A voltage stabiliser on a voltmeter would defeat the purpose. The fuel
gauge works on the same principle (as the voltmeter) and has two crude
adjustment slots visible on the back of the gauge, does the voltmeter?
Otherwise I guess it is a dismantle job.
The correct output of the alternator is 14.3v to 14.7v at 5000 rpm.
Close enough, I would have thought.
PaulH.
Hans Duinhoven wrote:
>
> As I don't know this meter well, but have had some eletrical issues in my
> MGBGT '71 i digged around in the electrical world (started cursing as well
> due to not having fuses in the lines going to the rheostat of the gauge
> lamps..., not well designed though) there also is a voltage regulator, which
> might prevent this, or should this not be used on a voltage gauge?
>
> > From: JWidell625@aol.com [SMTP:JWidell625@aol.com]
> > Today, I went to tinker with the 77B and I decided to check the voltage
> > output. Much to my surprise, the voltage was reading almost 15v when I
> > revved
> > the engine, then tapered down to 14.5 volts after the battery charged up a
> > little. (battery was dead originally). My new "Smiths" volt gauge,
> > purchased
> > recently from XK, was reading almost 1.5 volts low, which was why I
> > originally
> > thought the alternator was bad. I checked across the volt gauge terminals,
> > and
> > found the voltage still reading 1.5 volts off, so the gauge is getting the
> > proper voltage.
> >
> > I have two questions:
> >
> > 1. Is the voltage from the alternator too high? 15 volts seems excessive,
> > though it did taper down.
> >
> > 2. Is there a way to calibrate a volt gauge, especially a Smiths?
> >
> > Thanks in advance.
> >
> > Joel Widell
> > Key Largo, FL
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