headlight for 1981 Vespa Ciao

If I have a single filament headlight. Wouldn't it make sens that I would only have two wires going to my headlight. One grond and that probably black, and this purple wire would go to the middle little niple thing right? Its a europeon modle for some reason there is two spots for a grond the part where the case of the lightbulb goes and I am hopeing that someone just pluged the purple one into there too. Or baybe that spot is for if your lightbulb burns out you plug it on there or your bike won't run. I don't know

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