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Old 04-07-2001, 12:43 PM
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I am have trouble with the dome light in my 1987 420SEL. The back light works when the back doors open. The front map light and dome light both work when selected by the switch. When the switch is set for the dome light to come on when the doors open nothing happens. It dose not matter if the drivers door or the passanger's door is opened. Both switches check ok but there is no voltage at the switch.

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Old 04-07-2001, 02:01 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417 voltage at the switch...

The bulbs in the dome lights are constantly powered and switching on/off is controlled by grounding the bulb...

I presume that the W126 S class dome light is similar to the W124 and later W201 dome lights...and these are known for their malfunctioning switches after several years of service.

You can get out the dome lights, dismantle the unit and clean the switch. If you are lucky it will bring you the requested light in the dark, if might have to get a new dome light...

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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Old 04-07-2001, 05:44 PM
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How can I get the domelight out?
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Old 04-07-2001, 07:59 PM
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on the W126 push it to the right (as you sit in the car) until the driver's side pulls down then the whole thing will come out.
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Old 04-07-2001, 08:58 PM
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Thanx DJ,

Appreciate it.

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