I appreciate your response and thank you. I forgot to mention that I did attempt to jump my E300 off the S500's battery after receiving these symptoms. During the jump, I still experienced the same problems from my original post with the clicking, no turnover, etc.
Two items to note as follow up:
-My battery is less than one year old
-My alternator is less than one year old
-My car is currently in a heated garage

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Ed
-1984 Mercedes 190D 2.2 5-speed gray market(bought@30,000 miles) (Sold back to original owner@170,000 miles)
-1999 Mercedes E300DT (245,000 miles)
-1999 Mercedes S500 Grand Edition (80,000 miles)