I know this is an old thread but thanks guys for saving me who know how much money! I can now cancel my dealership appointment and keep my money.

After reading you post I went and completly pulled fuse #5 out. The conductor crumbled in my hand. I had tested this same fuse with a multimeter earlier today and it tested OK.

My 95 E320 had the symptoms described above. No start, no guages worked, buzzing from the combo relay (Turn signal, rear window defrost, Int. wiper relay). I took the cover off the combo relay and the center, turn signal relay, was going crazy! That explained the buzzing. I am going out tomorrow to buy replacement fuses and junk the 11 yr. old ones.

Thanks again!