Deck 31: Charging System Service

Question 1

7)All of the following statements are true EXCEPT:

A) after the engine starts, the control module or voltage regulator will energize the AC generator field and keep voltage at a predetermined level for about 30 seconds.
B) a defective electronic voltage regulator or computer is not a typical cause of a low charge problem.
C) the speed of an AC generator determines its output.
D) at idle, an AC generator is not capable of making maximum output.

Answer 1

B

Question 2

2)A hot AC generator loses 75% of its rated output.

Answer 2

False

Question 3

4)When there is excessive AC output coming from an AC generator, a car radio sometimes makes a whining sound like a siren.

Answer 3

True

Question 4

8)The test MOST-Likely used to eliminate voltage regulation and fully energize the rotor is the:

A) charging system output test
B) circuit resistance test
C) voltage test
D) full-field test

Question 5

13)Which of the following is LEAST-Likely to cause you to replace a rotor?

A) A reading below specs indicates a shorted rotor.
B) High resistance mean connections are corroded.
C) The continuity of the rotor winding does not have any opens, shorts, or grounds.
D) Infinite resistance means the rotor is open.

Question 6

5)Extra resistance in the regulator circuit will cause the battery to have a lower than normal charging voltage.

Question 7

11)The tool MOST-Likely used to look at AC generator patterns is a(n):

A) alternator
B) lab scope
C) diode
D) regulator

Question 8

18)____________________ tests check for excessive resistance in the ground and insulated circuits by measuring voltage drop.

Question 9

6)While having a discussion, Technician A says that if you replace a battery simply because it is old, this will not solve a charging problem caused by something else. Technician B says that a new battery is the only solution. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 10

1)AC generator ground wires are usually braided ground straps. The condition of these wires is as important as the insulated wires because they carry the same current flow.

Question 11

17)The ____________________ test checks to see that the voltage regulator is energizing the rotor field and is not allowing the AC generator to overcharge.

Question 12

12)Which of the following statements is LEAST-Likely true?

A) Checking voltage drops as a preventive maintenance measure will catch potential problems before they fully develop.
B) A small amount of voltage drop through the fuse link, which is a smaller wire than the rest of the circuit, is normal.
C) There are no fuse links in the ground circuit, so lower voltage drop (0.1 volt) is desired.
D) When performing a voltage drop test, remember that current must not be running through the circuit.

Question 13

10)All of the following statements are true EXCEPT:

A) diodes must be in good condition if the AC generator is to function correctly.
B) one or more leaking diodes will decrease generator output.
C) if more than 0.2 AC volt is found in the B+ output, defective diodes are indicated.
D) diodes prevent AC from leaving the AC generator in the B+ output wire.

Question 14

16)The ____________________ test loads the charging system and measures its current output.

Question 15

14)Bad ____ are a common cause of AC generator charging problems.

A) diodes
B) ohmmeters
C) ferrules
D) rotors

Question 16

3)Resistance on the ground side of a regulator will raise system voltage by the amount of the voltage drop caused by the resistance.

Question 17

9)While having a discussion, Technician A says that the A-circuit has the regulator in the ground circuit and is the type used most often with electronic systems. Technician B says that it is the B-circuit that is configured that way. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B

Question 18

20)A good ____________________ will show high resistance in one direction and low resistance in the opposite direction.

Question 19

19)A(n) ____________________ regulator has its regulator between the positive feed (insulated side) and the field coil, which is grounded inside of the AC generator.

Question 20

15)A shorted ____ will have low readings in both directions.

A) diode
B) ohmmeter
C) ferrule
D) rotor

Question 21

25)What precautions should you take when performing an alternator test?

Question 22

24)What test would you perform to determine if an AC generator field is strong?

Question 23

23)What possible problems can be caused by a loose drive belt?

Question 24

21)List four charging system complaints.

Question 25

22)What are the steps involved in testing the charging system?