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In my '06 Ford there is one of the 12v accessory plugs in the cab, that remains hot even when the engine is off. I have to be careful to unplug whatever is there to not run down the battery, but your comments about the 7 pin plugs seems to be pretty accurate.
If I didn't want to run the engine, I have used this hot accessory outlet for any short term 12v need (i.e. power inverter). You still gotta be aware of the discharge rate and keeping the battery safe.
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