Went to dealer and had it diagnosed as follows.

needs alternator and perform wiring repair 3.2 needs front sam and coding 3.4 and needs airmatic control unit 1.8 (alternator shorting someone installed voltage regulator and chewed up wiring from sam is shorting circuit 61, and airmatic control unit is shorted)

I had alternator checked, and it is putting out 14.2 v, and also the amp is fine.
So what is really going on here ? Yes i did had voltage regulator replaced, but thats it. No one touched SAM. My airmatic is not working, and its a rough ride, i bought a brand new battery which died after 15 days. Could it be just a relay that needs replacing? Why do SAM need reprograming ?

What is circuit 61 ?

Any help will be appreciated.

thank you

 

Type in sam and Mercedes there is a couple of good you tube videos

 

I did, but there is nothing showing the location of FRONT SAM unit, or drawings.