Can this Eaton T0-2-8211/E changeover switch between multiple sources
Eaton's diagram is far from clear. I suspect that it should be connected as shown in Figure 1.

Figure 1. Possible connection scheme.
I'd disconnect everything and buzz out the switch at each position to confirm rather than test it with shore and generator supplies!


Seems to me ... that #1 is 1 and 3 if you count from top left and down. That way the X in the &quot;puzzle&quot; fits with the drawing on the left, 1,3 and for #1, and 5 and 7 for #2?


Figure 2. My reading.
I read it as
         1-2     3-4     5-6     7-8
Posn1    Closed  Open    Closed  Open
Posn0    Open    Open    Open    Open
Posn2    Open    Closed  Open    Closed


And I did check the voltage on each position of the switch, e.g on pos #0 no voltage, on #2 no voltage (generator not running) and on #1 ~240VAC.

Yes but the voltage collapsed when you connected a load so that sounds to me as though you're picking up stray voltage.
Bell it out for continuity.