Workbook, Heavy Duty Truck Systems, 6E
Chapter Eight – Answer Key
1. When is a diode likely to conduct current?
2. Technician A says that the brushes on alternators carry small current loads, which means
they last a long time. Technician B says that the brushes on older generators had to
conduct the specified current load of the alternator. Who is correct?
3. How many diodes are required on a three-phase alternator diode bridge to achieve full-
wave rectification?
4. In what type of truck charging/cranking circuit would you find a transformer/rectifier?
5. Which of the following test instruments would be preferred when verifying alternator
current output?
6. Technician A says that when full-fielding an alternator in chassis, maximum battery load
should be drawn from the chassis battery banks. Technician B says that voltage spikes
can be produced whenever an alternator is full-fielded. Who is correct?
7. When you are checking alternator AC leakage, what specific alternator component is
being tested?
8. When measuring alternator AC leakage, an AC voltage value of 0.8 V-AC is produced.
What should you do?
9. When using Intelli-check on an alternator, the low battery voltage status light is
illuminated. What should you do?
10. Technician A says that most current truck alternators use a delta configuration of diodes
to achieve fullwave rectification. Technician B says that most truck alternators use solid–
state voltage regulators. Who is correct?