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Rick:
I have never spent any time with this particular circuit. Keep that in mind while reading anything I write. The alternator field circuit of the individual alternator should be between 1.6-4ish amps at full load depending on the alternator. You're never going to supply that kind of power from a couple little flashlight batteries. You said that you have 3.2v from the batteries and 0.8v at the alternator (field terminal). I'm certain that 3.2v reading is not at the same time you have 0.8v at the field terminal.
My guess (SWAG) is that the batteries provide just enough power to excite the field circuit and then it becomes "alive" after it gets turning. There might even be a one or two second ramping up as it comes to life. I would only have one alternator on at a time when you try this maneuver.
I would want the best D-cell batteries I could buy.
If you provide your serial number I will look at the alternator system schematic.
Dave
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