I obviously dont have that genset or its wiring diagram here, but the way Id expect it to be wired is as follows:
The output winding is similar to a typical household transformer with two legs L1 and L2 of 120 volts to Neutral (center point of winding) and 240 volts line to line (L1 to L2).
Now, the gensets neutral should be bonded to its case/frame/ground (if it has an iron frame???) which would cause a voltmeter to read as you expected, 120 volts line to frame or line to neutral and again, 240 line to line.
If its NOT perhaps the Neutral isnt properly bonded to the case/frame ????????? (if it has one) BUT in the event that genny is used to backfeed your home panel via a two pole transfer switch THEN THAT NEUTRAL TO CASE/FRAME BOND IS INDEED SUPPOSED TO BE SEVERED.
See if any manual speaks of neutral to case/frame (if it has any iron frame) bond and whether or not its attached????? An ohmeter cam tell ya that also. You might wanna look at its outlets wiring for any Neutral to equipment ground terminal bonds present or the ability to make such a bond there???????
Those portable gensets can be used to supply cord and plug connected equipment (i.e. via their own internal mounted receptacles) with no other bonds to any grounding electriodes such as a rod driven into mother earth ya know. But again, if you backfeed your hoise via a 2 pole x fer switch and carry the houses equipment ground conductor out to ground the gennsy iron frame, THAT NEUTRAL TO CASE/FRAME IS NOT USED/CONNECTED
John T Too long retired EE and rusty on the latest NEC so noooooooo warranty
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