I did a search and didn't find anything. I have a 2003 blazer, when I turn the light switch to off, the radio turns off and the instrument cluster turns completely off as well. turn the lights back to auto and everything works fine. anyone have any leads? i don't even know where to start.

 

bump....nobody?

 

did you buy the truck with those problems?

 

Factory radio?

 

factory radio...no i did not buy it that way. do the speedo and radio share a common ground through the light switch?

 

Try scrolling the little dial next to the lights all the way up to just before it clicks.