Re: 13.8 Volts?/temp variations

["Wm. Josiah Erikson" <josiah@gsinet.net>]

I know you weren't talking about my readings in general, but I have verified my
11V when cold/ 12.5V when hot with a guage right on the battery.
    -Josiah
        '83 Scirocco
    '84 GTi
    '86 Scirocco 8v
    '87 QSW
    http://www.gsinet.net/~josiah

Ilias Glavinas wrote:

> On 21 Aug 1998, Shannon Fenton wrote:
>
> > My Voltage guage reads lower when its cool outside also? I wonder why
> > this is?
>
> Your voltage gauge opposes the laws of nature.
>
> High school physics says: the battery has an internal resistance.
> Thus, if the battery can provide E volts, some of those E volts get dissipated
> in the internal resistance. So, actually, the battery is outputting:
>
> V=E-I*r, where I is the current output by the battery and r is the
> internal resistance.
>
> Now, resistance is directly proportional to temperature. So, in winter,
> when your battery is at 40F or so, its internal temperature is much
> less, thus giving you a lower I*r and thus a higher V. That is why we
> see some lovely 14V or so when we start up the car in December, and close
> to 13V when starting up the car in July.
>
> I suspect you have some strange connection somewhere in your voltage
> gauge-to-battery path.
>
> Ilias
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