", again actually a coil of wire that forms a heater.
> > (The heat
> > causes a bimetal strip to deflect and move the needle.)
> >
> > No matter which gauge you have, an internal short to ground at one
> > terminal will
> > only blow the fuse if that terminal gets the supply voltage.
> >
> > Randall
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