The adapter with 9V battery is a great idea and will work. There is only one thing you will have to watch out for when using it. You can't have any other power consumers come on while the truck battery is out - the 9V battery simply can't supply any appreciable current. The power consumers that most folks forget are the dome and courtesy lights. If someone opens the door, the poor little 9V battery quicly goes down to 0V. I plan to pull the fuses for the courtesy and dome lights before I plug the adapter in (also pull the under the hood light if it has one).
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