I have a 1993 300sd (w140)

In cold weather (32 degrees and below), the
idiot light on my dash comes on indicating
that I have a bulb failure somewhere. I look
at all the lights and they are fine.

10-15 minutes later the idiot light on the
dash goes out and everything is fine. I
figure that there is a marginal bulb some-
where.

Does anyone have any suggestions for testing
or is there something else wrong?

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Ralph Burnette
1993 300SD