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hi there, did you ever get how the fuses works ? I saw that you have the same problem, to tap into a fuse and the power will stay on with the engine on, but the key still in the ingnition. that's my problem too. I have a 3G router that I don't want to leave it on all day, but when I put the key in the ignition to give it power, just like the MMI powers. any thoughs ?