I have suddenly developed a problem with the windshield wipers on my '92 Dodge Dynasty. I can't turn them off! Intermittent settings also no longer function. When the switch is in the off position, the wipers are working as if they are at the "low" setting. I can switch it to the "HI" setting, but can't turn them off. I also noticed that the headlight warning has also stopped working. Both were working normally this morning, but just stopped. Any thoughts? '92 Dodge Dynasty, 3.3 L, A604 147000 miles. Bret