Starter engine: exact location?

Engine would not start..

After putting a new cilinderhead in mine BMW 735i '88.
The car wouldn't start anymore.
Not even a sound from the starter engine.
Battery is fine and connections etc.

I want to check the cables (connectors) to the starter engine.
But, i can not find the starter engine with the wires to it.

Is there anyone who can tell me where this is exact located?
Maybe with a picture or drawing.



Thanks a lot!