Automotive Electronics Practice Test

When half of the dashboard lights are dark, which technician's explanation is correct?

1. Technician A only

2. Technician B only

3. Both Technicians A and B

4. Neither Technician A nor B

The correct answer is: Technician B only

In situations where half of the dashboard lights are not functioning, the most likely explanation involves issues related to the dashboard's wiring, ground connections, or the health of the bulbs themselves. Technician B's explanation is correct because it typically points to a potential failure in the circuit that supplies power to those particular lights. This kind of issue can occur due to bad connections or wiring that may affect only a portion of the dashboard lights. Moreover, it may indicate the possibility of a common ground failure or an open circuit on that specific portion of the dashboard. On the other hand, Technician A's reasoning might suggest a problem that applies broadly to the entire dashboard lighting system, which wouldn't explain why only half of the lights are out. Such a scenario usually indicates that the problem is localized, rather than systemic. Thus, focusing on Technician B's proper identification of localized circuit or connection issues clarifies why this explanation is suitable for addressing why only half of the dashboard lights would be dark.