cigaretter light and radio on 1990 Chevrolet G Series Van (G20)

I bought a used chevy g20 conversion van and I plugged in a power inverter into the front cigarette lighter, it worked fine..I Pulled it out and went to try it again, I lost any power to the cigarette lighter and also my stereo doesn't get any reception, no lights on the stereo and the overhead reading lights do not come on. I checked all the fuses and traced wires for anything dissconnected....I am at a loss for words and am ready to pull what hair I have left on my head straight out

2 answers
Have you tested the fuses with a circut tester. I have found when I visually inspect fuses I have overlooked an actual bad fuse thinking it "looked" good. Only after I get to the hair pulling point and test the fuses for a complete curcit do I find the simple fix. Good luck
cheak the horn fuse thats what mine was it also controls the overhead lights and radio