Well without any more info than I already had, I started by going back to the basics and checking fuses with the meter. Before I could do THAT, I had to translate the legend on the fuse cover to English from German (thank goodness for the internet).
All but 1 of my problems wound up being fuse related. BTW, the parklamps, low beams, and high beams have left and right side fuses. Corrosion was the culprit with my lighting and horn problems, now I just have to get into my dash lights then it's all mechanical.

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1972 350sl (European)