That's what happened in mine but it was first the ABS light and then the SRS light and it died. Then when I turned the key it was just those two lights and nothing else. I unscrewed the voltage regulator from the back of the alternator and it was shot. Replaced for about 30 dollars and bought a new battery and no problems since.

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1992 400E current
1988 300E sold
1973 280C totalled
1973 280SEL never got it running
1971 250C my first love but rusted out