Hi All, I wrote a detailed description a few years back for the Catalina 36 association and they had linked to it but I deleted my web site so I don't know if it's still there or not. I re-wrote this upgrade, blog style w/pics, and posted it on my new web site. Anyone who owns a Universal M-25 may be interested to read this if your thinking about upgrading your charging system. Here's the details and picture based details: http://www.pbase.com/mainecruising/catalina_36_alternator