Per TSB REF.NO. MBNA 54/19, 72/9 from 1988, the wires should be replaced from the B pillar to the window switch -- with new connector soldered in and re-routed into the wiring harnesses. Cut the wires in the B Pillar and connect new wires all the way through the door joint to the switch wiring harness. There used to be a kit with an MB part number, but is no longer available. Wiring harness of repair kit 124 540 27 35.

I got this from AllDataDIY.com -- sorry I cannot cut and paste the entire thing for you -- it is copywright protected. But is only costs $25 per year and $15 to add another or to renew.

This was to have been modified and fixed on the W124 in November 1987, but that's not to say it couldn't still happen.

Make sure you disconnect the battery! I toasted the illumination on my center console switch becaue I did not. Had to replace the entire switch.

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David
1986 300E Anthracite + ECodes + MB Mileage Award