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Why the heater in a Vauxhall Frontera work with switch on dash although it does connected directly to battery?

The heater in a Vauxhall Frontera does not work with the switch on the dash if it is connected directly to the battery. The switch on the dash is used to control the flow of electricity to the heater fan and the heater element. If the heater is connected directly to the battery, it will operate at full power regardless of the position of the switch on the dash.