What is the primary purpose of the 'wiggle or tug test'?

The primary purpose of the 'wiggle or tug test' is to detect intermittent or loose connections in electrical circuits. This method involves physically manipulating the wiring and connections in order to observe if any disruptions occur in the operation of the device or system being tested. By applying pressure or slight movement, a technician can identify points where a connection may not be secure, which can lead to intermittent faults that are often difficult to diagnose through standard testing methods. Detecting these types of issues is critical since they can cause erratic behavior in electronic devices and systems, leading to operational failures.

While other testing methods may focus on measuring power, identifying faulty resistors, or assessing voltage, the wiggle or tug test is uniquely effective at pinpointing faulty connections that could compromise the reliability of a circuit.