Zoltan,
I would hazard to guess they are just noise filters. The alternator with two
is probably newer.
Ken Lewis
http://neksiwel.20m.com/

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Hi guys,
I have an alternator here and on the back of it I have two of those
rectangular little goodies.  I guess, they are condensers, 2.2nF 100Volts,
is written on their back.
But I also have other alternators that only have one of these.
Now, I don't know how many to have on them or is there some importance of
having two instead of one.
Thanks for the List.
Zoltan