I don't pretend to know much about your problem but when I had a similar alternator problem I used this link. It might be relevant to you espically reagading the question on different alternators.

http://www.peachparts.com/shopforum/showthread.php?t=103340&referrerid=18866

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***SAMI*****
1986 300E 240K
1999 Mitsubishi Spyder GS 60K