Hello and welcome to the forum - if you're planning on replacing your alternator, check out the link below to our site's DIY article on this process. If you have any questions, please feel free to post a Comment just below the article and we'll do our best to give you specifics with more details. Best of luck!
Mercedes-Benz W123 Alternator Replacement | 300TD 1977-1985 | Pelican Parts DIY Maintenance Article
-Dmitry