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OBJECTIVES
After studying Chapter 20, the reader should be able to:
1. Prepare for ASE Electrical/Electronic Systems (A6)
certification test content area “D” (Charging
System Diagnosis and Repair).
2. List the parts of a typical generator (alternator).
3. Describe how a generator works.
4. Explain how the voltage regulator works to control
generator (alternator) output voltage.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
PRINCIPLES OF GENERATOR OPERATION
• All vehicles operate electrical components by taking current
from the battery.
• The amount of current generated can be increased by the
following factors.
1. Increasing the speed of the conductor through the magnetic field
2. Increasing the number of conductors passing through the magnetic
field
3. Increasing the strength of the magnetic field
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ALTERNATING-CURRENT GENERATORS
(ALTERNATORS)
• An alternator (AC generator) generates an alternating
current when the current changes polarity during the
generator’s rotation.
• Most manufacturers call an AC generator a generator, but
the most commonly used term in the industry is alternator.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GENERATOR CONSTRUCTION
• An alternator is constructed of a two-piece cast-aluminum
housing.
• The rear housing, or the slip-ring end (SRE housing),
usually contains a roller-bearing support for the rotor and
mounting for the brushes, diodes, and internal voltage
regulator (if the generator is so equipped).
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GENERATOR CONSTRUCTION
FIGURE 20-1 A typical generator
(alternator) on a Chevrolet V8 engine.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
FIGURE 20-2 The end frame toward the drive
belt is called the drive-end housing and the rear
section is called the slip-ring-end housing.
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ALTERNATOR OVERRUNNING PULLEY
Purpose and Function
• Using a one-way clutch in
the alternator pulley allows
the belt to apply power to
the alternator in only one
direction thereby reducing
the fluctuations in the belt.
FIGURE 20-3 An OAP on a Jeep generator
with a diesel engine.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ALTERNATOR OVERRUNNING PULLEY
Purpose and Function
• Another type of alternator pulley uses a dampener spring
inside, plus a one-way clutch.
• This unit is called an overrunning alternator dampener
(OAD).
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ALTERNATOR OVERRUNNING PULLEY
Purpose and Function
FIGURE 20-4A An OAD on a Chrysler
vehicle generator.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
FIGURE 20-4B An overrunning alternator
dampener (OAD) disassembled, showing all of
its internal parts.
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ALTERNATOR OVERRUNNING PULLEY
Diagnosis and Service
• Overrunning alternator pulleys and overrunning alternator
dampeners can fail.
• In most cases, the entire alternator assembly will be
replaced because each OAP or OAD is unique for each
application and both require special tools to remove and
replace.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ROTORS
• At both ends of the rotor
windings are heavy-gauge
metal plates bent over the
windings with triangular
fingers called claw poles.
• These pole fingers do not
touch, but alternate or
interlace
FIGURE 20-5 A cutaway of a General Motors
CS-130D generator showing the rotor and
cooling fans that are used to force air through
the unit to remove the heat created when it is
charging the battery and supplying electrical
power for the vehicle.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ROTORS
• The magnetic fields are
created between the
alternating pole piece
fingers.
• These individual magnetic
fields produce a current by
electromagnetic induction
in the stationary stator
windings.
FIGURE 20-6 Rotor assembly of a typical alternator (AC generator).
Current through the slip rings causes the “fingers” of the rotor to
become alternating north and south magnetic poles. As the rotor
revolves, these magnetic lines of force induce a current in the stator
windings.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
STATORS
• The stator is the stationary
coil winding inside the
alternator.
• The stator is supported
between the two halves of
the generator housing and
there are three copper wire
windings wound on a
laminated metal core.
FIGURE 20-7 A cutaway view of a typical AC
generator (alternator).
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
STATORS
• As the rotor revolves, its
moving magnetic field
induces a current in the
stator windings.
FIGURE 20-8 An exploded view of a typical
generator (alternator) showing all of its
internal parts.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
DIODES
• AC generators use six diodes (one positive and one
negative set for each of the three stator windings) to
convert alternating current to direct current.
• The symbol for a diode is shown.
FIGURE 20-9 A diode symbol.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
HOW A GENERATOR WORKS
• A rotor inside a generator is
turned by a belt and drive
pulley which are turned by
the engine.
• The magnetic field of the
rotor generates a current in
the stator windings by
electromagnetic induction.
FIGURE 20-10 Magnetic lines of force cutting
across a conductor induce a voltage and current
in the conductor.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
HOW A GENERATOR WORKS
• Field current flowing through the slip rings to the rotor
creates an alternating north and south pole on the rotor, with
a magnetic field between each finger of the rotor.
• Therefore, the current generated is described as being of a
sine wave pattern.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
HOW A GENERATOR WORKS
FIGURE 20-11 Sine wave voltage curve
created by one revolution of a winding rotating
in a magnetic field.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
HOW A GENERATOR WORKS
• As the rotor continues to rotate, this sine wave current is
induced in each of the three windings of the stator.
FIGURE 20-12 When three windings (A, B, and C) are present in a stator,
the resulting current generation is represented by the three sine waves. The
voltages are 120° out of phase. The connection of the individual phases
produces a three-phase alternating voltage.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
WYE-CONNECTED STATORS
• The Y (pronounced “wye”
and generally so written)
type or star pattern is the
most commonly used
generator stator winding
connection.
FIGURE 20-13 Wye-connected stator winding.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
WYE-CONNECTED STATORS
• In a wye-type stator connection, the currents must combine
because two windings are always connected in series.
FIGURE 20-14 As the magnetic field, created in the rotor, cuts across the windings of the
stator, a current is induced. Notice that the current path includes passing through one positive
(+) diode on the way to the battery and one negative (-) diode as a complete circuit is
completed through the rectifier and stator.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
DELTA-CONNECTED STATORS
• The delta winding is
connected in a
triangular shape.
• The delta-connected
generator produces
lower current at low
speed and must be
operated at high
speed to produce its
maximum output.
FIGURE 20-15 Delta-connected stator winding.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GENERATOR OUTPUT FACTORS
• The output voltage and current of a generator depend on
several factors:
1. Speed of rotation.
2. Number of conductors.
3. Strength of the magnetic field.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GENERATOR VOLTAGE REGULATION
• An automotive generator
must be able to produce
electrical pressure (voltage)
higher than battery voltage
to charge the battery.
• After generator output
begins, the voltage
regulator controls the
current flow through the
rotor.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
FIGURE 20-17 Typical voltage regulator
voltage range.
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
BATTERY CONDITION AND CHARGING VOLTAGE
• If the automotive battery is discharged, its voltage will be
lower than the voltage of a fully charged battery.
• If a discharged battery is used during charging system
testing, tests could mistakenly indicate a defective generator
and/or voltage regulator.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
TEMPERATURE COMPENSATION
• A thermistor is used in the
electronic circuits of the
voltage regulator to control
charging voltage over a
wide range of under-the
hood temperatures.
FIGURE 20-18 A typical electronic voltage
regulator showing the connections and the
circuits involved.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
A AND B FIELD CIRCUITS
• When testing the generator,
using a bench-mounted test
unit, most test equipment
requires the technician to
select either A or B field
type.
• An A circuit is the most
commonly used.
FIGURE 20-19 Diagram of a A-type field circuit.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
A AND B FIELD CIRCUITS
• In a B-circuit field, the
voltage regulator controls
(opens and closes) the
power side of the field
circuit, and the circuit is
grounded inside the
generator.
FIGURE 20-20 Diagram of an B-type field circuit.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
ELECTRONIC VOLTAGE REGULATORS
• The electronic circuit of the voltage regulator cycles between
10 and 7,000 times per second as needed to accurately
control the field current through the rotor, and therefore
control the generator output.
• Whether mounted inside the generator or externally under
the hood, electronic voltage regulators are mounted where
normal airflow can keep the electronic components cool.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
HOW AN ELECTRONIC VOLTAGE REGULATOR
WORKS
• Depending on the
generator RPM, vehicle
electrical load, and state of
charge of the battery, this
controlled switching on and
off can occur between 10
and 7,000 times per
second.
FIGURE 20-21 Typical General Motors SI-style AC
generator with an integral voltage regulator. Voltage
present at terminal 2 is used to reverse bias the zener
diode (D2) that controls TR2. The hot brush is fed by
the ignition current (terminal 1) plus current from the
diode trio.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
COMPUTER-CONTROLLED GENERATORS
• Computers can interface with the charging system
in three ways.
1. The computer can activate the charging system by turning the field
current to the rotor on and off.
2. The computer can monitor the operation of the alternator and
increase engine speed if needed during conditions where a heavy
load is demanded by the alternator.
3. The computer can control the generator by controlling alternator
output to match the needs of the electrical system.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
COMPUTER-CONTROLLED GENERATORS
• A typical system used on
some General Motors
vehicles is called electrical
power management
(EPM).
• It uses a Hall effect sensor
attached to the negative
battery cable to measure
the current leaving and
entering the battery.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
FIGURE 20-22 A Hall-effect current sensor
attached to the negative battery cable is used as
part of the EPM system.
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
COMPUTER-CONTROLLED GENERATORS
• The engine control module (ECM) controls the alternator
by changing the on-time of the current through the rotor.
• The on-time, called duty cycle, is varied from 5% to 95%.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
COMPUTER-CONTROLLED GENERATORS
• This system has six modes of operation, including:
–
–
–
–
–
–
Charge mode.
Fuel economy mode.
Voltage reduction mode.
Start-up mode.
Battery sulfation mode.
Headlight mode.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GM CS GENERATORS
• Beginning in the mid-1980s, General Motors introduced a
smaller, yet high-output series of generators.
FIGURE 20-23 General
Motors CS generator. Notice
the use of zener diodes in the
rectifier to help control any
high-voltage surges that could
affect delicate computer
circuits. If a high-voltage surge
does occur, the zener diode(s)
will be reverse biased and the
potentially harmful voltage will
be safely conducted to
ground. Voltage must be
preset at the L terminal to
allow the generator to start
producing current.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GM CS GENERATORS
FIGURE 20-24 The components inside a GM CS generator.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GM CS GENERATORS
• The voltage regulator switches the field voltage on and off
at a fixed frequency of about 400 times per second.
FIGURE 20-25 The alternator field (rotor) current is controlled by the
computer. SMEC stands for single module engine controller.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GM CS GENERATORS
Types of Computer Controlled Charging Systems
• Computer control of the charging system has the following
advantages.
1. The computer controls the field of the generator, which can pulse it
on or off as needed for maximum efficiency, thereby saving fuel.
2. Engine idle can also be improved by turning on the generator
slowly, rather than all at once, if an electrical load is switched on,
such as the air conditioning system.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
GM CS GENERATORS
Types of Computer Controlled Charging Systems
3. Most computers can also reduce the electrical load on the
electrical system if the demand exceeds the capacity of the charging
system by reducing fan speed, shutting off rear window defoggers, or
increasing engine speed to cause the alternator to increase the
amperage output.
4. The computer can monitor the charging system and set diagnostic
trouble codes (DTCs) if a fault is detected.
5. Because the charging system is computer controlled, it can be
checked using a scan tool.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
SUMMARY
1. Generator output is increased if the speed of the
generator is increased.
2. The parts of a typical generator (alternator) include
the drive-end housing (DE), slip-ring-end (SRE)
housing, rotor assembly, stator, rectifier bridge,
brushes, and voltage regulator.
3. The magnetic field is created in the rotor.
4. The current is created in the stator windings.
5. The voltage regulator controls the current flow
through the rotor.
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
REVIEW QUESTIONS
1.
2.
3.
4.
Describe how a small electronic voltage regulator can
control the output of a typical 100 ampere generator.
List the component parts of a typical generator (alternator).
Explain how the computer is used to control a generator
(alternator).
Why do voltage regulators include temperature
compensation?
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
1. Technician A says that the diodes regulate the
generator output voltage. Technician B says that
the field current can be computer controlled.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
1. Technician A says that the diodes regulate the
generator output voltage. Technician B says that
the field current can be computer controlled.
Which technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
2. A magnetic field is created in the _____ in a
generator (AC generator).
a)
b)
c)
d)
Stator
Diodes
Rotor
Drive-end frame
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
2. A magnetic field is created in the _____ in a
generator (AC generator).
a)
b)
c)
d)
Stator
Diodes
Rotor
Drive-end frame
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
3. The voltage regulator controls the current through
_____.
a)
b)
c)
d)
The generator brushes
The rotor
The generator field
All of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
3. The voltage regulator controls the current through
_____.
a)
b)
c)
d)
The generator brushes
The rotor
The generator field
All of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
4.
Technician A says that two diodes are required for each
stator winding lead. Technician B says that diodes change
alternating current into direct current. Which technician is
correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
4.
Technician A says that two diodes are required for each
stator winding lead. Technician B says that diodes change
alternating current into direct current. Which technician is
correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
5. The generator output current is produced in the
_____.
a)
b)
c)
d)
Stator
Rotor
Brushes
Diodes (rectifier bridge)
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
5. The generator output current is produced in the
_____.
a)
b)
c)
d)
Stator
Rotor
Brushes
Diodes (rectifier bridge)
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
6. Generator brushes are constructed from _____.
a)
b)
c)
d)
Copper
Aluminum
Carbon
Silver-copper alloy
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
6. Generator brushes are constructed from _____.
a)
b)
c)
d)
Copper
Aluminum
Carbon
Silver-copper alloy
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
7. How much current flows through the generator
brushes?
a)
b)
c)
d)
All of the generator output flows through the brushes
25 to 35 A, depending on the vehicle
10 to 15 A
2 to 5 A
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
7. How much current flows through the generator
brushes?
a)
b)
c)
d)
All of the generator output flows through the brushes
25 to 35 A, depending on the vehicle
10 to 15 A
2 to 5 A
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
8. Computers can be used in charging system in
which way(s)?
a)
b)
c)
d)
Activate the charging system
Monitoring the operation of the charging system
Control the charging system
Any of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
8. Computers can be used in charging system in
which way(s)?
a)
b)
c)
d)
Activate the charging system
Monitoring the operation of the charging system
Control the charging system
Any of the above
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
9. Operating a generator (alternator) in a vehicle with
a defective battery can harm the _____.
a)
b)
c)
d)
Diodes (rectifier bridge)
Stator
Voltage regulator
Brushes
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
9. Operating a generator (alternator) in a vehicle with
a defective battery can harm the _____.
a)
b)
c)
d)
Diodes (rectifier bridge)
Stator
Voltage regulator
Brushes
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
10. Technician A says that a wye-wound stator produces more
maximum output than the same generator equipped with a
delta wound stator. Technician B says that a generator
equipped with a delta-wound stator produces more
maximum output than a wye-wound stator. Which
technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
CHAPTER QUIZ
10. Technician A says that a wye-wound stator produces more
maximum output than the same generator equipped with a
delta wound stator. Technician B says that a generator
equipped with a delta-wound stator produces more
maximum output than a wye-wound stator. Which
technician is correct?
a)
b)
c)
d)
Technician A only
Technician B only
Both Technicians A and B
Neither Technician A nor B
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458
END
Diagnosis and Troubleshooting of Automotive Electrical,
Electronic, and Computer Systems, Fifth Edition
By James D. Halderman
© 2010 Pearson Higher Education, Inc.
Pearson Prentice Hall - Upper Saddle River, NJ 07458