Chevrolet Light Duty Truck 1973, Service Manual

Page: 545 / 979

E N G I N E E L E C T R IC A L 6 Y - 1 7
THE CHARGING SYSTEM
10-SI SERIES DELCOTRON SYSTEM
INDEX
General Description........................................................ 6Y-17
Theory of Operation....................................................... 6Y-17
Service Operations........................................................... 6Y -19
Delcotron Replacement................................................. 6Y -19
Pulley Replacement....................................................... 6Y-19
Diagnosis............................................................................. 6Y-21
Static Checks.....................................................................6Y-21
Indicator Lamp Circuit Check...................................6Y-21
Undercharged Energizer Condition..........................6Y-22
Overcharged Energizer Condition.............................6Y-23
Generator Output Test..................................................6Y-23
Other Harness Checks....................................................6Y-24
GENERAL DESCRIPTION
The 10-SI series Delcotron generator shown in Figure 1C
is typical of a variety of models. A solid state regulator
having an integrated circuit is built into the end frame.
Although models are available with different outputs at
idle and different maximum outputs, their basic
operating principles are the same.
The Delcotron generator consists primarily of two end
frame assemblies, a rotor assembly and a stator
assembly. A typical cross-sectional view is shown in
Figure 1C. The rotor assembly is supported in the drive
end frame by a ball bearing and in the slip ring end
frame by a roller bearing. These rotor bearings contain a
supply of lubricant sufficiently adequate to eliminate the
need for periodic lubrication. Two brushes carry current
through the two slip rings to the field coil mounted on
the rotor and under normal conditions will provide long
periods of attention - free service. No periodic
adjustments or maintenance are required on the
generator assembly.
The stator windings are assembled on the inside of a
laminated core that forms part of the generator frame. A
rectifier bridge connected to the stator windings contains
six diodes, (three positive and three negative) molded
into an assembly which is connected to the stator
windings. This rectifier bridge changes the stator a.c.
voltages to d.c. voltage which appears at the output
terminal. The blocking action of the diodes prevent
battery discharge back through the Delcotron generator.
Fig. 1C—10-SI Series Delcotron
LIGHT DUTY TRUCK SERVICE MANUAL