Probably not as there is no overhead switch on the bus - well, pack hi flow is, of course. There is combined crank/norm/ignition-or-start switch on the central pedestal and it is not spring loaded in any way.
Unlike some machinery I am more familiar with - with a Start switch that is sometimes solenoid held for a bit. The overhead reference was also my attempt at some small (perhaps very) humor.
Variety must surely be the spice of life - and I do need to get around a bit more.