I am in the process of finishing the basement and at the moment have 5 basement lights operated by one light switch powered by one power supply (new construction). How do you you add more light switches to the existing wiring?
If one switch controls all the lights you will need to go back to a constant power source and run a new cable from there to the new switch. From the new switch you would run new cable to the fixture and disconnect or abandon the old wiring.
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