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Could the glowplugs be sticking on? I know the '80 diesels have relays that sometimes stick on and can cause what you are seeing, but I can remember if the '78s have relays. Either way, when the glow plugs are on, even when everything else is working perfectly, the alternator tries and tries its little heart out, but it just can't quite keep up and the voltage sags. 12V sounds about right from the threads I've read (hasn't happened to me personally.. yet).
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