Probably my explanation was not clear enough, so here I go again
the left side bulbs go to sleep when you turn the right or left hyd sys on, not the related side
As a matter of fact, its the opposite that is happening; the bulbs go off (asleep) 5 minutes after the hyd press in the respective system is <200 PSI. By switching the aux pump, transfer pump or starting an engine you will increase the pressure in the R, or the R and L hyd system,
thereby the lights will come on!
so the right side bulbs are always on.. why??
The right side bulbs are not always on. They obey to the same rules and should extinguish after 5 minutes
if the hyd pressure
is <200 PSI. If they don't extinguish the reasons may be:
A) a fault in the 200 PSI sensor
B) residual pressure in the RH hyd system
C) windmilling RH engine causing residual hyd press
D) other undescribed fault (don't have the time nor the desire to delve into the wiring diagram, plus it would cost a lot of $
)
Have fun!