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79' 300D, 85' 300D, 99' CLK430
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Discussion Starter #1
All of my in dash lights have gone out. Wich bulb do I replace, and where is it located? All the fuses are ok, and the lights on the shifter still work. Please help me[:(]
 

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1981 Mercedes 300D
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Did all the bulbs go out at the same time? If so - the dash light dimmer switch (rheostat...

Did all the bulbs go out at the same time? If so - the dash light dimmer switch (rheostat) may have gone bad on your car, or perhaps it was adjusted on accident. The dash dimmer is the left knob on the instrument cluster - if I remember correctly, if its rotated all the way clockwise, you will get the full dash brightness when the headlights are on. The light on the shifter is not affected by the dimmer switch. Might want to check this before tearing into your car to replace bulbs. To replace this, you have to remove the instrument cluster (see below). Its located at the bottom, and held in by one phillips screw. It pulls out of its socket once the screw is removed.

If a bulb has burned out - the bulbs in the instrument cluster are not too bad to replace. The easiest way to remove the instrument cluster is to remove the knee panel under the steering column, then reach up and 'push' the instrument cluster out of its opening. You'll probably have to disconnect the speedometer cable, the oil pressure guage (10mm nut), and maybe some electrical connectors as well in order to pull the cluster out far enough to work on it. The bulbs are on the back of the instrument cluster - there are two, located near the top. Twist the little bulb holders, then remove them to reveal the bulb. The bulbs simply pull out of the bulb holders.

The bulbs in the climate control panel aren't too horribly bad to replace either - it involves removing the wood trim piece around the climate control, then removing the climate control panel 'face' (its clipped on at the sides). From there there will be 3 bulbs visible - and you can carefully pull them out at this point. This is assuming that you've got the panel with the buttons arranged vertically.

The bulb for the other switches like the rear dome light, antenna, sunroof, and rear defogger is a bit harder to get to on the '77-'80 models. The bulb is located behind the climate control panel assembly. It is just a single bulb, the light is distributed to the switches via fiber-optics. The only way I've been able to access this successfully is to remove the entire center console. From there you can unbolt the climate control assembly, then finally access the one bulb for those switches! Not a fun job!

Anyway I hope this helps you out. Let me know if you have any other questions!
 

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1983 300Dturbodiesel
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297 Posts
the light in my automatic shifter works intermittendly, when the headlights are on and i s...

the light in my automatic shifter works intermittendly, when the headlights are on and i shift to drive then back in the other direction the light sometimes turns on, any idea what's causing this?
 

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1981 Mercedes 300D
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Probably a loose connection or a bulb that's burned out. The shifter light on my '81 had ...

Probably a loose connection or a bulb that's burned out. The shifter light on my '81 had that same problem...turned out the filament in the bulb was hanging inside the bulb and occasionally it would make a connection. Replaced the bulb and its been fine since!
 

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79' 300D, 85' 300D, 99' CLK430
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59 Posts
Discussion Starter #5
Thats for the advice, I tryed the switch, but the lights don't go brighter, so I think tha...

Thanks for the advice, I tryed the switch, but the lights don't go brighter, so I think that the switch is bad. They all just went out at once, so I'll replace the switch, Thanks for the advice [:)]
 

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79' 300D, 85' 300D, 99' CLK430
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Discussion Starter #6
I was about to change the switch, and them all of a sudden the lights went back on¿? After...

I was about to change the switch, and them all of a sudden the lights went back on¿? After a couple of days they went back off. Now I'm not sure what to fix. Please give me advice [xx(]
 

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82 300 TD
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I agree with IQ768. My dimmer switch did the same thing when it failed. Pretty easy to r...

I agree with IQ768. My dimmer switch did the same thing when it failed. Pretty easy to replace by pushing the cluster out from behind like IQ stated. While you are in there, I would go ahead and replace all of the lamps. The dealer should be able to give you the correct number of the two types of bulbs(one type for lighting the cluster and another type for the telltale or idiot lights) that are in there so that you'll have them beforehand. One word of caution though. When you are removing the instrument cluster, don't try and pull it out by grasping the top of it with your fingers because you can easily break the plastic lens. I know this from experience.
 
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