Why won’t my car’s wipers engage?

My windshield wipers stopped working. But I hear the motor working.
The wipers won’t engage.

Check the mechanical arm linkage connecting the motor to the wiper arms.
Make sure all shafts, levers, and connector pins are in place. Make sure the motor’s armature is properly connected to the lever mechanism.
Sometimes one connector pin will fall out. Then the motor will run but its rotating motion cannot be transmitted to the wipers because the arms are not connected.

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