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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