buster MAGNUM PRO Handbuch Seite 114

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The circuit is live when the key is turned clockwise. The circuit is dead when the
switch is in the vertical position. Depending on the model, the switch may also have
the symbols 0 = off and I = on. The automatic bilge pump is always operational
when a battery is connected to the circuit.
The arrangement of electrical equipment is shown in Figure 3.