1967 Buick GS400 windshield wipers were not working. Checked switch connections and ground. Also replaced windshield washer pump. Now, the wipers work on low and high, but the wipers (non-depressed) will not park themselves. What causes the wipers to park? Condensor? Where? Also, the washers work, but as soon as they are turned on, they stay on until the wipers are turned off. Seems to me they should spray for 3-4 wiping cycles Any ideas what to check next?' Thanks!