Winnebago has an AUX switch and solenoid that lets the alternator charge both the engine battery and the house batteries and a battery disconnect switch and solenoid that lets you disconnect the house batteries.
You can download diagrams HERE
This is a representative diagram:
This is one I drew that shows the battery disconnect switch and solenoid wiring on one page instead of two.
The wire number may be different but the wiring should be similar since Winnebago doesn't change it much if any between models.