[Vwdiesel] Update 92 ECO Diesel Alt light on

[Toms916 at aol.com]

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I tightened the belt, and the light now stays on all the time except at idle.
So I thought I would check it with a meter. At idle it is charging at 13.5
volts. When I increased Rpm's voltage dropped down under 11. I pulled the
alternator off, and removed the brush plate. One of the brushes was . 5" long
and the other was almost nonexistent. I also noticed a burnt ring of plastic,
floating on the contact ring of the stator. I take it that burnt ring is the
aft bearing retainer. Another thing I noticed the area that the brushes ride
is recessed, as if the brushes wore a track in the area. During past brush
changes I am use to seeing this area flat, with some discoloration that can
be removed with sandpaper.

So where can I go from here. I checked the local auto parts places and have
gotten prices between $195, and $256. What other VW's would have this Alt? It
says 90a, on the tag. I was going to check the local junk yard.
Thanks.