We recently purchased a 1998 BMW 740il and have had weird electrical issues from the beginning. ABout 50% of the time the radio won't work. And if the radio does not work, the horn is out. Recently when the radio would not turn on, the steering wheel would go up and down and the inside right door light would come on. Sometimes when my wife pulls down the visor vanity mirror (driver's side) the radio will turn on. To hard to explain and to weird. You almost have to see it. When we took it to a repair shop, they were baffled? Any ideas or suggestions? Something is going on that controls the radio, horn, steering wheel, inside door light and when one does not work, they all have issues. Thanks for any suggestions.
Tony