When the pointer of the ammeter on the left 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.