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This kind of problem can be difficult and time consuming but I will help walk you thru it if you have a test meter, preferably a digital multimeter.
This may be due to a loose connection. Are these lights controlled from only one location?
OK, thanks. Have you determined that the switch has power and that power is leaving the switch when it is in the ON position?
You have to check this with a multimeter (preferably) or a test light. This has to be verified to go to the next step.
Hello and welcome to Just Answer. My name is ***** ***** I will be happy to assist you with your electrical question.
1) Do you still require assistance on the lighting problem?
2) If so, do you have an AC voltmeter or a 2 wire lead AC voltage tester ( a contact type)?