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  #1  
Old 10-29-2006, 11:36 PM
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Interior Lights

When I bought my '79 240D, the dash lights were not working. It was the common problem with the dimmer in the instrument cluster being broke, and I wired it so the dash lights would be on full brightness. However, I recently realized that there are other interior lights (heater knobs, headlight knob, etc.) that should be coming on. None of these work. Both dome lights do work properly. I can't find any fixes for this (or maybe I'm just not very observant). Any thoughts?

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Old 10-29-2006, 11:52 PM
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Its possible that all of the little bulbs are blown, since they are not a standard off-the-shelf item found in common parts stores. If you want to check the easy ones out, pull the knobs for the heater controls and you will find the tiny bulbs in the middle of the shaft that the knob mounts on. Check for continuity with a DMM or just buy some more as they are probably just all out and shouldn't cost too much each.
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Old 10-29-2006, 11:57 PM
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In my two 300TD's there is an early fiber optic type of "spider" assy coming off of a bulb. Look behind the dash to see if it could be your problem. (I am only guessing that 240's have them also)
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Old 10-30-2006, 12:37 AM
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Quote:
Originally Posted by JimmyL View Post
(I am only guessing that 240's have them also)

They do, however I think they only light up the switches below the center vents.
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  #5  
Old 10-30-2006, 01:07 AM
ForcedInduction
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The headlight knob has it's own bulb. Check the fuse panel for a blown/corroded fuse.
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  #6  
Old 10-30-2006, 04:24 PM
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Well, I don't think it's the bulbs. The one in the headlight switch is fine at least. I don't think there is a fiber connection, i can see the little bulbs and tested the one in the headlight switch with a power supply. It light up fine.

Fuses seem to check out ok, they all look fine and the gauge lights work- I am assuming they are on the same fuse. If anyone knows what fuse # the knob lights are on, please let me know. The gauge lights are on #1, I am pretty sure.
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Old 10-30-2006, 05:04 PM
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Something happened when you wired around the dimmer switch, then. The dimmer switch also dims the other interior lights (headlight switch, ventilation controls, etc) so that you can go "lights out" if you turn the dimmer off.
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  #8  
Old 11-01-2006, 01:59 AM
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Hmm, good thought. Have to play with that tomorrow when it's light outside. Is there more than one circuit in that thing?

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