ASE A6 Electrical Electronics Practice Test

56. A vehicle's body ground strap is burned and beginning to separate. Which of these could be the cause?

  • A. Worn starter brushes.
  • B. Resistance in the starter ground circuit.
  • C. A loose body ground connection.
  • D. A loose engine ground connection.


Answer A is wrong. Worn starter brushes result in a slow cranking starter.

Answer B is wrong. Resistance in the starter ground circuit results in a slow cranking starter.

Answer C is wrong. The body ground is of a smaller gauge and provides a ground for the vehicle's accessories.

Answer D is correct. Electricity always seeks the easiest path to ground. A loose engine ground causes excessive current to flow through smaller body ground on its way back to the battery. The excessive current will damage the thinner cable.

57. Full-fielding an alternator:

  • A. Bypasses the alternator's stator.
  • B. Produces zero voltage output.
  • C. Bypasses the alternator's voltage regulator.
  • D. Has no effect on voltage output.


Answer A is wrong. The stator produces a magnetic field in an alternator.

Answer B is wrong. Charging voltage can be regulated using an electro-mechanical, electronic, or computer-controlled regulator.

Answer C is correct. Full-fielding an alternator bypasses the voltage regulator and produces maximum output.

Answer D is wrong. The increased field current increases the magnetic field created inside the alternator.

58. The plug leading from the harness to an airbag sensor is MOST likely:

  • A. Yellow
  • B. Red
  • C. White
  • D. Black


Answer A is correct. The plug will most likely be yellow.

Answer B is wrong. The airbag module contains the airbag and the inflator assembly incorporated into a module compact enough to fit into a steering wheel, passenger dash, or the side of the front seat.

Answer C is wrong. Sensors are behind the front bumper and inside the passenger compartment.

Answer D is wrong. Yellow tape is also available for airbag systems.

Click to Enlarge.

59. There is excessive resistance at point A in the heated seat circuit above. Technician A says the two heated seat elements are part of a series circuit. Technician B says this resistance will affect both heating elements. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B


Answer A is wrong. This is a diagram of a series circuit; series circuits are different from parallel circuits. In parallel circuits, one of the components can fail without affecting the others.

Answer B is wrong. In a series circuit, an open or resistance in a wire or plug affects both elements.

Answer C is correct. Both technicians are correct.

Answer D is wrong. The module uses the signal from the NTC sensor for safety and to regulate temperatures for HI and LOW settings. Learn more about this circuit in the read more section.

Click to Enlarge.

60. With the engine running the voltage between pin 6 and ground measures 3.00 Vdc and the voltage between pin 14 and ground measures 2.00 Vdc. Technician A says this is normal. Technician B says these readings indicate crossed wires or shorted connector pins. Who is correct?

  • A. Technician A
  • B. Technician B
  • C. Both A and B
  • D. Neither A or B


Answer A is correct. The reading changes with the activity on the bus. Typically the measurement is taken from the OBD II DLC of a system without a gateway or by back-probing the CAN HI and CAN LO pins of an easy-to-access control module's connector on a system with a gateway. The signal should be above 2.5 Vdc on the CAN HI wire and below 2.5 Vdc on the CAN LO wire.

Answer B is wrong. When CAN HI shorts to CAN LO, the voltage will remain around 2.5 Vdc on both wires.

Answer C is wrong. Technician A is correct.

Answer D is wrong. Technician A is correct.