I recently got a 1994 Chevy k1500 ext cab, and when driving at night ive realized when I turn my headlights on the little climate control screen will turn off. If I have the heater blowing while it happens it will stay blowing and be fine but then once I turn the headlights off the screen goes back on. Also, when I turn my headlights on the instrument cluster stays dark and none of the backlights turn on on it. Ive checked all the fuses and they all seem to be good and the right amp fuse. Has anyone had this problem or know how to fix it?? Thanks.

 

probably a bad ground