Automotive Electrical systems lab quiz 7 with correct answers 2025/2026

Automotive Electrical
systems lab quiz 7 with
correct answers
2025/2026




A lab scope is used to measure the output voltage of an alternator. What does the waveform
pictured below indicate?



Normal alternator output

Excessive AC ripple voltage

, A shorted diode

A shorted rotor winding - Correct answerA shorted diode



An alternator diode is being tested using the DVOM set to the diode test position. The diode is
tested with the leads one way, then reversed on the diode. Which of the following readings
would indicate a good diode?



0..1

0..55

0.55 / OL

OL / OL - Correct answer0.55 / OL



An alternator has a lower than normal output current. The alternator may not be faulty if the:



battery is defective.

engine speed was not high enough during the test.

drive belt was loose or was slipping.

All of the above are correct. - Correct answerAll of the above are correct.



An alternator has zero amperage output. Technician A says that the alternator field circuit may
have an open circuit. Technician B says that the alternator may have an open diode. Which
technician is correct?



Technician A only

Technician B only

Both A and B

Neither A nor B - Correct answerTechnician A only