The bulb works, the alternator obviously excites and puts out something.

The alternator was also replaced sometime back with a bosch rebuild (I have the receipt).

Ill be checking the voltage at the battery terminals when I get my hands on the MM. The info you gave is useful, thanks very much!

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
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1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)