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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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Wiper chatter usually means the wiper rubber has become too hard and/or deformed.
The wiper action should be dragging the contact edge across the glass; then (with the direction change) on the back stroke, they should roll and drag the edge the opposite way.
When the wipers are "parked" they usually sit "rolled" the wrong direction for the next up stroke . . . though the bigger problem is when they hvae taken a "set". (The "Rubber" can creep)
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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