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One of three things. 1. The Switch is broken 2. the Window motor is not working 3. A broken wiring.

Trouble shooting the switch is simplest. Take a know working switch and simply plug in and test. if it fixes the problem that's it. (You may try putting the only switch back in just in case it was a loose sensor)

The motor can be tested by applying 12V to the motor and see if it works? if not replace!

It the motor works with 12v applied look for a broken wire.

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Q: Why might the power windows on a 1986 Mercedes Benz 300 e stop working?
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