ok here is my situation:
i have a 2001 silverado. when my headlights are on and i turn on the dome light inside the truck, my dash lights, ac lights, and stereo lights turn off.
what could be the problem????
i posted this in the electronics section but no one seems to have an answer

 

sounds like a ground issue... have you touched any thing that may have affected a ground wire under the dash? maybe try to identify a ground wire under the dash and check it, or run another.

 

not sure. i did have an aftermarket radio, but then i took it out and put the stock one back in and thats when i started to notice this.