I'm no expert and cannot figure out some mysteries.
But, what else is plugged into the back bone?
I have the ray
instruments but they are backbone connected to a BG charterplotter and Horizon
vhf radio. With everything on, if I were to turn of the
vhf at the unit and then turn it on again, all my instruments (except depth) go blank.
I would need to turn everything off, then turn all on except I need to make sure the
radio turns on 1st.
A mystery, I just deal with it at this point.
My thought for you is try to separate the wind instrument from everything else, see if it works on its own.
Good luck! Greg