Should my light switch lite up? I don't know how to remove the assy. to see if there is a bulb behind it.

The bezzle around the knob lights up, to show the different positions. Is it lit?

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1989 420 SEL

No! Nothing lights up. How do i get too it?

Anybody.

if it's similar to the 124 series, (i think all Mercs have the same basic design for the headlights switch) pull the knob off, then undo the big nut. The panel should then ease off.

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1993 320TE M104
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past:

1983 230E W123 M102
1994 E300D S124 OM606 (x2)
1967 250SE W108 M129
1972 280se 3.5 W108 M116
1980 280SE W116 M110
1980 350SE W116 M116
1992 300E W124 M103
1994 E280 W124 M104
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"music and women I cannot but give way to, whatever my business" -Pepys

Thanks Chazola. I will try it tomorrow.

Chazola has it right. The nut holding the bezzle is 24 MM. The bulb is a frosted pea bulb, I think it is about 1.2w.

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1989 420 SEL