When connected to the battery positive lead, what does an ammeter/loadmeter indicate?

An ammeter/loadmeter, when connected to the battery positive lead, indicates whether the battery is charging or discharging. This is essential for monitoring the health and status of the aircraft’s electrical system.

When the engine is running and the alternator or generator is supplying more current than is being drawn by the electrical system, the ammeter will show a positive reading, indicating that the battery is being charged. Conversely, if the electrical load exceeds what the engine's generator can supply, the ammeter will display a negative reading, signifying that the battery is discharging to meet the electrical demand.

This real-time feedback is crucial for ensuring that all electrical components function properly and that the battery maintains its charge, helping to prevent situations that could lead to electrical system failures during flight.