You can wire into the inadvertent power supply, controlled by the BCM, using a relay. Always hot after car started, and will stay hot for about twenty minutes after the car has been turned off.
I spent over three-hours in an airport parking lot, spinning CDs, talking on Onstar, getting in and out, setting the alarm (flashing the lights) and never started the vehicle, and the battery started the H3 immediately.
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Black Sheep Hummer Squadron
(ME TOO)
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