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Old 06-04-2000, 12:16 PM
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I drove my 1984 300D through the carwash yesterday. The window lowered and raised normally before I went through, and lowered after I went through, but when I tried to raise them, the driver's window and the right passenger window will not go back up. I checked the connections on the switches in the shifter console and they seem ok. I have a Haynes Manual wiring diagram that shows two "window lift relays", but gives no instructions as to where they might be located. Can anyone help? It's beginning to rain. I don't know if it's raining because I just washed my car, or because my windows are stuck down.
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Old 06-04-2000, 04:27 PM
fz500sel's Avatar
Happy now in paradise!
Join Date: Nov 1999
Location: Venice, FL - "sharktooth capital of the world"
Posts: 712
Check your fuses! If I remember right, there are two fuses in the fuse compartment. One is for drivers side front and passenger right rear. The other is for the other two windows.

Good luck!

84 500SEL EURO 87K
85 300D 267K (and still goin' strong)

[This message has been edited by fz500sel (edited 06-04-2000).]

[This message has been edited by fz500sel (edited 06-04-2000).]
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Old 07-03-2000, 02:13 AM
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Thanks Frankyz!!!!!!!!!!! you just saved me a Sheeeetload of time and trouble!!!

I was just about to buy new electric window motors!!!!

I had already checked the switches and figured it just had to be a relay or the motors.... sure enough it was just a fuse!
Also noticed the "auxilary fan" fuse was blown too!

Mercedes... engineers crack me up... those fuses are such crap.... plus beware!! YOu should be sure to remove any old fuse metal pieces that fall off the old fuses.... those pieces like to hide down in there... and I can only imagine the electric arcs that would occur as a result of those pieces floating around in the fuse box! In my opinion ... they should have used a different type of fuse. Their such "kidders".... guess they don't want to make it simple to find replacements on the road!

Anyway thanks a ton!
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Old 07-03-2000, 08:29 AM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,315
If it's not the fuse, it is generally the switch that is bad. In all the years with 123's, I have never had a motor go bad.

If you get a window that won't go up on Sunday morning when it is about to rain, the time-honored solution is to pull the trim off and plug a working switch into the one that won't work's connection to get the window back up.

Chuck Taylor
Falls Church VA
'86 300E 5 speed
'95 C220 (wife's car)
'98 Porsche Boxster
Past: '79 280E, '82 300D (18 yrs), '77 240D,
4 250C's
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Old 04-06-2002, 08:43 PM
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Join Date: Feb 2000
Location: Powder Springs, Georgia, USA
Posts: 206
Smile Crazy Window Fuses

I thought for sure my right front window had failed today . The left front window worked and so did the right back, so I figured I had good power. Then I tore into the door but couldn't find a problem. Then, thank God I read this thread. I can't believe it. Then I checked the left rear and it didn't work either ! It was just a fuse that served the right front and left rear. Nowhere in the manuals does it indicate the window lifts are cross connected, kind of like a military or aircraft system. Why do they do that ?
David McDonald
1981 240D
1985 300D (wrecked)
1985 300TD 365,000 miles
1969 Mustang Fastback
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