Onan 12.5K low voltage
I have an Onan 12.5k from 2001 that only puts out 117V with no load. When 1 AC is on each side(~12A on both sides), the voltage stays at 117V, but 2 AC's on one side (12A on one side and ~24A on the other side) drops the voltage to 113.5V on the side with 24A. The voltage on the 12A side remains at 117V.
I have looked for an adjustment, or other similar issues, but have not found anything.
The generator starts and runs great, I changed the belt, fuel and air filters, and oil and coolant within the last year and cleaned the soot port. It is the single belt model Onan or was converted to single belt by PO. We do not use it much, it has 450 hours total on it.
Steve & Shellie
'01 Country Coach Affinity 42 #6012 Cat C12