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You didn't switch it with the generator running, right?

No, the double fault refers to things like both sides of the 120 volts floating (not referenced to ground with one neutral).

If the jumper from L0 to 6 were in place, you'd certainly see a dead short, zero ohms, in 120V-only mode. I *think* you'd see an open circuit if the jumper were not in place. If there were any control circuit devices trying to get power between L0 and L1, they wouldn't work in 120V mode, so I...

Well, yes, except if you do use 120v-only mode, as far as I can see, without the jumper neither side of the 120 is referenced to ground or neutral, so they're floating. This is very non-standard. It means a 2-wire device that relies on a polarized plug to keep 120 and neutral in the right...

I finally took the time to look at this jumper, L0 to terminal 6, and what it does. It appears that it simply ties L0 to L1 in the single phase mode. In both the 3-phase mode and the 120/240 single phase mode, L0 is already tied to terminal 6, so the jumper does nothing in those modes. In...