Rear power window/motor DIY - Page 14 - Mercedes-Benz Forum
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post #131 of 134 (permalink) Old 05-31-2019, 02:14 AM Thread Starter
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Yes. You could just briefly touch the disconnected contacts (and reverse the polarity) to prove that the motor works in both directions. However, the motor rotation could be jammed by a broken lifting mechanism. There are no fuses here to protect the motor. The module looks after that situation when connected normally.

I would prefer to remove the motor completely and apply the 12v power at a work bench. No chance of further damage then, and it should rotate freely.
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post #132 of 134 (permalink) Old 05-31-2019, 02:59 AM
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Thanks Keyhole ,,
The thing is ,,I have fitted new cables and main pulley and slide block,,,and so the thing I want to test is the mechanism,,to make sure it moves the way it should. I can't put it in the car ,,because I already fitted another unit from a wrecker....

I am pretty sure that the motor will run ok .

Thanks again.
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post #133 of 134 (permalink) Old 06-02-2019, 02:29 PM
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Putting 12 volts to the black and green connectors allowed me to bench test the regulator prior to installation. The cables loosened up a bit and the trolley moved as it should in both directions. In the full "up" position, the bracket that holds the window won't clear the opening, so you have to install it in the "down" position, then raise it to line up access holes to easily install the glass...Steve
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post #134 of 134 (permalink) Old 06-03-2019, 01:47 AM
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Yes,,,I did the same ,,,happy to report the trolley bracket moved nice and smoothly and to the end of travel in both directions,,,,so it seems that quite tight cables are just the way they are supposed to be..
Thanks again..
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