Do you need to turn the power switch off before steam cleaning a diesel bus engine ?

Question

Is there a safety risk to leaving the power knife switch on while steam cleaning the bus engine compartment ?

Answer 1

RVT's from 97 and Up Has electronic control modules ,so be careful.
shut the knife switch off and after steam cleaning let it rest for a while.
in case the engine does not start, wait more time for drying out,it will.
Just do not desperate.( and burn the starter trying up.)

Answer 2

It would be a good idea to shut it off.I have a mci d series and shut the power off on mine when cleaning.