The easiest way to make your 12v socket always hot is to get a wire and run it from your battery to the socket.
The way I did it was to get about 8 feet of 12 gauge wire. Run that from your battery, then through the plug in your firewall behind the pedals, then over to your center console. Take out your stereo and find the blue wire to the socket. Cut the blue wire and connect the wire from the battery to it. I also reground the socket to where the stereo screws on to. And if you don't want to start a fire I would attach a 15-20amp fuse about 18 inches from the battery.
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