Yep. Sounds like either a dead or dying battery, no charge on the battery, and possibly a fault in the charging circuit. As suggested, verify all grounds are free of corrosion and are tight. Check for loose belts.

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Codifex
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)