Diesel generator intermittently producing 117V and 104V at irregular intervals
Before I haul my generator off to a repair facility I thought I'd see if anyone can give me a clue what might be going on. It's a Marathon pancake head driven by an Isuzu 3LB1 engine producing a nominal 10 kW. For awhile the generator will produce 117-120V then for awhile it produces ~104V, changing back and forth at irregular intervals (not a high speed fluctuation; minutes to an hour or more). The change does not seem to be related to heat or load and it does not seem to produce intermediate voltages. The Outback inverter charger produces about 4.6 kW when fed the higher voltage and 4.2 kW at the lower voltage, which seems to make sense. The genset has about 1,000 hours on it. I'd very much appreciate any thoughts on this.
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