On the back of my original equipement Bosch alternator is a small rectangular box, with one wire coming out of it, that attaches to a terminal. The other end is held to the back of the alternator with one Phillips head screw.

What is the name of this part, and can it be purchased anywhere?

Thanks!!
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If it needs to be maintained, repaired or replaced on a 1990 240, I've probably done it. '90 240DL, 315,960 miles, will she make it to 400K ?? >>You haven't really worked on a car until you draw blood<< :-}