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#1
03-23-2006, 12:53 PM
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Interior switch light relay?
Hi all,
Its a '83 MB 300D. My interior switch lights (temp control, defrost, sunroof, etc.) do not illuminate when I turn my headlights on. I've replaced the single bulb connected to the fiber for these controls but the problem persists. Does the power for these control lights/bulb go thru a relay (that might be bad)? Any other ideas? JWJ 
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#2
03-23-2006, 12:59 PM
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Rotate the dash light rheostat back and forth until it works again.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#3
03-23-2006, 01:41 PM
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I wish it was that easy.
Pete,
Its not the lights for the RPM, temp, and speed gauages. Its the lights for the AC, defrost, and window buttons that are the problem. The rheostat has nothing to do with them from what I understand. Please correct me if I'm mistaken. Thanks
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#4
03-23-2006, 02:14 PM
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OK, now MAYBE I understand. I think those lights work off a different contact off the headlight switch. Best to consult a schematic for your particular model, then check for continuity at the pertinent switch contact. Also, the ground wiring sort of daisy-chains from one bulb socket to the next, try bringing one socket ground contact "down to earth" and see if the other bulbs light.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#5
03-23-2006, 03:54 PM
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The dimmer will dim all the lights in the dash, climate control included.
__________________
1981 300D 147k 1998 VW Jetta Tdi 320k 2001 Dodge Ram 2500 141k 1979 300D 234k (sold) 1984 300D "Astor" 262k(sold) Mercedes How-To and Repair Pictorials I love the smell of diesel smoke in my hair 
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