fgdata/Aircraft/c172p/Systems/electrical.xml

<?xml version="1.0" encoding="UTF-8"?>

<PropertyList>

    <filter>
        <type>gain</type>
        <gain>100.0</gain>
        <input>
            <property>/systems/electrical/battery-charge-percent</property> <!-- this property ranges from 0.0 to 1.0 despite its name -->
        </input>
        <output>
            <property>/systems/electrical/battery-charge-percent-100</property>
        </output>
    </filter>
    
    <logic>
        <name>Low Voltage LED</name>
        <input>
            <and>
                <greater-than>
                    <property>systems/electrical/volts</property>
                    <value>0.0</value>
                </greater-than>
                <less-than>
                    <property>systems/electrical/amps</property>
                    <value>0.0</value>
                </less-than>
                
            </and>
        </input>
        <output>
            <property>/instrumentation/low-voltage-led</property>
        </output>
    </logic>

</PropertyList>