Thank you all for your thoughts. (I am an idiot about these things so please bear with me.) The bus has a 24 volt alternator which charges the 12 volt bus batteries via the parallel connections. The bus batteries also have two of them which deliver 12 volts to the 12 volt system.
The magnum inverter is also a 24 volt system. With the merge switch on, the magnum inverter reads the 24 volts off the bus batteries and would invert.
The large deep cell coach batteries are all steady at just over 13 volts. The input to the inverter shows approx. 12 volts when the merger switch is off.
HUM??????
