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Feel free to poke holes in my theory. Holy crap, 3700W amp! Do you have three 10's in there? Seems like some serious audio pleasure that could draw more than your alternator can put back into the battery. Kind of sounds like the amp is being energized when the key is half-turned (auxiliary power), regardless if the radio is turned on or not. Again, just possible things that could be drawing power during un-commanded timelines (pardon the engineering/legal speak).
Unrelated to this topic, it reminded me of sneak circuits. I recall a scenario in the 80's-90's where the engine could be started if you engaged the left turn signal, pressed the brake, and turned on the radio. Most engineers are cognizant for sneak circuits these days though, but aftermarket mods open up Pandora's box again.
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