Decelerator or Hand Throttle (STD cab) Position potentiometer voltage is too high
Mid range clutch is not calibrated
Aux 3rd Lower Coil solenoid shorted to 12 volts.
Low pressure switch (+) input shorted to ground
Foot Throttle Position potentiometer voltage is too high (engine controller pin B30)
Mid range clutch is not calibrated
If Air conditioning does not work,possible causes are blown fuse, faulty wiring or loose connections, fxan belt loose or slipping or defective switch or defective compressor clutch.