Seems all connections are solid and tight. Battery replaced about a month ago. Not a new one, but a known working (at the time) battery from the parts car.

Car gives lights, sounds and headlights when turned, just a click when the key is turned.
Battery charger on it now. Charger shows dead dead dead battery after a 45 minute drive.

Alternator?

If it IS the alternator, can I take the one from the 79 for the 81?
Fastlane has 65 amp for the 81 but a 55amp with internal volt reg and a 70 amp for the 79.
Doesn't really tell me if I can use the parts car alternator (new for that car about 4 weeks before it died).

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Ginny in Denver-ish
78 300SD, 265K (mine)