[hypoxia]

I can only speak of my 2014. The compressors are 120 VAC with a pressure transducer to sense the pressure. it is mounted on the same block as the pressure gauge. I have not opened the Valid box to see if the transducer is connected to a relay or an electronic switch. Hopefully it's a relay. If the compressors are not starting and have 120 VAC going into the Valid control the problem must be the Valid box. Call Valid, they were helpful when I spoke with them a few years ago. If you can get them to send a schematic of the Valid control box there are probably a bunch of us that would like to see that.

Oddly enough, after your post yesterday I unplugged the pressure transducer to look at the wiring then plugged it in again. This morning the bedroom door would not open & I had to use open the isolation valve to open it. I turned the compressor off & back on and it has worked OK all day. It had not started all night and the tank was empty.

I made some drawings of my coach air system but it is not complete. I'll be at my stick house tomorrow and will have better capabilities to work on that.