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'[OT]:: Likelihood of car alternator fault being du'
2020\09\08@100525 by RussellMc

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*TL;DR: If a 2001 Toyota Corolla alternator is faulty, how likely it is
that the field winding brushes have gone open circuit?*
It's reasonably likely that the alternator is the original one.
___________________

My son's 2001 Toyota Corolla has stopped charging its battery.
The battery holds charge and the alternator does not draw substantial
current when off.

Indications are that the alternator system is dead.
It seems likely that there has not been a diode short circuit as in my
experience these draw substantial battery current.

A mechanic will remove and replace the alternator at an acceptable price.
Alternator replacement is acceptable if necessary.

*Can anyone suggest how likely it is that the field winding brushes have
gone open circuit?*
For various reasons I'm not inclined to do alternator diode replacements or
other repairs but if brush failure was the cause then a repair sounds
liable to be a sensible solution.



       Russell McMahon
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2020\09\08@114847 by Bob Blick

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Hi Russell,
If the brushes have gone bad, it's quite likely that other damage has or will soon happen to the alternator. Since it's a closed loop system, the regulator is going to try to maintain current, so there might be arcing and excess heat which can damage the slip rings and potentially the regulator itself. Not saying that's what's happening here, but just fyi. The damage to the slip rings isn't going to be as bad as what happens in a motor with a slotted commutator, you can probably clean it up good enough to get a few more years before the new brush is gobbled up.
Cheers, Bob

________________________________________
From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu <.....piclist-bouncesKILLspamspam@spam@mit.edu> on behalf of RussellMc Sent: Tuesday, September 8, 2020 7:03 AM
To: Microcontroller discussion list - Public.
Subject: [OT]:: Likelihood of car alternator fault being due to worn field      winding brushes?

*TL;DR: If a 2001 Toyota Corolla alternator is faulty, how likely it is
that the field winding brushes have gone open circuit?*
It's reasonably likely that the alternator is the original one.
___________________

My son's 2001 Toyota Corolla has stopped charging its battery.
The battery holds charge and the alternator does not draw substantial
current when off.

Indications are that the alternator system is dead.
It seems likely that there has not been a diode short circuit as in my
experience these draw substantial battery current.

A mechanic will remove and replace the alternator at an acceptable price.
Alternator replacement is acceptable if necessary.

*Can anyone suggest how likely it is that the field winding brushes have
gone open circuit?*
For various reasons I'm not inclined to do alternator diode replacements or
other repairs but if brush failure was the cause then a repair sounds
liable to be a sensible solution.



       Russell McMahon
--


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2020\09\08@123432 by John Lawton

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Sounds like a clear case for fitting a reconditioned unit.

John

On 08/09/2020 16:48, Bob Blick wrote:
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2020\09\08@155708 by Alan Pearce

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I would agree. A reconditioned unit will (should) also have its
bearings replaced, which will probably be required after almost 20
years.

On Tue, 8 Sep 2020 at 17:34, John Lawton <EraseMEpiclistspam_OUTspamTakeThisOuTjle.co.uk> wrote:
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2020\09\08@180122 by Richard Prosser

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In my (limited) experience, diode failures are far more common than worn
out brushes on the sliprings. It's not like a commutator, there is a smooth
surface for them to run on without switching so wear is minimal. Probably
there is a fuse or fusible link somewhere to protect things if (when) a
diode goes short circuit.
RP

On Wed, 9 Sep 2020 at 07:58, Alan Pearce <KILLspamkiwiantipodeanKILLspamspamgooglemail.com>
wrote:

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