Electro- mechanical buzzer sounds when vehicle ignition is turned off and headlights are still on.
A six volt buzzer uses about a 10 ohm 10 watt resistor to lower voltage to power buzzer. When ignition is powered and headlights ON the relay remains in OFF state.
Open the SPST above battery on left side to switch ignition OFF. Relay releases to allow buzzer to function normally. The square wave generator is added to simulate buzzer action.
