Ever since I've owned my car the rear defogger hasn't worked. When I press the button nothing happens, no light, no sound, no nothing. I got out a test light and I get power at the small purple wire and thats it. I checked the four connections at the rear and they are all on. I was thinking about hooking my test light up to the battery and making sure that there is no break in the rear. Im not really sure where to start. I just got a 2nd switch in the mail today and after hooking it up I still got nothing.