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12v Automotive Electrical Voltage Indicator

12v Automotive System Voltage Indicator
When troubleshooting the 12v electrical system of an automobile, it's nice to possess an easy voltage indicator tool rather than a voltmeter. This electronic circuit, is powered by 2 AA or perhaps 2 N cells, which can offer enough energy for years of service. The circuit has solely two leads.

One lead connects to the chassis ground of the automotive. The second lead will be sharp tip probe. The circuit can indicate if an automotive electrical circuit has zero volts or 12 volts present. If the voltage is close to +12v, a inexperienced LED will activate. If the voltage is close to chassis ground a red LED will activate. If the circuit is open, neither light will light. The circuit attracts so few current in the open standby mode that no on/off switch is needed.