I just recently put in a new instrument cluster in my 84 500sel (I'm not sure if that had anything to do with this, but it seems related), and now all my interior switch lights and gauge cluster illumination is dead. I checked my main fuse box under the hood, and all the main fuses are fine, but I was wondering if there was a fuse holder between some wires that deal with illumination that could've blown, or if I accidentally yanked out any wires. I can't continue to drive my car at night like this, so I really need to find the culprit! Does anyone know about the wiring of the illumination circuit in a 84 500sel? If this helps, most of the other things on the main fuse circuit, ie right rear tail light, license plate light, and right parking light, are still operational.