Hello,
The ground circuit looks fine, as I mentioned in an earlier post. I found what I guess is the aux. water pump connection you were talking about... the wires from the alternator are connected to a bundle of wires that go back up to the starter, which also connects to the positive lead of the battery. Another wire from this bundle goes down past the alternator to what I suspect is the aux. water pump. Voltage drop between that and the positive terminal of the battery is ~13V. Obviously the two are not connected, though the they should be, right? The car starts fine if I charge the battery, so the connection between the battery and starter must be OK... leading me to believe that the problem is with one of the wires further down the line.

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1985 300DT, Classic White, California, 175K
1984 300TD, Classic White, Euro, 285K


"When nine hundred years old you reach, look as good you will not. Hmm?" - Yoda