OK heres one for all you electrical wizards.
The two diagrams below are:

FIRST-the way prevost has the 4-12 volt batterys wired for 24 volt for the bus.

SECOND-the way the converter has the 4-12 volt batteries wired for 24 volt for the house.
My Bus 273.jpg
As you can see they aint the same, guess there is more than 1 way to achive 24 volt out of 4-12 volt batteries.

Another curious thing I've noticed. Our house voltage meters for 12volt and 24volt read 12.9 and 25.5 respectivly.

When I start the bus but before throwing the equalizer switch they go up to 13.1 and 26.9.

When the equalizer switch is turned on, with the bus running, they go up again to 13.6 and 27.1.

Why do they go up after the bus is started but before the equalizer is turned on?