there is no relay upstream. the master switch runs back to the skinner valve and is fed through the normally closed side. the relay opens to shut down the skinner valve if the auto shut down is activated. power is fed to the skinner valve to keep the bus running. power is removed to shut down. if it wont shut down pull the wire on the skinner valve. if it shuts down it is in the wiring. if it keeps running the skinner valve is stuck or the the air valve is stuck. I will be around the house working on mine tommorrow (wendsday) if you need more help just call.
It does shut down when I pull the wire off of the actual skinner valve.
It also shuts down when I pull the relay out of it's socket.
It will not shut down when I flip the master switch. Side note to this, the Master switch is not broken internally as i have removed the instrument panel and the wire has been removed to verify that this switch is not in the "locked ON" position.
I assumed that the skinner relay must have had a "pilot" relay upstream since I thought that the "master" switch could not handle ALL the power that might be required to keep the bus functioning. I guess that it handles a smaller load than I had imagined.