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I just did a little experiment on my 94 GMC Sonoma. I disconnected a small 2 wire plug going to my alternator then started the engine. This caused the battery to not charge as it measured 11.8 volts (low because of having just started the engine). I then plugged the wires back in and the voltage went up to 14.6. I then plugged and unplugged it a few times, engine idling, and detected no discernible change in engine load, i.e. no change in RPM.
Maybe the ECU controls the RPM so well that a small load change is not detectable. Or, maybe the alternator load, particularly if the battery is nearly fully charged already, is negligible.
How much FE gain are you expecting by de-energizing the alternator field, once the battery is fully charged?
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