While in flight in a single engine piston powered airplane that is equipped with an alternator, you notice that the ammeter is showing a discharge condition. On further investigation, you note that the battery voltage is below 12 volts. You start eliminating loads, so you turn off all of your avionics except one of the communications radios. You continue to turn off all of the lights that aren't absolutely necessary. As you shed loads, you notice that the volt meter shows an increase in voltage and the ammeter is starting to show a charge. You suspect that the alternator is not functioning properly. What is the most likely problem with the alternator? Group of answer choices A failed set of brushes A failing bearing A failed diode in the rectifier unit No answer text provided