A Series Diesel Engine Electrical System 140
Alternator
The terminals on the alternator are shown in this
illustration. The “R” terminal provides one-half system
voltage and is used to operate accessories such as
the tachometer on generator sets.
Trouble with the charging system may be indicated by
the indicator lamp or ammeter.
Abnormal Indicator Lamp Operation
Check the indicator lamp for normal operation as
shown below.
Engine Switch Lamp Ammeter
Stopped Off Off 0
Stopped On On -
Running On On +
Switch Off, Lamp On, Engine Stopped
Disconnect the lamp lead at the ignition switch. If the
lamp stays on, there is a short to a positive wire on the
ignition side of the lamp.
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