A Series Diesel Engine Electrical System 142
If the lamp goes out, replace the alternator.
Abnormal Charging System Operation
Check the battery and all wiring connections.
Inspect the wiring for defects.
Check all connections for tightness and cleanliness,
including the slip connectors at the alternator and
firewall, and connections at the battery.
With ignition switch on and all wiring harness leads
connected, connect a voltmeter from:
A. Alternator “BAT” terminal to ground
B. Alternator No. 1 terminal to ground
C. Alternator No. 2 terminal to ground
A zero reading indicates an open between the
voltmeter connection and the battery.
Locate and repair the open circuit.
With all accessories turned off, connect a voltmeter
across the battery.
Operate engine at moderate speed.
If voltage is 15.5 or more, remove the alternator for
repair. The limit for 24 volt system is 25 volts.
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