tips on replacing an alternator in a 2004 c-230 Kompressor
 

I am having an occasional alternator/battery visit workshop light over the past year. I replaced battery and did not fix..now every week or so in the mornings the instrument panel freaks out for 30 seconds or so with all kinds of failures and then its fine. any ideas on what may be going on?
Would like a tip on whats need to replace alternator.

Please HELP!