probably because you have defective switches , i had the same problem in mine , all i did was go to a junk yard find a couple and plugged them in till one worked .if that isnt the problem check the wiring to the switch
i went through 3 in a junk yard.. none looks defective i bought em all for 1$.
None workd.. it may be my wiring.. but my lighting is ok so i dont think its worth the time. im getin some fogs anyways and ill just replace the dimmer knob
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