[urq] Alternator condition : how to test or evaluate ?

[Ingo Rautenberg]

L-A,

I am no expert, but the other parts that can go wrong are the bearings can
go bad and the diodes can also go bad. The Audi Alternators are great in
that the Voltage Regulator and Brush Pack are one unit (which is what you
replaced). It is not uncommon for bearings to dry out and go bad. Have you
checked the actual output of the alternator? If it's good, then I'm guessing
bearings.

HTH

Ingo

On Fri, Nov 26, 2010 at 3:34 PM, Louis-Alain Richard <laraa at sympatico.ca>wrote:

> HI everyone,
>
>
>
> In my mind, an alternator is a on/off binary device : it works or it
> doesn't.
>
>
>
> Now, I have a fresh Bosch voltage regulator in an old alternator, and I'm
> not convince that this unit is working 100 %. When under load, the sound it
> makes it rather shrieking, like if there was something rubbing inside it.
>
>
>
> I do have a recent battery, but when I do charge it with a 110V charger,
> it's a lot stronger (from the sound of the starter motor) but after a few
> weeks, it drops to its "normal" level.
>
>
>
> So my question is : will a rebuilt alternator keep the battery fully
> charged
> better than the old semi-rebuilt alternator ? Besides the voltage
> regulator,
> what are the other bits that can go wrong in an alternator ?
>
>
>
> Thanks in advance,
>
>
>
> Louis-Alain
>
> 1983 Quattro with a stock 90A Bosch alternator.
>
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