Red Seal Automotive Service Technician Practice Exam

Which of the following is a sign that a vehicle's battery may need replacement?

1. High engine temperature

2. Slow engine cranking

3. Excessive oil consumption

4. Weak headlights

The correct answer is: Slow engine cranking

Slow engine cranking is a clear sign that a vehicle's battery may need replacement. This condition occurs when the battery is unable to supply the necessary voltage to turn the engine over quickly and efficiently. A weak or aging battery may struggle to provide enough power, resulting in a slower cranking speed when the ignition is engaged. In the context of vehicle diagnostics, slow engine cranking often indicates that the battery may be losing its ability to hold a charge or deliver sufficient current, which is crucial, especially in colder temperatures or when the battery has been subjected to consistent use. The other options provided do not directly indicate a battery issue. High engine temperature typically relates to the cooling system, excessive oil consumption may indicate engine wear or leaks, and weak headlights can be influenced by other electrical components, though they may indirectly suggest a battery issue if the vehicle's electrical system is failing to deliver adequate power. However, slow engine cranking is a more definitive and specific indication of battery health.