Low Air Pressure warning

Guys, I don't usually post. I read the forums alot and spread the info I find here. You folks are better than a shop most of the time.

I have a spare truck 2013 Cascadia. Sat for about 3 weeks. When I started it Tuesday the park brake warning came on even though set. Low air warning (buzzer and light) came on and stayed on even though at 125 Primary 130 secondary and dryer spit.

From reading forum threads I figured I would get sensors. Replaced park brake sensor and both air pressure sensors. No luck. Got test light and there is no power to either side of wire to sensors. Does someone know where the wire originates from. Red wire with white line. Let me know what I can provide to help you help me.

Any advice is greatly appreciated

Karl

Truck Specs
2013 Cascadia DD 15 10 sp Not sure if VIN will help but last 6 is BR8293 If whole vin is needed let me know. I

 

Ok, I aired it up and pumped down via foot pedal. No help. Aired it back up and drained it from tanks. Didn't help but at least I confirmed tanks are dry. Checked all fuses. Still no power to sensors. Put in another dash module to see if that might be problem. Still did same thing. I think it is a wire broke, or has been exposed and possibly ground out. But all fuses are good. Not much good at trouble shooting electrical.