Which safety precaution is critical when testing electrical connectors?

Wearing protective gloves is a critical safety precaution when testing electrical connectors because it helps protect your hands from electrical shock, burns, or injuries caused by sharp edges or corrosive materials commonly found in automotive environments. Electrical systems can carry substantial voltage and current, and even a minor mistake while handling connectors can lead to serious accidents. Gloves can also provide a better grip, reducing the chances of dropping tools or components that can cause damage or create safety hazards.

While checking fluid levels, ensuring the vehicle is locked, and using wooden tools are all good practices in their own contexts, they do not directly contribute to the specific safety concerns associated with handling electrical connectors. The primary focus when working with electricity is to prevent any potential for an electrical accident, which underscores the importance of protective gear, such as gloves, in this scenario.