Oh boy - I did the same thing with my '73 220D. The radio and lights worked, but I couldn't start it. Nothing burned up, though. I caught it, corrected it and it was fine.

Alternator was OK after that I think, but it did have trouble later that I corrected by having it re-wound and using a modern solid state voltage regulator.

Chances are you didn't hurt the car too bad.

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- Greg -
1973 220D, The Prodigal Benz
1974 240D