Hey I am about to buy a 1989 Chevy Silverado 1500. The only problem is that the windshield wipers and the brights dont work. I checked the fuses and none are blown. I was thinking about replacing the Wiper motor, Turn Signal Switch, and the Turn Signal lever because the brights and wiper controls are on that lever. Could someone advise me as to what I should replace first? I would hate to spend money on parts I dont need.