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If a guy got creative, use the brake light to turn on the alternator - when the brakes are on, the alternator is on.
If a guy got REALLY creative, there is a TPS sensor wire which indicates idle. If the driver lets off the throttle and is coasting, turn the alternator on. You would have to use a diode, transistor, relay or something to not backfeed the wrong signal to the ECU.
If a guy got REALLY creative, have it come on automatically if the voltage drops below some set number - like 12.1 volts or something.
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