Battery charging (blue wire again)

[drew at scirocco.cs.uoguelph.ca (Drew MacPherson)]

So can you suggest an effective method of "helping out" the exciter 
circuit while maintaining the warning light?  Ever since I went with the 
gas MFA cluster in the diesel I have to rev the engine to get the alt to 
self excite, which sucks, because my W-terminal tach doesn't start up 
until the alt is excited... :(  Although I can find no difference in the 
exciter circuit on the diesel cluster, it always fired right up.


Drew


On Mon, 7 Jul 2003, Allyn wrote:

> the circuit in the cluster may have gotten inductively kicked enough times
> (from shutting off the engine), to weaken/degrade it. this would prevent
> enough current from getting to the alternator to flash the field. also, the
> wire may just be old. every blue wire i have ever looked at has looked like
> crap (on a1's at least).
> Al
> 
> ----- Original Message ----- 
> From: "Euroroc II" <flaatr@yahoo.com>
> To: <Scirocco-l@scirocco.org>
> Sent: Monday, July 07, 2003 9:51 PM
> Subject: Battery charging (blue wire again)
> 
> 
> > So here is an interesting question...
> >
> > I understand that the blue wire runs from battery (+), through instrument
> > panel/warning light, and on to the alt.  It brings +12v to the alt.  The
> > current from this wire is used to get the alt going, called "exciting" the
> > circuit.  Without an initial current like this the alt will never get
> > going.  It's a good bit like priming a pump (plagiarized from a previous
> post).
> >
> > So why does my A2 Jetta start up and charge without the need to rev the
> > motor up to get the excitation voltage my Scirocco requires. I don't have
> > the Bentley for the Jetta yet to see if there are any differences but it
> > looks like the same alternator and basically the same instrument cluster
> >
> > -Raffi
> > .
> >
> >
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> > Scirocco-l@scirocco.org
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> 
> 
> 
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