[no subject]

What is supposed to happen, is when the car is started up the alt has to be
energized, to do this the +12V runs through the light and then to the alt
to supply the needed voltage to get it going. once the alt is running, the
+12 (or more) volts that is applied from the alt end on the exciter wire
leaves no ground and thus the light goes out.

Unfortunately what actually ends up happening is that the wire actually
increases in resistance until the +12v that is supposed to be at the alt is
pulled down.  (last one I had it was about 10v) (check by disconnecting the
wire from the alt, turn the car on but not running and measure the voltage
at the exciter wire - should be a strong +12).  What then happens is the
alt does not actually energize correctly and thus it needs to be rev'd to
2000+ rpm so that the diode bridge inside can start supplying the needed
voltage to the internals of the alt.  Then the light goes out (unless it is
a really bad wire and the drop is enough to have the light glow dimly like
a ghost to haunt you...)

Easiest solution is to run a new wire from the light to the alt.  Cheap and
easy fix.

I am sure some more technical people on the list will chime in with a
better explanation of the system :)

Cory Langford


"William Yeckel (Lexmark International)" <b-wiyeck@xxxxxxxxxxxxx> wrote on
16/05/2007 10:08:10 AM:

> I will try to dig into the exciter wire possibility.  Had the alt
> checked out by All Star electric, and they said it was good.
>
> Thanks
>
> -Bill
>
> ________________________________
> From: Neptuno [mailto:neptunonc@xxxxxxxxx]
> Sent: Wednesday, May 16, 2007 9:24 AM
> To: William Yeckel (Lexmark International); scirocco-l@xxxxxxxxxxxx
> Subject: Re: Battery Light question
>
> Hello Bill,
>
> Exciter wire disconected and the alternator is not arming itself to
> charge the battery. Try turning the car seeing if the light is on
> then reving it up to 2000 rpm....Does the battery light go off? Yes?
> then it maybe a brake on that wire or it maybe loose or corroded.
> And like always check all grounds.... Wnat about brushes on the
> regulator? Does anyone else know if that would do it?
>
> HTH,
> Tony
>
> "William Yeckel (Lexmark International)" <b-wiyeck@xxxxxxxxxxxxx> wrote:
> Just got the 1980 s-pack back on the road again after doing some
> maintenance and trying to figure out an electrical issue which I
> though I narrowed down to a bad battery that has been replaced. All
> seems fine, car starts and runs fine. But there is a weird thing
> going on with the battery light where it will be on for about the
> first 10 minutes the car is running, then it goes off.
>
> Any ideas what might be going on here? Maybe some relay that does
> not kick in until it gets warm enough?
>
> Thanks!
>
> -Bill
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