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It will not actuate until the switch closes, no. And if the pressure drops and the switch opens, it will stop again. Normally it will flash the mode it is set on when the switch is open. I don't know what it might do if it's been a long time since it successfully received input pressure though...

Have you verified that the supply pressure switch is closing? It's downstream of the pressure protection valve, passenger side of the truck down low and inboard of the air tanks. Try shorting the 2 pins of the harness together and see if it does anything. Fyi at least mine is a 3 pin connector...