Random Person, the scene is confusingly set by the infuriating habit of some manufacturers to refer to Alternators as "Generators".
A Turbocharger is a Supercharger but referring to one as such in a specific technical discussion is less than helpful and is often totally misleading.
Alternators (ie AC Generators) have field coils that energise the magnetic field - ie an electromagnet instead of the permanent magnet found in a DC Generator. Switch that off, no more magnet, no more wigglies. Wigglies stop, try re-energising the field coil, hence the switchery.
But then they wear their pants as an outer garment over there too, so if not confusion what can you expect?
