Windows don't work on an 82 300sd

[Dex40]

I'm looking at a 1982 300SD for purchase, but the windows do not operate. Also the mirror adjuster switch that sits between the windows switches does not move the mirror. The fuses all look good. Does anyone have any ideas what possible things might be wrong. Just looking for an idea of what I might be getting into? Thanks.

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[ForcedInduction]

Replace the fuses anyways. The tips often corrode off the fuses and break connection.

[Diesel9112]

Originally Posted by Dex40

I'm looking at a 1982 300SD for purchase, but the windows do not operate. Also the mirror adjuster switch that sits between the windows switches does not move the mirror. The fuses all look good. Does anyone have any ideas what possible things might be wrong. Just looking for an idea of what I might be getting into?

Thanks.

Below is a pic of one of my Window Fuses. As Forcedinduction said it looked good a first. But, when I pulled it out I got a surprise.
One Fuse connects to 2 windows 1 front and 1 rear; however they are acrossed from each other.
Anoter common problem area can be the Switches. They get full of crud and the Contacts inside the switch get burned up a little.
In the last pic below you can see the the red arrow pointing to one of the burned contacts, but, they are all burned to some degree. I scraped them carevully off with a knive and the Window worked again.

[Diesel9112]

I forgot to add there is also a Power Window Relay behind the Instrument Cluster. However, I have not read of anyone having to replace one yet. But, I also have not read of a case where none of the Windows function at all.

Normally some will work or at least partly work.

If both Rear Windows will not work there is a Child Safety Switch that can go bad and it will cut off the power to the rear windows.

[TargaNF]

You can test the window motor with a 9V battery. Behind the door skin is two wires that come from the motor.

They screwed to two other wires going to the relay.

Unsrew the wires and put the 9V on the window motor wires only. Should do something. + on + and - on - is " up " and + on - and - on + is " down "

If you want a little more power you can use a set of jumper cables off you battery. But a regular 9Volt battery is a little easyer.

Also its a good idea to clean out the gunk from inside the window switches like the above post said to do. I have had a switch stick down and blow my window motor.

Hope it helps.
Jay