Grounds and wiring are often the source of electrical problems. Sorry we didn't talk about that in our previous discussions. For most of us, the obvious problems are the ones that we look to first and only after eliminating them to we start checking what are frequently, the most time consuming but, if you are doing the work yourself, the least expensive problems to solve.
Switch location can be confusing, especially if unlabeled or if someone has rewired things so that the label are no longer correct.
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