Hi all! I have an Onan Emerald 1 BGE spec F genset. The unit starts and runs fine without hunting or surging. With no load the unit runs at 130 volts at 62Hz for about 10 minutes. Then, with still no load, (all breakers turned off) the voltage will spike to 160 and the Hz will remain at 62. The unit runs steady at this voltage for 2 to 3 minutes, then the voltage drops back to 130 at 62Hz. The unit does this the whole time its running. I have checked all of the electrical connections and wires on the control board and voltage regulator, everything "looks" fine. I have done the diode check on the voltage reg. as per the Onan service manual. All the readings were within spec. exept the 5-9 terminals which were about double(0.945) as compared to the other diodes(0.495 to 0.515). I am thinking the voltage reg. is the problem, but just wondering if anybody has had a similar problem. Any ideas on what could causing the voltage spikes would be greatly appreciated!
Thanks
Thanks