Portable Generator open ground

enblethen wrote:
Genset is not an inverter style so the neutral should be tied inside.
I would start over with nothing plugged into genset and verify it is wired correctly.
Also be aware the 30 amp receptacle could be 240 volt!!! That is according to reading but genset is marked 120 RV.
Something is definitely wrong with specs!

Tied inside makes sense, but what I meant was that the 20A receptacles selected one of the output legs as neutral and the 30A receptacle selected the opposite one. Since it is unbonded neutral vs hot is arbitrarily but once one of them hits a receptacle it isn’t anymore.

Check for continuity between the upper left pins on the 20A receptacles and the lower right one on the 30A. If they are not connected the genset is wired wrong and I would fix it.

I’m guessing there are pairs of like colored wires that just get connected to the receptacles without regard for hot/neutral.