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Very interesting approach. I would have a couple concerns. 1- Your battery cable is still connected to the battery with three small wires attached at the battery terminal. There are still things in the car remaining powered with the switch off. In the event of a high amperage draw (starter motor for example) would the sudden current draw effect what ever is connected to those two wires? I would assume since a ground is still technically attached, the power would attempt to draw through those smaller wires. 2- If you do disconnect the entire negative connection from the battery, you will loose all memory in various modules/components and may need to re-perform all your drive cycles to pass an emissions test if that is something in your area.
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