What safety precaution should a technician always take before beginning work on a vehicle?

Disconnecting the battery is a fundamental safety precaution before starting work on a vehicle. This step is critical because it helps prevent electric shocks and accidental activation of electrical components while servicing the car. Many modern vehicles contain sensitive electronic control systems that could be damaged if power is left connected, especially during procedures like working on the starter, alternator, or any other components connected to the vehicle's electrical system.

Additionally, disconnecting the battery ensures that accessories such as power windows, airbags, or other electronic safety features do not engage unintentionally during the repair process, which can lead to injury. Therefore, making this step a routine part of vehicle service is essential for technician safety and ensuring the integrity of the vehicle's systems.