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Any idea of what the switch looks like?
Same as this?https://www.ebay.com/itm/234573619151?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=FCBArDntTtm&sssrc=2349624&ssuid=W4Rosr9IQ7K&var=&widget_ver=artemis&media=COPYIf not, maybe contact that seller.-AJ
Looks to me like the switch needs to have normally closed (NC) contacts with one terminal being grounded and the other having both the wire to the coil and the wire to the bulb connected to it.In normal operation the current passes through the NC contacts directly to ground. When the brake is operated the contacts open and the current no longer flows through the switch but has to reach ground via the stop lamp bulb.Don't think you need a switch with an integrated ground connection just the right contact type (NC or operate to open) and a link from one terminal to ground.Don't you love obscure italian engines, it took me ages to understand the generator wiring on my Italjet.
What a bizarre way to wire a brake light.
This is the also the same way that vintage Vespas without batteries operate. The switch is normally closed (NC),and opens when actuated. As long as the rear brake light bulb and its wiring remain uninterrupted, the system works. If you can find a way to attach this Vespa switch below, it would work:https://www.scootermercato.com/Scooter-Parts/Switches/55316I consider this set up simply elegant and easy to troubleshoot. These wiring systems of that era had no voltage regulators; the voltage regulation was achieved by keeping a proper electrical load provided that all bulbs worked. Their total combined resistance provided the necessary regulation. We are only talking about a max of 30-35 watts produced by the stator coils.