# Charging Systems & Control Circuits Part 1

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1. 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.
2. Charging Systems converts _______ energy into _______ energy ?
Mechanical Energy into Electrical Energy.
3. What are the 2 Stator types ?
Y-Wound Stators & Delta-Wound Stators
4. 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 lower generator speeds.
5. Delta-Wound Stators - name 3 points
• has NO neutral junction
• 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 speeds
6. Brushes ride __________.
on the surface of the slip rings.
7. What is a Sine Wave ?
distinctive wave form of AC voltage produced by a passing a magnet past a conductor.
8. A cycle ?
is one complete sine wave - when referring to an AC voltage event.
9. Frequency ? 2 - Points
• Measured in Hertz (Hz) events in one second
• measurement of how many times an event occurs in a fixed time frame.
10. Alternating Current in a generator is rectified by:
diodes.
11. The component that is turned by the generator drive belt and creates a rotating magnetic field is the:
Rotor
12. Automotive generators w/ 3 stator windings generally us _______ diodes to rectify the output current.
6
13. Generator brushes ride on _____ to feed current to the rotors windings.
Slip Rings.
14. The regulator in a charging system device that controls:
Voltage levels in the charging systems.
15. Generator output is directly related to:
field strength & rotor speed.
16. Voltage Regulators (purpose)
limit voltage produced by a generator by controlling the field current in the generator rotor winding.
17. Most Voltage Regulators operate in the range of:
13.0V - 15.5V
18. What is the purpose of the Generator Output Test ?
is to determine whether the generator is capable of delivering its specified current output.
19. Charging Systems test are performed using: (3 answers)
• a multimeter
• an oscilloscope
20. A voltage drop of more than ____ indicates high resistance in ground wiring of the charging systems.
0.2V
21. 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.
22. 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.
23. 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.
24. 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
25. Duty Cycle
Duty cycle is a measurement of % of a cycle that current is flowing (on time)
26. What should be the first step - beginning with any electrical system repairs ?
Disconnect the negative battery.
27. Windings that are dark & burnt are an indication of a ________ ? (Rotor Checks)
short rotor winding.
28. Continuity Test ? (2 points)
• Check resistance across the slip rings using an ohmmeter.
• Resistance should be between 1.5 to 4.0 ohms at room temperature
29. 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.
30. Stator Continuity Test
• Using a digital ohmmeter, test for continuity between each pair of stator leads.
• maximum resistance should be less than 0.5 ohms
31. How to test for Opens & Internal Shorts on Delta Windings ?
Due to the design of Delta-Wound stators, they cannot be checked for opens & internal shorts.
32. Stator Ground Tests
• Using a ohmmeter to check the resistance between a stator lead and the stator frame.
33. When checking rectifier diode
One side will be open & one side will have a resistance reading.
34. Internal Voltage Regulator
A-Type, its powered all the time & regulates on the ground side (PCM or Case Ground)
35. External Voltage Regulator
B-Type, its grounded all the time & regulated on the power side.
36. Semiconductors - definition
can conduct or block electrical current.
37. Diodes
allow current to flow through them in one direction.

one way check valve
38. Capacitors
• hav the ability to absorb & store electrical charges and then release it into the circuit
• are used for electrical noise and voltage spike suppression.
39. Rectification
Since a diode will allow current to flow in one direction and not the other, it can be used to turn AC to DC.
40. Zener Diode
• Allows current to flow in reveres bias at a specific voltage without damage.
• allows reverse current flow above a set reverse voltage.
41. Anode
Positive
42. Cathode
Negative
43. NPN
Not Pointing in
44. PNP
Pointing IN
45. Transistors
Acts as an electrical switch in a circuit.
46. The maximum current output of an alternator is regulated by:
the design of the stator winding.
 Author: Ordonez ID: 299056 Card Set: Charging Systems & Control Circuits Part 1 Updated: 2015-03-25 05:56:59 Tags: Service Procedures Testing Diagnosis Folders: Description: Charging Systems, Diagnosis, Procedures & Service. Show Answers: