GMC 4000 Series Service Manual page 422

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The alternating current generator is used as standard and optional
equipment on all vehicles covered by this manual.
Refer to "Model Application Chart" below and "Specifications" at
end of this section. This section is divided into sub-sections listed in
the Index following:
Subject
Model Application Chart
Generating System General D e s c r ip tio n .......................................
On-Vehicle Maintenance, Tests, and A d ju s tm e n ts ..................
Two-Unit Type Regulator
Model 1119507 or 1119515
F u ll T r a n s isto r Type R egulator
Model 1116374 or 1116378
Charging System Trouble Analysis Chart
S p e c ific a tio n s.........................................................................................
AMPERAGE TRUCK SERIES
STD. 42-AMP - LA/LV-4000; PS-4500 .......................................................
STD. 42-AMP - DLA/DLV-4000; EM/ES-4500 ........................................
STD. 42-AMP - EG/EM/ES-5500; EG/EM-6500 .....................................
STD. 61-AMP - SG/SM/SS-5500; SM-6500
OPT. 61-AMP - LA/LV-4000
OPT. 61-AMP - DLA/DLV-4000; EM/ES-4500 ........................................
OPT. 61-AMP - EG/EM/ES-5500; EG/EM-6500 .....................................
OPT. 62-AMP - DLA/DLV-4000
OPT. 62-AMP - LA/LV-4000
OPT. 130-AMP - SG/SM/SS-5500; SM-6500
GENERATING SYSTEM GENERAL DESCRIPTION
The basic charging system components include
the battery, the self-rectifying alternating current
generator, the regulator, and interconnecting wiring
An indicator lamp (tell-tale) which indicates
only whether or not the generator is charging, or
an ammeter is used on all vehicles covered by this
manual. A voltmeter is available as optional equip­
ment.
A typical generating system used on vehicles
equipped with the two-unit type regulator is schem­
atically illustrated in figure 1, and a typical gen­
erating system used on vehicles equipped with the
full-transistor type regulator is schematically
illustrated in figure 2.
The alternating current type generator is used
as standard and optional equipment on all vehicles
covered by this manual. All units are self-rectify­
ing, alternating current (A.C.) type with direct
current (D.C.) output.
G M C S E R V I C E M A N U A L
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MODEL APPLICATION CHART
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attached to a drive pulley or by blades attached to
each end of the rotor assem bly.
two major parts, a stator and a rotor. The stator
is composed of a large number of windings assem ­
bled on the inside of a laminated core which is
attached to the generator frame. The rotor revolves
within the stator on bearings in each end frame.
Two brushes are required to carry current through
the two slip rings to the field coils wound concen­
tric with the rotor shaft.
rent output and type of voltage regulation, the oper­
ating principles are sim ilar.
converts mechanical energy to electrical power.
The alternating current produced within the gen­
erator is rectified by six diodes installed in the
Page No.
411
411
414
421
422
.................................... 428
430
GENERATOR
1100842
1100842
1100842
1100849
1100849
1100849
1100849
1117754
1117754
1117128
The generators are air-cooled by a single fan
The alternating current generator consists of
Although generators vary with respect to cur­
The generator is driven from the engine and
Sec. 6Y
Page 411
USE WITH
REGULATOR
1119515
1119507
1119507
1119507
1119515
1119507
1119507
1116374
1116378
1119507