Hi Pizza Guy. Really appreciate your reply. I was able to get a hold of my old Mercedes Mechanic (4 hours south of me) and he told me to disconnect both positive and negative cables and the hold them together, and even tape them for at least 5 minutes. He said this should "clear" system. Then reconnect both cables to their orignal Positive and Negative posts. Well I'll be damned. Car started with normal warning light sequence. The speedometer returned to zero, and the car runs just like it did before the "Haywire". Because the car always started and stayed running, I'm going to have to rule out the RCM. Although I will remove and inspect it sometime very soon. I will post if anything changes. My Xfire is a 2007. Convertible by the way, with 115,000 miles. Still lovin it!