" I disconnected the field wire on the generator and then ran the tractor. The ammeter then does not move(no spiking), the generator does not get hot, and the voltage across the battery post on the running tractor reads 9-10 volts." Something wrong with that picture. With field wire disconnected, the gen should not output enough voltage to even begin to charge the battery, so where is this 9-10 volts coming from on a 3 cell 6volt battery?? Maybe you don't have a 6v battery or maybe you need to try another voltmeter?
To further elaborate on mis-match of "A" VR on "B" gen or "B" VR on "A" gen, in both cases, there will be no field current & no output.
I might look toward intermittent conditions for the kind of radical jumping ammeter readings that you report. Maybe wiring shorting or bad/loose/intermittent gen and/or VR grounds.
This post was edited by JMOR at 18:04:25 07/28/13.
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