What can the problem be, 1999 Audi A6 Quattro when the headlights, windshield wiper, heat blower dont wor?

What can the problem be, 1999 Audi A6 Quattro when the headlights, windshield wiper, heat blower dont work?What can the problem be, 1999 Audi A6 Quattro when the headlights, windshield wiper, heat blower dont wor?most likely would b a fuse blown....next would b a bad dash ground.....next would b a bad or poorly charged battery or dirty or loose battery cables......next would b bad charging system.......next would b bad ignition switch.......then bad component(s).....What can the problem be, 1999 Audi A6 Quattro when the headlights, windshield wiper, heat blower dont wor?Ignition switch.