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RE: Mark I, Now '73 B Alternator

To: <mgs@Autox.Team.Net>
Subject: RE: Mark I, Now '73 B Alternator
From: "Douglas Gaither" <>
Date: Fri, 10 Apr 1998 12:36:08 -0700

> -----Original Message-----
> From: []On
> Behalf Of Paul Hunt
> Sent: Friday, April 10, 1998 6:13 AM
> To: Dan Ray
> Cc:
> Subject: Re: Mark I, Now '73 B Alternator
> Dan Ray wrote:
> >
> > This is interesting, and brings up a good point. I just thought it was
> > normal for me to lose voltage while idling at around 900 rpm on my old
> > "dynamo". I don't have a stereo, so the only thing noticable is the
> > slowing and dim lights. I also assumed it was a generator and not an
> > alternator, but now that I've looked at the Haynes it seems all neg
> > cars had alternators. Now I'm confused. It's probably the original part,
> > still holding its own except for these symptoms.
> > I seek the wisdom of the list...any thoughts on my (more than likely)
> > dynamo? Replace the brushes? I did this once on my VW bug (generator),
> > I've learned my toy is a different B-reed altogether!
> Clausager reckons negative earth and alternators came in in 67.  So,
> are you sure your
> car is a '73 and are you sure it has a dynamo?  Alternator powered
> cars also exhibit
> lights dimming and blinkers slowing at idle.  About 850 rpm is
> required for charging,
> idle speeds range from 500rpm to 850rpm depending on spec and I
> suggest are usually set
> with no aditional electrical load, although I usually set mine a
> little higher to cater
> for about half the fan load.  When you turn on lights, blinkers etc
> the idle speed will
> drop a little, therefore the alternator will not be charging,
> therefore the running
> voltage will drop from circa 14v to circa 12v, hence the
> dimming/slower blinking.
> PaulH.

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