Alternator screeching when under load

[Aaron Jongbloedt]

You can try to loosen or tighten the tension on that belt...mine used to
squeal when cold, or wet, or alot of load, until i tightened it down more.
ALSO, does it happen when just wet?  Part of the belt/altenator is exposed
to the eliments.

Keith Lawyer wrote:

> The alt on my '90 200 screamed all the time.  I believe the pitch would
> change under load somewhat.  I'm sure it was bearings.  A new alt
> (albeit expensive Bosch) solved the problem.
>
> Keith L
>
> >>> <radek at istar.ca> 12/30/04 12:57PM >>>
> Hello group, need your help.
>
> My 88 90Q has been doing this for some time now.  When the electrical
> load increases (like
> having the
> headlights on and switching on defrost) the alternator would start
> making the most awful,
> high-pitched
> screeching noise and stop charging (voltmeter drops from 14V to 12V or
> so).  First, I
> suspected the belt
> slipping but tightening it would not solve the problem.  Next, I
> suspected high electrical
> resistance so I
> took out the alternator, removed the voltage regulator, checked the
> brushes and cleaned
> all the
> contacts.  Still no help.  Yesterday the screeeching got worse and on
> my way back from
> work the belt
> broke.
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aaron...
------
Aaron J. Jongbloedt
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Sabis Educational Systems Network Administrator
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