Alternators in HD Vehicles Quiz

What is the purpose of alternators using remote sense technology in HD vehicles?

• It changes the alternator set-point voltage to ensure the batteries are charged at an optimal rate.

• It increases charging voltage when the alternator and batteries are cold.

• It enables a vehicle's electrical control module to change the set-point voltage.

• It enables each battery in a battery bank to receive an identical charge voltage.

Technician A says that a voltage drop of 0.75 volt was measured in the positive lead of the alternator cable and requires a cable replacement with a larger diameter cable. Technician B says the voltage drop is acceptable because the alternator charging voltage provided to the batteries is 14.1 volts. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

What effect does increasing the flow of electric current through the rotor winding have on the charging system?

• It increases only output amperage.

• It increases only set-point voltage.

• It increases the strength of the rotor's magnetic field.

• It increases charging system voltage.

Technician A says that a charging voltage of 16.0 volts for a few minutes after an engine starts on cold mornings is normal. Technician B says that a charging voltage of 16.0 volts for a few minutes is likely caused by a poor ground or defective voltage regulator. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Which of the following conditions is caused by a shorted diode in the rectifier bridge of an alternator?

• Parasitic drain of battery charge

• Overcharging of the batteries

• Burned out light bulbs and damaged LED lights

• Burned alternator cable wiring

Technician A says that the reason the batteries of a delivery truck with an electric tailgate are undercharged is due to excessive current drawn by the tailgate. Technician B says that the problem could be corrected by adding a remote sense wire to connect the alternator and batteries. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

Technician A found a 300-amp alternator of a late-model truck stopped charging during a charging system output test and said the alternator was defective. After loading the alternator to 225 amps, he said it would no longer charge until the engine was shut off and restarted. Technician B says that was normal and recommended loading the alternator to no more than 210 amps and measuring the charging voltage at that load. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B

How many diodes are required to rectify one complete phase of stator AC output into DC?

• One

• Two

• Four

• Six

If a voltage regulator can adjust its set-point voltage according to temperature, which of the following is correct?

• The charging voltage increases as temperature decreases.

• The charging voltage decreases as temperature decreases.

• The charging voltage increases as temperature increases.

• The charging voltage remains constant, regardless of temperature changes.

Technician A says that an alternator belt used on today's engines needs to be checked for wear using a belt gauge tool. Technician B says that an alternator belt on a late-model vehicle needs to be checked for cracks and missing chunks. Who is correct?

• Technician A

• Technician B

• Both Technician A and Technician B

• Neither Technician A nor Technician B