I suspect that your passenger side wiper is loose on the post.
Check whether it can be moved when the wipers are off. Loosen the nut
(it might be under a little plastic cap), pull the wiper arm off and
clean out the grooves which are supposed to bite into the metal they
mate with. Then replace the arm in the resting position and tighten down
the nut as tight as you dare without breaking the bolt. :-)
Good luck,
Larry A.

Mark Baker wrote:

>An odd problem came up in my '87 GL lately, and I've been unable to find a solution in the archives.
>
>  It seems the windshield wiper on the passenger side has developed a mind of it's own.  When the wipers are turned on, the driver's side wiper works as it should, while the passenger side wiper moves spastically if at all, sometimes even crossing over into the path of the driver's side wiper.  When this happens, it stops the motion of the driver's side wiper, I have to pull over, and attempt to seperate the wipers.  After just a few moments usually, the same thing crops up again.
>
>  Any ideas on how to deal with this problem?
>
>  Thanks,
>  Mark Baker
>  '87 Vanagon GL
>
>
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