I'll chime in with my past experience. I ran through about 4
generators in about 2 years. There were several issues. First,
rebuilt units were not as good as original. Second, getting the
generator belt too tight is a real issue, as the generator bearing
surface isn't that great. Third, regulators are a common failure
point (especially external regulators - which I think all generators
and the first couple or 3 years of alternators had).
As a result, I ended up eliminating my generator, and replacing it
with an alternator. Further, I fully eliminated the regulator in
doing so, as the alternator I used is internally regulated.
I know not everyone wants to make this change, but it really is the
better system to have - although not original on early cars.
Phil Bates
'67MGB with an alternator
'58 MGA with an alternator
On Tue Aug 26 21:23 , "Hans Duinhoven" sent:
I would say 50 K miles would be possible.
Point maybe, that your brushes may not be worn perhaps.
Dirt inside the brush holders might have caused, that the brush are
not
moving freely anymore and by this not making proper contact with
the rotor
of the generator.
Not charging also may have causes elsewhere like a defective or
misadjusted
regulator unit.
Cheers,
Hans
----- Original Message -----
From: "Simon Matthews" <simo n.d.matthews@gmail.com>
To: "MG List" <mgs@autox.te am.net>
Sent: Tuesday, August 26, 2008 8:07 PM
Subject: [Mgs] How many miles should a generator brush set last?
> My car (MGA with original generator/regulator) is clearly not
> charging the battery, so I need to investigate the charging
system.
>
> It may be dirty contacts in the regulator, or it may be worn out
> brushes in the generator. In order to know which to investigate
first,
> it would be useful if I knew the expected life of a set of
brushes in
> a generator.
>
> Regards,
> Simon
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