Current Output

With test connections made as for "Charging Circuit Resistance", move negative lead of voltmeter to a good ground, then move the positive lead of voltmeter to "BAT" terminal of alternator. Start engine and operate at idle.
CAUTION: To avoid damage, reduce engine speed to idle immediately after starting.
Adjust engine speed and carbon pile until a speed of 900 RPM (100 amp.) or 1250 RPM (all others) and a voltmeter reading of 13 volts (100 amp.) or 15 volts (all others) is obtained.
CAUTION: Increases in engine speed should not be large enough to allow voltage to exceed 16 volts.

Observe ammeter, current output should be within specifications. If output is less than specified, remove the alternator from the vehicle and bench test it.

Fig 1: Charging Circuit Service Diagnosis Guide For All Chrysler Corp. Models
Courtesy of CHRYSLER GROUP, LLC