September 2005- General Aviation aircraft standard instrumentation includes an ammeter or current load meter to monitor your electrical system. Electrical power is a combination of Volts x Amps = Watts, or power.
An ammeter tells you only half of the story. In addition, the indicator charging condition is typically only a needle width difference between charge and discharge conditions.
Visual Instruments manufactures an easy to read and install voltage monitor. If your 14-volt alternator fails, the bus voltage difference between charge—13.5 volts—and discharge—12 volts or less—jumps right out in your face with changes in color and position on the voltage monitor.