Bank1 is the engine battery(interstate), bank2 is house (2 - 6 volt trojans). And again bank2 behaves normally when charging but bank1 never drops below 14 volts?? Fyi my 1-2-both switch is on bank2 so theoretically bank1 should not be discharging at all.
Oh, its a 2 bank Guest 2611 10 amp charger.
I guess the charger is fried?