I have a new voltage regulator in the box, and removed my old one. Looking at the part numbers, the old one is 1 197 311 009, while the new one is 1 197 311 028.

They look identical (both are EL 14V 4C), but the old one has a resistor or something up top that the new one lacks. Also, the brushes on the new one are much longer than the old one, but that is probably due to wear.

I want to make sure this new regulator is compatible with my car so I don't mess up anything. I'm not sure what type of alternator I have, but I think maybe it is the 55AMP type, as I think this was standard on the W116 300SD.

Thanks for the help.

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1967 W110 Universal Wagon, Euro, Turbo Diesel, Tail Fins, 4 Speed Manual Column Shift, A/C
1980 W116 300SD Turbo Diesel, DB479 Walnut Brown, Sunroof, Highly Optioned, 350,000+ Miles