Z4 2003 2.5i e85 not starting

Hi . Removed starter at it was only making a click noice and not starting, Need help!! the two small wires at the.back of starter one is black and the other is yellow and black, what is there function, if i put the ignition to start the black wire shows 12v and the yellow wire only only 2v what is the reason for this where can i look further.
 
Here you go.

M6510a.png
E85 Altenator.png

This is all the help I can provide you with though. I'm not electrician unfortunately.. :| Maybe some other forum member can help?
 
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