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Ammeter:
- Ammeters are designed with the zero point in the center of the face and a negative or positive indication on either side [Figure 2]
- An ammeter is used to monitor the performance of the aircraft electrical system which shows if the alternator/generator is producing an adequate supply of electrical power
- When the pointer of the ammeter is on the plus side, it shows the charging rate of the battery
- A minus indication means more current is being drawn from the battery than is being replaced
- A full-scale minus deflection indicates a malfunction of the alternator/generator
- A full-scale positive deflection indicates a malfunction of the regulator
- In either case, consult the AFM or POH for appropriate action to be taken
- Not all aircraft are equipped with an ammeter-some have a warning light that, when lighted, indicates a discharge in the system as a generator/alternator malfunction
- Refer to the AFM or POH for appropriate action to be taken
- It also indicates whether or not the battery is receiving an electrical charge
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Loadmeter:
- The loadmeter reflects the total percentage of the load placed on the generating capacity of the electrical system by the electrical accessories and battery [Figure 2]
- When all electrical components are turned off, it reflects only the amount of charging current demanded by the battery
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