TM 5-3805-261-34CHARGING SYSTEM MAINTENANCE.4-5.Alternator(Bosch).(Sheet 7 of 12)TESTING2.Discharge capacitor (12) ground .3.Set up alternator on test bench connectingvoltmeter, ammeter, battery and carbon pile(Figure 4-30).4.Test regulator (17, Figure 4-29) onalternator.CAUTIONObserve correct polarity when connecting voltmeter.Damage to vehicle may result if you fail to follow thisprocedure.5.Set load current to 7 amps by adjusting carbonpile at a test speed of 5000 rpm. If after oneminute, voltage does not read between 26.5volts and 28.5 volts, replace regulator (17).6.Test field coil (24) for opens or shorts. Removalof only regulator (17) is necessary. Connectohmmeter to two wire assemblies of field coil(24). Replace field coil (24) if test s not 7 to 9ohms.7.Test field coil (24) for shorts to frame. Connectohmmeter to the (B-) terminal and then to eachof the two field coil (24) wire assemblies. Ifreadings are not high, field coil (24) is shorting toframe and replacement is necessary.Figure 4-30.Go to Sheet 84-29
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