Voltage Readings

[Curt Sprenger]

Dash Voltage - My experience is the dash volt gauge should read about
13.5 volts. Gauges get old and the calibration may be off, so with the
engine running, use a meter and take a volt reading at the alternator .
12.5+ is good, especially with the new batteries. Also take an AMP
reading at the alternator. If there are positive AMPs the alternator
should be good. AMPs will vary depending on the alternator load.

AMP Gauges - I'm not sure about the '82FC. The one in the step-well is
probable tied in with the generator and shore power. The dash gauge is
probable the engine alternator AMP output. With the generator running,
or hooked to shore power, and the power source set to GEN or SHORE,
check the step-well gauge with no load, then again with a couple AC
units running. No load = low reading...two AC units on = higher reading
of maybe 20 or 30 AMPs. Check the dash AMP gauge while conducting this
test.

Jeff Miller or others will add clarity to this I'm sure.

Hope this helps.

Curt Sprenger 1987 PT38, Anaheim Hills, Calif.



Scott Forman wrote:

> I don't know a lot about electricity, so I need some help here:
>
> What should the voltage reading on the engine volt gauge be while
> driving? I have always thought that when driving normally, the volt
> gauge should read somewhere around 14.5 when the alternator is
> putting out properly. Last night, when driving home from a repair
> shop where several items were replaced (including 4 new batteries),
> the gauge was only reading a bit above 12 when driving. Should I be
> concerned about my alternator?
>
> Also...what is the purpose of the 'Amps' gauges? What do they
> demonstrate? My 82 FC has one on the dash and also one at the power
> switch in the step well. Neither gauge ever seems to move much if at
> all. What should these two gauges be showing me?
>
> Thanks
> Scott Forman
> 82 FC35RB
> Memphis
>
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