How to test if a 12V wire is live?

Proceed to touch the tip of the red probe gently but firmly to the suspected hot wire. Remember to keep the black probe disconnected from any circuit component for this initial voltage check. This action will allow the multimeter to measure the potential difference between the wire and the ground, indicated by the black probe's common connection.

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To begin testing voltage with a digital multimeter, it is essential to properly insert the probes into their designated ports. Locate the port labeled "V" or a similar marking, and insert the red probe securely. The black probe, on the other hand, should be inserted into the port typically marked as "COM."

With the probes correctly in place, the next step involves testing the wire in question. It's crucial to identify the wire you suspect carries live current, commonly referred to as a hot wire. Approach this step with caution, ensuring your safety by wearing appropriate protective gear.