Hey All,
I have a 1993 400E. Recently the dashboard lights went out. I have tried adjusting the knobs with no results, so I know it isn't that. The lights on the AC/Heat displays have been out since I got the car, I never even knew they could light up. All of the warning lights and hazard warnings still work and light up, like all the ones in the row with "parking brake." I was wondering if anyone has any suggestions for bringing these lights back. Are there some fuses I could try swapping out? Also, my headlights and brakelights and all of the little fog lamps and stuff go out very frequently, I was wondering if this could be interconnected either through fuses or some sort of overall electrical thing. I have heard that this sometimes happens if the battery is overcharging everything, does anyone know the ideal voltage it should be at when the car is on? Thanks.

Hello, I had the same thing happen to me. Check the rheostat ( dimmer switch) that may the cause of no lights. I was able to just remove the instrument cluster and remove the part and solder it back together. Hope this info. is useful.

yup, check your fuse...underneath hood, righthand side...blacc box w/lid.

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1994|040|W124.036|E500
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Two items come to mind. First the dashboard illumination control unit. See link below.
Electrical Diagnosis: I was stumped

And the tiny fuse element, part #2015460025, in the instrument cluster. It's behind the cluster, the part that you see looks like a little bulb but it's red, it's the only red one back there. It fits into the rear of the cluster like some of the tiny bulbs.