Save a little time by powering up your motor directly. Remove the door panel, power the two screw terminals. Forward and reverse polarity will run it up and down, if it's from a jumper box and nobody's pressing the switches, you'll be fine.

There have been several owners of 124s who have had wiring failure in the B-pillar/door interface and cause the window to stop. Also, try opening and closing the door with someone holding the button down, if it starts to work it's your wiring.

A search on the diesel forum will show a DIY and pictorial, might be in the DIY forum by now.

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- Jeff