Charging Systems & Control Circuits Part 1
Card Set Information
Charging Systems & Control Circuits Part 1
Service Procedures Testing Diagnosis
Charging Systems, Diagnosis, Procedures & Service.
Charging System - what is it's purpose ?
to provide the electrical power required to operate the vehicle electrical components and to recharge the battery whenever necessary.
Charging Systems converts _______ energy into _______ energy ?
Mechanical Energy into Electrical Energy.
What are the 2 Stator types ?
Y-Wound Stators & Delta-Wound Stators
Y-Wound Stators - name 3 points
has a neutral junction
two windings always form a series circuit between a positive & a negative diode.
Y-Wound Stators produce more voltage at
Delta-Wound Stators - name 3 points
the windings always form 2 parallel circuit paths between a positive and 2 negative diodes
have greater current output a higher speeds but do not deliver as much current at lower
Brushes ride __________.
on the surface of the slip rings.
What is a Sine Wave ?
distinctive wave form of AC voltage produced by a passing a magnet past a conductor.
A cycle ?
is one complete sine wave - when referring to an AC voltage event.
Frequency ? 2 - Points
Measured in Hertz (Hz) events in one second
measurement of how many times an event occurs in a fixed time frame.
Alternating Current in a generator is rectified by:
The component that is turned by the generator drive belt and creates a rotating magnetic field is the:
Automotive generators w/ 3 stator windings generally us _______ diodes to rectify the output current.
Generator brushes ride on _____ to feed current to the rotors windings.
The regulator in a charging system device that controls:
Voltage levels in the charging systems.
Generator output is directly related to:
field strength & rotor speed.
Voltage Regulators (purpose)
limit voltage produced by a generator by controlling the field current in the generator rotor winding.
Most Voltage Regulators operate in the range of:
13.0V - 15.5V
What is the purpose of the Generator Output Test ?
is to determine whether the generator is capable of delivering its specified current output.
Charging Systems test are performed using: (3 answers)
a load tester
A voltage drop of more than ____ indicates high resistance in ground wiring of the charging systems.
Positive Circuit Voltage Drop Connections - where do you hook up the leads hombre ?
Connect the Voltmeter's positive lead to the generator output terminal and the voltmeter's negative lead to the positive battery terminal.
Ground Circuit Voltage Drop Connections - How are the leads hook'd up ? Hombre ?
connect the voltmeter's negative lead to the generator housing and the voltmeter's positive lead to the negative battery terminal.
If the generator drive belt tension is adjusted too tightly: (2 answers)
the belt will wear out prematurely
the generator pulley and bearings can be damaged.
A generator drive belt in poor condition and not tensioned properly will result in an:
an undercharge battery
a squealing noise after the engine is started
Duty cycle is a measurement of % of a cycle that current is flowing (on time)
What should be the first step - beginning with any electrical system repairs ?
Disconnect the negative battery.
Windings that are dark & burnt are an indication of a ________ ? (Rotor Checks)
short rotor winding.
Continuity Test ? (2 points)
Check resistance across the slip rings using an
Resistance should be between 1.5 to 4.0 ohms at
How to check Rotor for a Short-To-Ground
place the ohmmeter leads between the slip rings and rotor shafts. You should have an infinite reading - indicating no continuity to ground.
Stator Continuity Test
Using a digital ohmmeter, test for continuity between each pair of stator leads.
resistance should be less than 0.5 ohms
How to test for Opens & Internal Shorts on Delta Windings ?
Due to the design of Delta-Wound stators, they
be checked for opens & internal shorts.
Stator Ground Tests
Using a ohmmeter to check the resistance between a stator lead and the stator frame.
Ohmmeter should read infinite.
When checking rectifier diode
One side will be open & one side will have a resistance reading.
Internal Voltage Regulator
A-Type, its powered all the time & regulates on the ground side (PCM or Case Ground)
External Voltage Regulator
B-Type, its grounded all the time & regulated on the power side.
Semiconductors - definition
can conduct or block electrical current.
allow current to flow through them in one direction.
one way check valve
hav the ability to absorb & store electrical charges and then release it into the circuit
are used for electrical noise and voltage spike suppression.
Since a diode will allow current to flow in one direction and not the other, it can be used to turn AC to DC.
Allows current to flow in reveres bias at a specific voltage without damage.
allows reverse current flow above a set reverse voltage.
Not Pointing in
Acts as an electrical switch in a circuit.
The maximum current output of an alternator is regulated by:
the design of the stator winding.