1985 500SEL I can here the motor operating but the wipers are not moving. Is there a gear or a belt that needs replaced?

The W126 chassis has a w/s wiper GEARING assembly, make sure that the drive rod is secured to the linkage. All of this is below the plastic air intake under the hood.

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Thanks! Does this also make the wipers automatically retract when you turn them off? That stopped long before this.