I have a spec K Emerald Plus built in March '94: C943138824 It only has about 600 hours on it and runs like a brand new generator. However, I was curious and how drastic the difference was in the brightness of the lights running off the batteries vs. off the converter. It basically got somewhat intensely brighter. I eventually decided to check the voltage and its in the 140V range! I suspect it has been like this for a long time and seemingly nothing has gone bad yet. I am having trouble finding info on what regulates voltage in these units. Any guidance is appreciated. Thanks in advance.