'79 Super Turtle,

It is possible your car came with an external voltage regulator. As I recall the connection from the alternator to the electrical system is a small black plug and there is a loose wire that gets connected to the frame or body of the alternator with a screw. I have not done this job in a while but I believe that wire is green and comes from the same set of leads that has the black plug. To get a definitive answer I would call Phil at the Partsshop. Click on the tab at the top of the page and get the phone number. Phil is a great guy and will definitely know how to get you an answer. Good luck, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)