Workbook, Heavy Duty Truck Systems, 6E
Chapter Nine – Answer Key
1. What would be a typical current draw of a heavy-duty truck starter motor when cranking?
2. Before performing a test of a truck cranking circuit, which of the following must be
performed first?
3. When is an energized cranking motor capable of producing most torque?
4. When testing a cranking circuit for voltage drops, you measure a 0.5 V-DC loss across
the solenoid. Which of the following should you perform first?
5. What is the maximum acceptable voltage drop across the insulated side of a truck
cranking circuit?
6. Technician A says that an insulated cranking circuit cable that measures a 0.5 V-DC
voltage drop should be replaced. Technician B says that a 0.2 V-DC drop across starter
circuit cable connections is normal. Who is correct?
7. Which of the following is true of a series-wound starter motor?
8. Which of the following components rotates in a starter motor?
9. Which of the following correctly explains the difference between starter solenoid pull-in
and hold-in windings?
10. What type of reduction gearing is used in a high-torque, lightweight starter motor such as
a Delco-Remy 39 MT?