Which safety precaution should be taken when working with automotive electrical systems?

Disconnecting the battery before beginning work on automotive electrical systems is a crucial safety precaution. This action prevents accidental electrical shorts, sparks, or shocks that can occur due to unintended contact with live circuits while you're working on the vehicle. It also helps to protect sensitive electronic components from potential damage caused by sudden power surges.

Working with the engine running can be dangerous as it presents risks such as moving parts, emissions, and electrical hazards. Wearing gloves only when handling wires does not account for the potential hazards in other aspects of the work, such as touching metal parts that may have live electrical connections. Lastly, using metal tools for better conductivity exposes you to risks of electric shock if they come into contact with live electrical systems. Therefore, disconnecting the battery remains the safest and best practice before initiating any work on automotive electrical systems.