1) Only hot wires are switched and never a neutral wire. However, the neutral wire is the return wire on any 120 volt circuit.
Therefore, the following items need to take place for a switched lighting circuit to work: If one or more of the folliowing is not present, the lights will not work.
A) Switch must be operationable/functional
B) Switch must have 120 volts feeding into it and 120 volts extending out of the switch (switched loop) to the light fixture.
C) Circuit must have a complete and properly spliced neutral conductor originating from the main electrical panel out to the light fixture.
2) If you can successfully measure 120 volts in and out of a single pole wall switch, then this confirms that the circuit breaker is functioning correctly since it is providing 120 volts to the switch. 120 volts measured at the light fixture switched loop wire also confirms that the switch is working. If this is all correct, the only remaining problem is a neutral issue.
If you have any additional questions, just let me know and I’ll be glad to answer them for you.
Otherwise, don’t forget to rate me before you log Off.