In my 1987 300e, only the dome light works. when i open the door, all the normal lights turn on as they should. but when i went to go drop off my little brother at a sleepever tonight, none of the lights turn on such as the backlight for the dashboard like the speedometer/fuel tank/ and oil pressure. none of those lights work. in addition, none of the light for the temperature control such as a.c and heater don't work as well as the radio lights. i have tried moving the dimmer and that does nothing. my guess is that it is a blown fuse... shoudl go ahead and replace all fuses right now because of wear??? any other possibilities to why this might happen? oh all the functions work, i brought a flashlight and checked that they all work, radio works fine, ac works fine and so do all the gauges... ideas??