All Vespa brake light switches are operated when installed. This means that the pedal already presses on the spring-loaded actuating pin when not in use. Therefore we always name the function of the switches the same way they work when installed.
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If you hold the switch loosely in your hand, however, the circuit diagram is exactly the other way round than we have specified.
When converting to an electronic 12V ignition, a brake light switch type "normally open" is always required.
(US)
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