So my dimmer switch is acting up and i was in there swaping it out. when i had the new one in and turned on the lights i noticed the radio speakers were humming, put the old dimmer back in same result. Guess i never noticed it before with the old switch. The car has the factory stereo but someone had a cd changer hooked up, could this be the changers dimmer wire causing this humm? When i brighten/dim the lights the speaker crakles and hisses. I believe its only the passenger rear spaeker thats making all the humming n hissing. I dont understand why the dimmer switch would cause spaeker noise??