What does an infinite reading on a solenoid coil indicate?

An infinite reading on a solenoid coil indicates that there is an open circuit within the solenoid. This means that the electrical path is interrupted, preventing current from flowing through the coil. When measuring resistance with a multimeter, an open circuit will display as infinite resistance because no continuity exists. This is a definitive sign that the coil is not completing the circuit, which is essential for it to function properly.

In a functioning solenoid, you would expect to see a finite resistance value, reflecting the applied voltage to create the electromagnetic field needed for operation. Other options, such as a shorted solenoid or developing fault, would show different readings; a shorted solenoid typically results in near-zero resistance, while a developing fault might show fluctuating or abnormal resistance levels, rather than a clear infinite reading.