1996 Blazer 4x4. I have had it since new, but now my daughter is driving it to collage.
It is really acting crazy. No headlights, no DRLs, interior and exterior lights are flickering on and off, including dome and dash lights and running lights. The door/lights on chime is flickering on and off. This is while the car is with or without the car running. New battery, new DRL relay, new multifunction switch, new headlight switch, all fuses are good, both circuit breakers are good. I had the left headlight on really bright and the right headlight on really dim but only in DRL mode. Now while checking everything I have even lost the DRL mode. They schematic shows a DRL module but I cant find it.
Her boyfriend put in a stereo and an amp but i have removed them and it is still the same. I am lost on where to go from here.

 

Also these are sealed beams and i have no voltage at the headlights.

 

Found it..... A pinched wire. I will update later....

Ok...What I found....My daughter had a mechanic, where she lives, install a new multifunction switch. While doing so, he got the wires to the nuetral safety switch in between the 2 pieces of the main harness connection. The one with the screw in the middle, to bolt the 2 halves together. Its under the left side of the dash. Those 2 wires are the only ones not taped up in the bundle and they are kind of long. when they were crushed in the connector, one of the male mini terminals pierced one of the wires and created a ground. When the headlight switch was turned on, it would go into thermal overload and shut down the circuit. Thats why they were blinking on and off. The overload switch, built into the headlight switch, was constantly making and breaking. I had to cut the two wires out of the connector and splice them together because the connector was ruined on those 2 terminals. 2 full days and everything in the dash removed. But on the bright side, I now know where every relay and connection is, ......David