Originally Posted by LMhawk59
Could also be a buildup of fine dust on the stator get it blown out with high pressure air
You think dust affects magnetic fields? Any dust on the stator is blown out when the generator runs and the cooling air is blown through it. If the generator is not putting out AC voltage the controller shuts it down with an error code. The OP has a distribution problem, most likely the ATS as others have pointed out.