I Have a '85 300D with the following symptoms:
While driving, battery light came on and subsequently noticed that pwr windows, tach, gas gauge, temp gauge, blinkers, rear def, sunroof, etc. stopped working. I recently had a new rear window installed but have used the new defroster 5-10 times previously with no problem. Lights, starter and charging system appear to be working fine. Seems I blew some sort of fuse or relay that controls all non-essential equip. All the fuses on the firewall checked good. Any cure-all that may be a simple fix? My mechanic is swamped through the weekend so I may take a shot at it myself. Thanks for any help.