I recently bought an 804A, about 1600 hours, good clean condition, runs nice but it is not generating power, most of the time. But, on at least two start-ups it has generated good voltage, first when i first got it home two months ago, and once last weekend when we started to hook it up to put to work. I have learned that need to hold start switch longer, and have done some testing. It does send 24 volts dc out of #7 on the S-1 switch. I have adjusted the mag pickup on engine flywheel, has 3 volts there and at the control box. The under voltage fault light comes on at startup. No obvious loose connections at output box. The voltage meter on control panel shows around 25 volts, my meter on contactor in output box shows 14 v. On the occasions when it has worked it has shown 208 volts on all three legs on the panel meter.