Crazy Wipers

[burnt03]

My wipers travel pretty much the whole range of travel possible. Only thing that seems to stop them on the downstroke is the wiper pump cover. I tried the adjustment screw and got it to where I thought it was fine, but after a while it just starts going wild again.

And, my one circuit doesn't work where I shut off the switch and the wiper is supposed to come to a stop at the bottom of the windshield. Not sure if that's related though.

Any ideas on what might be the problem?

Thanks