What is typically the primary function of a test light?

The primary function of a test light is to check electrical continuity. A test light typically consists of a light bulb connected to two leads: one for connection to a power source and the other to ground. When a circuit is complete, the light will illuminate, indicating that there is continuity in the circuit. This tool is vital for diagnosing electrical issues, as it helps technicians determine whether power is reaching a particular component or if there's a break in the circuit somewhere.

While measuring voltage levels is essential, it is not the main purpose of a test light. Test lights are designed more so for continuity testing rather than precise voltage measurement. Similarly, assessing battery charge and measuring current flow requires different tools—like a multimeter—specifically designed for those functions. Thus, the test light's role is centered around checking whether an uninterrupted path exists in the electrical system, making it a practical choice for quick diagnostics.