Lets talk about voltage.

[sukchew at cox-internet.com (Chuck Blue)]

Find your local automotive elect shop and have them rebuild the alt.I will
be much cheaper than a new or rebuilt one.
ole blue
----- Original Message -----
From: "C Boyko" <roccit_53@scirocco.cs.uoguelph.ca>
To: "Chris Bennett" <scirocco16vr32@gmail.com>
Cc: <scirocco-l@scirocco.org>
Sent: Monday, November 07, 2005 6:45 PM
Subject: Re: Lets talk about voltage.


> Okay, I'm still screwing around with this same thing, BUT, if mine falls
> below 12V, the fuel pump goes out/car dies. I've done wires to death, and
> it only ever charges at 12.3 or so, and accessories knock it down to where
> I can kill the car by turning them on. It'll run fine without accessories
> on, and it starts really well. I'm buying an alternator aren't I?? And
> where's a good place to get one? I keep hearing myths of cheap Bosch ones
> at Canadian Tire, they want $279, since I won't have a core. That doesn't
> seem that cheap to me.
>
> Also, the fuel pump seems noisier when the voltage dips. Is this a case of
> "bad fuel pump causes the draw", or "fuel pump gets noisy when it doesn't
> have enough juice". The car seems to accelerate smoothly enough, it just
> dies at idle with a ton of accessories running.
>
> I just want to be triple sure before I beat a perfectly good alternator to
> death, it's not going to come off gracefully. Advice appreciated.
> cathy
>
>
> On 6:09:23 pm 11/07/05 Chris Bennett <scirocco16vr32@gmail.com> wrote:
> > I would suspect a loose connection to the voltmeter.  I would get a
> > multimeter and check voltage across the battery before I made a call
> > on that.  You should see 12-14 volts if your alternator is charging
> > properly.  Turn off all the electrical stuff you can and see what it
> > shows.
> >
> > In the alternator there is a diode bridge rectifier... these usually
> > work or they don't... not much in between.  I think if you lose one
> > diode it actually knocks two out of service and you get half as many
> > pulses (and it doesn't look like DC anymore.)  Not sure if this will
> > roughly half voltage or current.  I am thinking current.  Also with
> > the windings... they mostly work or don't.  (from my
> > experience...Please correct me if I am wrong.)
> >
> > Point is if you have 14 volts give or take one, then I would look for
> > loose connections, corroded connections and/or grounds.
> >
> > Remember Ohms Law.
> >
> > HTH
> > Chris
> >
> > On 11/7/05, Greg Pallett <greg.rocco@gmail.com> wrote:
> > >  So after asking about 90a alternators, and not having come to any
> > >  decision about that, I've been watching my volts gauge closely. I
> > >  don't think I like what I see. In normal traffic I'm showing 12
> > >  volts. Last winter, after Roger relayed my headlights, it was more
> > >  like 12+, but I don't remember how much over. Last night, running
> > >  just headlights (no fogs) and radiator fan, I was showing 11. THis
> > >  morning on the drive to work, I was showing 12 and was comfortable
> > >  with that. This afternoon, stuck in early rush hour traffic, with
> > >  the radio OFF and the only load being the radiator fan I was
> > > showing 11.5 or slightly less. I fear that in the dark of winter with
> > >  highbeams and a heater fan on it may be too much draw. As I
> > >  mentioned, I think last winter I had more volts to play with, but
> > >  I don't remember any numbers. Could this be a sign of an
> > > > alternator starting to get old? Yes, I know I sholuld/need to
> > >  check all my grounds, perhaps even add a fancy grounding kit?
> > >   Again, educate this fool.
> > >   TIA
> > >   Greg
> > >
> > >  --
> > >  Aronsons First Law
> > >  People who do crazy things are not necessarily crazy
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> > >
> >
> >
> > --
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> >
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