I have a '90 300E. I believe I have a bad convenience relay and my windows are non functional half the time. I looked at my box and it shows the part number: 124 820 30 26 next to the MB insignia. It also has a white dot on the upper edge of the case if that means anything.

A guy on eBay has one for sale, claiming it "Fits all 124 E class sedans 1990-1993" However, he shows the PN as 124 820 32 26

Anyone know (for sure) if these two parts are interchangeable ? Thanks in

advance....

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Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey

Yes, the 124-820-30-26 supersedes to the 32-26.

Both of those also SS to 202-820-42-26 as well.

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Thanks mbdoc.

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Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey

I take it you have already checked / cleaned your switches as mine were intermitent until I cleaned them and haven't had an issue since.

Cleaned switches, cleaned grounds, checked all connections - everywhere, checked fuses, replaced fuses anyway, checked continuity, checked connections at relay, checked for signs of moisture, .........you name it , I have checked it.....

Bought that convenience relay yesterday for $50. If this doesn't fix it, I'll consider a small, strategically placed, incendiary device next......

__________________
Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey

Replaced the convenience relay. Problem over.

Thanks all.....

__________________
Andy_M
'98 W140 S320 Black/Black
'06 W164 ML500 AMG White/Grey
'03 Porsche 986 Midnight Blue/Grey