... I'd have to really think about how the field terminal on the 50DN is controlled to see if the same function exists, making the issue of throwing the switch while the alternator is charging moot,
On my bus, 12 volts is connected to the center terminal of the battery pair, along with the Vanner. Since the switch interrupts the 24 volt side, 12 volts continues to be present in the bus regardless.
What I can tell you, though, is that generally speaking, main starter cables are wired directly, and with good reason
Let me see if I understand this correctly, ALL the other companies from GM thru Prevost are wired up wrong? Somehow I find that not only unlikely but bordering on impossible to believe.
You can run a LOT of current through a switch for brief periods -- the rating on a switch is the OPERATING current, meaning how much it will make or break.
If you have a Vanner it should be connected on the battery side of any disconnect switches, not on the opposite side. And, yes, this does mean that the Vanner will be running all the time and that it's idle current will be depleting the batteries.The problem with doing it otherwise, though, is that the Vanner needs to have the ground connection be the last one made and the first one broken. Changing the connection or disconnection sequence can fry the equalizer.