... when I disconnected them while doing the shifter bushing replacement thing as described here:

https://www.pelicanparts.com/techarticles/Mercedes-W123/117-INTERIOR-Shifter_Bushings_Replacement/117-INTERIOR-Shifter_Bushings_Replacement.htm

The tutorial is good, I'm really happy with the results, the thing with the windows is surely not their fault.

Is a wee bit bothersome however. Both the fuses are still good, I hadn't disconnected the battery ground, maybe I should have, who knows. Disconnecting the wiring hubs in that manner is usually trouble free.

Just wondering if anyone else encountered and solved the same problem. I'm driving it now and using the sun roof for fresh air.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Have you got the window lockout switch activated? I don't remember if it disables all the windows or just the rear.

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]

That happened to me when one was down, suddenly no windows worked. Turned out to be the relay.

That’s the little button between the switches, the driver side and the rear left? I think that’s it anyway, I pressed it and tried it several times going back-and-forth, didn’t make a difference.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Good tip, thanks. I’m still learning my way around this car, that’s something I should’ve thought of. I had two BMW E30 325i models, DDs for about 15 years, I had quite the collection of relays harvested from boneyards. I could wait a few days for one from Pelican or I could go to the Newark (CA) Pick n Pull tomorrow and make that quarter mile walk back to the euro section. There are a couple of other parts I want to look for anyway. They have a couple of W123s and a recently added 300SD that looks pretty good in the photo. I have a couple of screen shots of the relay on my iPhone, could probably tell from the schematic and pin layout if a 126 item was the same.

I called the local MB dealer for the heck of it, they don’t have it, she doesn’t know when they’re going to come in, and didn’t even have a price she could give me.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Find a wiring diagram and start checking for power at the switches etc...

Maybe someone has a link because it's essential when diagnosing electrical faults

here:

Oops, response part two. I was looking closer, turns out I forgot to plug in the jack for that cut out switch. It all works fine now. Sort of a “DOH!” moment but I’m glad I spotted it, and your input got me thinking in that direction.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

This is all good food for thought, the wiring diagram as well. For now I’m glad the solution was easy. I have enough projects on the back burner for the moment.

I can put that long walk at the Newark Pick n Pull off for a few more days.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

I did not read all of the Posts so this could be a repeat of info.

On my 84 300D the #12 fuse powers the Power Window Relay. When that fuse goes none of the windows work. Note that Fuse is shared with other items. That means on mine there is 3 fuses that can cause power window issues.

I suppose the Power Window Relay itself could also go bad but I have never read of anyone replacing it.

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84 300D, 82 Volvo 244Gl Diesel

Try jiggling the key with one of the window switches depressed. The ignition switch sometimes wears and causes weird issues like the climate control not working.

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2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

That's good to know. I'll have to look at the guide on the backside of the fuse cover again but pretty sure that isn't mentioned. Just the a and b fuses.

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Te futueo et caballum tuum

1986 300SDL, 362K
1984 300D, 138K

Could be the wording; it has "relay window lift Term 86" Note that is on my 84 300D.

Attached Thumbnails

 

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84 300D, 82 Volvo 244Gl Diesel

In the wiring diagram in post #7 you can see fuse #12 at the upper left.

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84 300D, 82 Volvo 244Gl Diesel