A simple circuit to buzz (where burning lamp is in simulator) if ignition switch is OFF and car has headlights left ON. Circuit in buzzing mode in simulator.
Top battery is taillight circuit left ON. Open switch at top to show headlamps turned OFF.
Lower battery and switch is ignition switch in OFF position. Close switch to turn ON ignition circuit.
Parts are one 150 ohm 10 watt resistor, two silicon rectifier diodes in 50 volt 3 amp range, one small 12 volt buzzer, and one PNP 35 watt transistor.
