Which symptom may suggest an electrical issue in a vehicle?

Flickering lights are a clear indication of a potential electrical issue within a vehicle. This symptom often suggests problems with the electrical system, such as a weak battery, a failing alternator, or poor connections within the wiring. When the electrical supply is unstable, it can cause lights to flicker as the current to the bulbs fluctuates. This instability can also affect other electrical components, leading to further issues if not addressed. Identifying this symptom early can help prevent more serious electrical problems down the line, ensuring the vehicle remains reliable and safe to operate.

The other symptoms listed, such as stalling engine, squeaky brakes, and rough idle, are typically associated with different mechanical or fuel system issues rather than electrical ones.