Monday, I gave the wife's van a jump. Since then, my 93 Deville has had problems when I turn her off. "Cassie" emits a buzzing sound, and everything shuts down immediately. (no 10 minute delay) I would turn the key to the on position, and dash lights are dim, and Cassie gets very little power. After 5 minutes she starts up and runs fine. Where do I begin to look for potential problems? Battery is fine, fuses not blown. Appreciate all you fine people do here.