I apologize if this is covered somewhere else on the boards, I couldn't find anything....

I have a 1986 Blazer with a really strange acting electrical issue. This started after I got my Blazer back from the mechanic who replaced my fuel pump.

First thing I noticed was my radio stopped working and the lights on the radio flash intermittently. Then noticed other things happening such as;

Dome light stopped working completely

With my cell charger plugged in to cig lighter, if I turn the dimmer switch to on, the cig lighter stops working and the radio will stop flashing, however one interior light works with the dimmer switch on - the courtesy light under the dash on driver's side.

When I then turn off the dimmer switch, the radio starts to flash and the courtesy light goes out...but... then the courtesy light slowly comes back on to a low glow! I took this light bulb out, then the cig lighter wouldn't work.
It gets stranger....today I found out that when I push the rear window release button on the dash, it kills the cig lighter - with the dimmer switch on, the rear window release button doesn't work.

Fuses are good.

It sounds like a short, but I have no idea where to start, sorry such a long post, a lot going on!

Ideas??

Thanks