From the FAQ...

Here's how the ashtray/thermal fuse connects together.

 

Well the colors all match up but mine does not work at all if you press it in the light does not come on at all. What the hell would cause this. Please help I mean my windows are tinted really dark so it really serves no purpose but it would be nice for everything in my car to work ya know.

 

Well, try what i did. Turn on your car and have no music on, complete silence. Then every time i pushed the button i would hear a click in the back of my car but not see any light so i knew it was working. So after that i just kept pressing it and eventually it the light just turned on. If there is no click, then it's not working at all. Sorry i cant be much help.

 

I know you guys probably know this, but I'll share anyways. The rear defroster has an auto shut-off after like ten minutes or so. Maybe the switch that turns off the rear defroster is malfunctioning thus turning them off right away. Since after your switch was replaced and it still doesn't work this makes a little more sense. And maybe this is somehow connected to your clock. Just a thought...