The alternator came fro O'Reilly Auto Parts and was rated at 65 amps. The battery is about 3 years old and is of the traditional style (not maintenance free). I have not had very good luck with maintenance free batteries.
The voltages I mentioned in my original post were at normal idle speeds. My tach reads about 750rpm at normal idle.
I don't recall if there was any preservative on the wiring harness connection to the alternator but I will check it out.
Thanks for the help. I'll post my progress.
1990 Mercedes 300SE (147,000)
1985 Mercedes 300SD (203,000)
1983 Mercedes 240D (167,000)