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I would be hesitant to do this as well for a few reasons.
What kind of energy savings are we looking at?
What is the risk of blowing expensive ECUs?
How much of a life reduction is there to a battery which is being cycled much more than it would be normally.
Seems to me that the best way to lower alternator drag is to do everything you can to lower it's load. Minimize HVAC use, radio, etc. if you do a good deal of driving in the dark, look into LED lighting. It is starting to be used and the efficiency gains over incandescent is enormous.
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