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Simplest design would be a relay that connects your alternator control wires whenever the brake lights come on. That would mean you would need to lightly press the brake pedal when DFCO. Most elegant design would be to have Arduino monitor for open loop, which usually implies DFCO, and have it control the alternator. You'd also want it to monitor voltage so it activates the alt if the charge level drops too low.
One downside is that open loop is usually activated at full throttle too, so you'd want the logic to check throttle position and not enable the alternator in this situation. Don't want the alternator dragging your acceleration down when mashing the skinny pedal.
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