Laser FWD L4-1997cc 2.0L DOHC Turbo (1993)
Ammeter Gauge: Description and Operation
Ammeter (Shunt Type) Operation
The ammeter is used to indicate current flow into and out of the battery. When electrical accessories in the vehicle draw more current than the
alternator can supply, current flows from the battery, and the ammeter indicates a discharge (-) condition. When vehicle electrical loads are less than
alternator output, current is available to charge the battery, and the ammeter indicates a charge (+) condition. If the battery is fully charged, the voltage
regulator reduces alternator output to meet vehicle electrical loads, and the ammeter reads zero.
The shunt type ammeter is a specially calibrated voltmeter. It reads the voltage drop across a resistance wire (shunt) between the battery and
alternator. If a discharge condition is indicated for an extended period, the battery and charging system should be checked. The shunt is located either in
the vehicle wiring or within the ammeter.
When voltage is higher at the alternator end of the shunt, the meter indicates a charge (+) condition. When voltage is higher at the battery end of the
shunt, the meter indicates a discharge (-) condition. When voltage is equal at both ends of the shunt, the meter reads zero.