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I don't know if anybody still makes one (because I've been out of the car audio game for a while now) but in the late 90's my friends neighbor had a rather large sound system in his GMC jimmy. He had an alpine alarm that monitored the voltage of the battery and if it dropped below 12 v it would start the truck and recharge it to 14 v. We could probably learn more about the monitoring system to adapt an automatic setup with an over ride incase ti decides to not work while driving.
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