2000 chevy blazer suv, just installed after market stereo, every thing great..EXCEPT now when headlights come on, either by sensor or switch, I lose all dash lights. Please help??

 

Have you checked your fuses? Also, you had to take the dash bezel off to install the stereo, make sure you reconnected everything securely and that a wire somewhere didn't get nicked. Easiest and cheapest places to start.

 

In with a bang huh... First day and three identical posts scattered across the forum... Please read the descriptions of the sections and more importantly, have a read through the rules of the forum before you post. Thanks

If the problem you are experiencing started after the stereo install, I would focus on the wiring involved there.