Thanking everyone in advance for your help.

I have a 1993 400SEL (w140) that is very difficult to start in the mornings. I hear a hi-pitch whinning sound, but the iginiton won't engage. It usually takes 15-20 turns of the key before it starts.

Does anyone have any suggestion and can you tell me where the starter and ignition switch is located. (Pictures would be great!!)