Just a follow-up on this. Last month I went to exercise the generator and it wouldn't turn over, run the fuel pump, or respond at all. Did some testing and everything checked out (voltages, good connections, starter solenoid) but I couldn't really test the control board. Since I already suspected it had issues I ordered a replacement from flightsystems.com, installed it today, and now it's working like it's supposed to again. So yes, the issue was a bad control board.
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2021 Thor Four Winds 26B on Chevy 4500
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