I’ve also a bosch (standard part number), but I was referring to the single terminal alternators. Internal, self-exciting.

Honestly though, there are so many variables that could determine why Ykobayashis new high capacity alt solved the issue.

Hopefully a few of the electrical engineers show up! In any event, I’ll continue to troubleshoot and update this thread with what I learn.

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1981 240D 4sp manual. Ivory White.