Nomad 2 question

Make sure that 12v adapter is plugged in correctly and secure into the unit then connect the + red battery terminal then the black - negative be sure both air and moisture bleed screws are snug. Did you try power off then bleed out all pressure then disconnect then reconnect everything including power adapter and 12v battery? Have you ever did a NO-NO by trying to restart to boost more pressure while it was still under pressure? Yo!
 
Start the compressor first then start the motor. you won’t get that working until the compressor shuts off, then you’ll get it , so just turn the car off. The system doesn’t like the alternators output voltage, but mine didn’t complain while it was running.

Oh, I always start the nomad with the second bleed valve open to reduce the load on the motor!

Ignore the useless smart comments That serve no purpose.