Hey how’s it going guys I’ve got a 1984 Blazer I just got 2 days ago since I got it the headlights and brake lights are not working and when I turn the hazards on only the front hazards work not the rear tail light hazards I checked all the fuses under dash and they are getting power and are not blown. I also unplugged the multi purpose switch and the 2 orange wires seem to not be getting power.

 

I am normally a second gen guy so I am not sure if I have the correct wiring schematic but lets give this a go. Report back if you have power at the pins of any of the failed lights while they are supposed to be on with the bulb removed and the negative lead of the volt meter on a solid clean frame ground.

George

 

Can you please expand a bit on your Blazer?

Model
Year
Engine

Membername suggests a K5.

Can you add some pictures from the fuse box, overview of engine bay and rear (the inside where the wires plug to) the rear lights?

That will help a great deal.