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I don't know. It would have to be a trial and error thing.
As the rotor still turns (engine on) there could be some residual magnetism left in the iron core therefore even with the field unpowered there is a possibility that it will still produce current.
Likely the field would have to be grounded (on both ends) to eliminate this but these are just my thoughts/guessing here.
Now if you use a contactor (big relay/switch) on the output side going to the battery to open/close the circuit, you might have better results.
I never played with this so like I said trial and error type thing.
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