Industrial 1.6L Engine Electrical 3-41
Charging System Description
The charging system consists of the following compo-
nents:
• The battery
• The generator
• The voltmeter gauge
• All related electrical wiring
The generator supplies the electrical power for charg-
ing the battery and for operating the accessories.
SI–Series Generators
All PSI 1.6L industrial engines use a Delco-Remy
Diode Rectified AC generator. Since these units have
an integral voltage regulator, they are referred to as a
System Integral Charging Unit, or “SI” for short.
The 1.6L engine uses a model 7-SI which provides the
proper current output (up to 70 amperes) to meet the
needs of various industrial applications.
A terminal marked “P” on the rear of the generator is
available to provide a speed input to the tachometer, if
needed.
The generator has an internal regulator and does not
have a diode trio. The delta stator (1), the rectifier
bridge (4), and the rotor with slip rings and brushes (3),
are electrically similar to other Delco-Remy generators.
The generator uses a conventional fan and pulley. An
internal fan cools the slip rings, the end frame, the
rectifier bridge, and the regulator. The voltmeter gauge
indicates the battery’s state of charge in DC volts when
the ignition switch is in the RUN position and the engine
is not running.
When the engine is running, the voltmeter indicates the
condition of the charging system. Indications between
the low and high warning zones represent the normal
operating range. Readings in the low warning zone may
occur when a large number of electrical accessories
are operating in the vehicle and the engine is left at an
idle for an extended period. This condition is normal
since the charging system is not able to provide full
power at engine idle.
As engine speeds are increased, this condition should
correct itself as higher engine speeds allow the charg-
ing system to create maximum power. Continuous
readings in either warning zone indicate problems if
any of the following conditions occur:
• Any abnormal charging condition
• System voltage is too high or too low
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