Current Output

Fig 1: Test Meter Connections for Alternator Current Output Test

With test connections made as for Charging Circuit Resistance check, move negative lead of voltmeter to a good ground, then move the positive lead of voltmeter to "BAT" terminal of alternator.
CAUTION: To avoid damage, reduce engine speed to idle immediately after starting.
Start engine and operate at idle. Adjust engine speed and carbon pile until a speed of 900 RPM (114 amp) or 1250 RPM (all others) and a voltmeter reading of 13 volts (114 amp) or 15 volts (all others) is obtained.
CAUTION: Increase in engine speed should not be high enough to allow voltage to exceed 16 volts.
Observe ammeter. Current output should be within specifications. If output is less than specified, alternator should be removed from vehicle and bench tested.