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The charging source comes from the vehicle's alternator actually and not from the battery as the charging circuits are independent. That's why modern vehicles require a dedicated towing wiring loom rather than the basic connections because the vehicles computer detects a secondary battery and will increase the charge output accordingly to charge both the car and caravan battery when the engine is running. Modern vehicles have a can-bus system which the computer sends and receives messages in milliseconds and reacts to any changes within the electric system therefore when the towing plug is disconnected this is then registered with the vehicles onboard computer, eliminates the extra charge required and resets the charge back to default.
Regarding the switch, there should a CAR/VAN switch which needs to be on CAR when plugged in and towing, switched to neutral prior to removing the towing plug then switched to VAN afterwards to receive power from the leisure battery.
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Topic: Charging Caravan Battery
