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Originally Posted by lkchris
When driving Wife's 300E across (very deserted) SW Kansas, suddenly cruise control shut off. Then radio wouldn't work. Got to a town, and tach and turn signals didn't work. When shut off engine, car would not restart.
These are all symptoms of failing alternator.
Nice that the car "shuts down" various loads to get you home.
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If the alternator fails, all of the electrical loads must run from the battery. Since loads have different voltage requirements, the lower the battery voltage goes, the more loads 'shut down.'
I had a similar experience with a diesel you may find entertaining.
http://www.peachparts.com/shopforum/showthread.php?t=128023&highlight=alternator
You were lucky that the battery voltage did not get low enough that your fuel injection or ignition systems did not shut down.