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#1
12-22-2015, 05:46 PM
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w123 rear left door WINDOW only goes down
Hello everyone,
I have a 1982 300D that the rear left door window will only travel in one direction. I have read MANY other posts about similar issues, but have not found one exactly like this. Here’s the rundown of what I have done so far to troubleshoot. I removed the regulator and motor. I tested the motor to direct 12v it runs smoothly in both directions when the wires are swapped. The motor and regulator are currently not in the door, but I can watch the motor turn in both directions. When attached, the window motor switch will only work when the “down” is pressed. I removed, dismantled, and cleaned the door switch. I have also swapped out another witch that I know is working in both directions from the right rear door. The effect is the same. If I manually swap the green and black wires leading from the the switch to the motor, the motor will crank in the opposite direction, but still only when the “down” button is pressed. I removed and cleaned the console switch. I also swapped out the console switch with another switch and the effect is the same. All fuses have been recently replaced. Now i’m stumped. What else could cause this effect? 
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