ok, the genset is hooked up using a 8-4 rubber covered cord. (it is a manual hookup, not an auto start). there is a ground rod at the box. (it is located in a outbuilding) I do not have a separate one wire ground for the genset. I could try running another ground wire. Also, my house has a ground rod for the service entrance. Could you explain what you mean by an interaction between the voltage reg and the ac powered elec assy? I can tell you i understand how these contol boards sense flame. Also, if the generator output is not a pure sine wave, then what?