I have a 95' E320 that won't start. When I turn the key, nothing happens. engine and battery lights are on and the battery seems fine, but nothing happens. There is a humming/buzzing sound coming from the general area around the left AC vent and light switch ****. Any help/suggestions would be greatly appreciated!

 

Have you checked all of your fuses and relays?

Have you had your battery and starter tested?

http://www.ifitjams.com/starting.htm

 

Hello! I have faced the same problem couple of days ago. Like you when I turned the key it just switched on the lights and else nothing happen. Then I thoroughly read the diagnostic flow chart and doubled check the fuses. I checked the battery as well and happily this was okay. I recommend you to read the starter diagnostic flowchart.