Chevrolet Repair: 1991 Chevrolet S10 Blazer instrument panel, chevrolet s10 blazer, chevy s10 blazer

Question
I have a 1991 Chevy S10 Blazer and every time I turn on the headlights my instrument panel goes dead no lights no gauges nothing, then when i turn the headlights off everything works again, any ideas?

Answer
HI JOE,OFF THE TOP OF MY HEAD I WOULD SAY A BAD LIGHT SWITCH [RE-OSTAT PROBLEM] WHEN THIS HAPPENS TRY TO MOVE THE LIGHT SWITCH COUNTER CLOCK WISE TO CLOCK WISE AND SEE IF THIS CHANGES ANYTHING. IF SO REPLACE THE SWITCH. WHEN YOU SAY NO GAUGES, DO YOU MEAN THEY ARE NOT WORKING OR THE LIGHTS ARE NOT ON THE GAUGES ??? I WILL ASSUME THE GAUGES ARE WORKING. IF SO,AGAIN THIS  SOUNDS LIKE A BAD SWITCH. LET ME KNOW IF YOU NEED MORE INFO. COULD YOU PLEASE RATE MY ANSWER WHEN YOU LEAVE THIS SITE. THANK YOU,,, TOM..