Final answer:
When using an electrical connector that may be exposed to moisture, it is important to use a waterproof connector to prevent damage.
Step-by-step explanation:
When it is necessary to use an electrical connector that may be exposed to moisture, the mechanic should use a waterproof connector that is designed to prevent water from entering the connection. These connectors are usually made of materials such as rubber or silicone that provide a tight seal. If these connectors are not used and moisture enters the connection, it can cause corrosion and damage to the electrical components, leading to malfunction or failure of the device.