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Im an RV tech but not an Onan mechanic. Have worked on Onan gensets so have some experience with them.My 1993 motorhome is equiped with an Onan 7000kW genset NHM. I have a voltage meter plugged into one of the 120v outlets inside the motorhome. The engine on the genset runs very well.The problem I have is that the voltage surges slightly between 115-110 volts no load.Ive verified this with another voltage tester. Ive heard the voltage can be adjusted. Can anyone tell me if that is true and if so,how? Thank You !