I have a 1999 Forester. A few weeks ago someone cut me off and I learned that my horn didn't work. I checked all of the fuses and finally gave up. A few days later I thought about the horn again and it worked! Later that same day the rear wiper wouln't work, but the horn kept working. Well today the wipers working fine but the horn quit. I suspect a faulty ground. Does anyone have any ideas where I should start looking?