Re: 13.8 Volts?/temp variations

["Kris Rayner" <veritech@fix.net>]

Sounds like the voltage regulator has gone out.  You can try 
replacing that first as it's cheaper than an alternator.  If the com 
on the alternator is chewed up though, you should replace the 
alternator.  The brushes on the regulator should be no less than 
about 8mm.

> Date:          Fri, 21 Aug 1998 22:16:30 -0400
> From:          "Wm. Josiah Erikson" <josiah@gsinet.net>
> To:            Scirocco List <scirocco-l@scirocco.org>
> Subject:       Re: 13.8 Volts?/temp variations

> 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
> > --
> > To subscribe or unsubscribe, send email to scirocco-L-request@scirocco.org,
> > with your request (subscribe, unsubscribe) in the BODY of the message.
> 
> 
> 
> --
> To subscribe or unsubscribe, send email to scirocco-L-request@scirocco.org,
> with your request (subscribe, unsubscribe) in the BODY of the message.
> 
> 
-----------------------------------------------------
                   Kris Rayner
    1981 VW Scirocco S - Soon to be a 16V :)-
            "What, behind the rabbit?"
                veritech@fix.net
        http://www.geocities.com/Tokyo/2422/
--
To subscribe or unsubscribe, send email to scirocco-L-request@scirocco.org,
with your request (subscribe, unsubscribe) in the BODY of the message.

------------------------------