Why not just put a relay on the field control circuit? I have been thinking of disabling accessory belt items, and think that just "un-field" the alternator would prove satisfactory. I put a light bulb on the EGR valve to monitor when exactly it is engaged. My discovery was that it is active when the engine is cold or not under (some) load. When warm, it would de-activate as soon as I put a little more pressure on the pedal.
Why I mention that is that it could possibly be a way to make the alternator only come on during low-load times (when EGR is active)
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