You may also have an internal short causing trouble, not just a dead
regulator. If the light gets brighter with higher rpm, it's not the
regulator. Happened to me just a few months after I put the new
regulator in, so I put the dud back in the old alternater when I
swapped it.
Good thing, as my "new" 300D needed one shortly after I got it.
Peter
On Feb 23, 2009, at 9:30 AM, Barry Stark wrote:
Allan -
I had these exact symptoms on my '81 SD and sure enough brushes
were worn to
a nubbins. Be advised, if you have to drive home with the
headlights you may
not make it as you will be running on the battery only so try and
get home
or to a shop before dark. Even in daylight if you have to jump it
to start
you may be driving without brake lights. Use caution. On the
positive side,
a new regulator assy. and all was well. A good thing to check
before you
spend the money on the regulator, if you can, is condition of the slip
rings. If you have a mirror and flashlight look in the hole when
you get the
regulator out. I once had an alternator that the slip rings were
really
badly worn and in that case you should probably just get a Bosch
rebuilt. I
don't recommend using a McParts rebuild if you have a choice.
Barry
-----Original Message-----
From: mercedes-boun...@okiebenz.com [mailto:mercedes-
boun...@okiebenz.com]
On Behalf Of Jim Cathey
Sent: Monday, February 23, 2009 6:43 AM
To: Mercedes Discussion List
Subject: Re: [MBZ] Alternator (and other) lamps are on
Checked the obvious -- the alternator belts are still there and don't
appear to be slipping.
The brushes are probably worn down in yours. Pull them
out and have a look. Takes a flat-blade screwdriver, does
it not? A problem with diagnosing these is that the shortening
brushes can conspire to make good contact at the doctor's office,
yet be back to it almost immediately.
-- Jim
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