This was sent to me but I think it was meant for the list.
Dave
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From: charles frink <acltpvd@hotmail.com>
To: <dave1massey@cs.com>
Subject: RE: [Wedge] Alternator question
Date: Thu, 9 Feb 2012 16:17:54 -0500
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I would think regulator is bad. Overcharging can warp battery plates by
generating excess heat due to excess voltage, then again I am comming in late
on this topic.
> From: Dave1massey@cs.com
> Date: Thu, 9 Feb 2012 07:54:28 -0500
> Subject: Re: [Wedge] Alternator question
> To: randy@tessfamily.com; tr8@mercury.lcs.mit.edu
>
> In a message dated 2/8/2012 7:39:15 PM Central Standard Time,
> randy@tessfamily.com writes:
> > So I hook my meter to my battery while the car is running and the volts
> > show
> > 16.8
> > hummm.
> >
> > I take the alternator in to have it rebuilt and it bench tests fine at
> > 14.3
> > volts.
> >
> > I clean all the contacts, ground points, etc and re-install.
> >
> > I started the car and it reads 16.8 volts at the battery posts.
> >
> > What else can cause this?
> >
> > Thanks,
> >
> What is the ambient temperature? Many voltage regulators have a
> temperature curve to them. Batteries will tolerate higher charging voltages
at lower
> temperatures so the regulators have been designed to maximize charging to
> suit. So an alternator that regulates at 14.3 at room temperature (70 degF)
> will charge at a higher voltage at lower temperatures.
>
> Still, it must be really cold if it goes all the way to 16.8. But was it a
> solid 16.8 or was it 16.8 at idle and even higher at speed?
>
> Dave
> --
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