Decelerator (STD cab) Position potentiometer voltage is too high
Reverse clutch is not calibrated
Aux 3rd Raise Coil solenoid shorted to 12 volts.
Low pressure switch (-) input shorted to ground
Reverse clutch is not calibrated
Partial frosting and sweating of lines combined with poor cooling, fan belt slipping, loss of refrigerant, restricted or clogged liquid line or expansion valve malfunctioning.