Unscrew the end of the plug where the little spring-loaded pin is, then pry the cig. lighter case apart. Inside is a nice board with a fuse and those two ground connection bars. Remove the fuse and de-solder the red wire from where it goes through the board at J (right next to the capacitor). That's where you need to solder a new 12V wire, preferably through an inline fuse-holder with a 2 amp fuse (same as what you pulled out). The neg. connection is a little tougher, but it shouldn't be too bad. De-solder that big shiny thing with the wings that contact the sides of the cig. lighter socket or just bend it back and forth until it breaks off. There is a hole there (labeled Gnd) next to the slot used for holding that thing in place. Put your neg. wire through that hole and solder it in. Run the wires out through the tip of the cig lighter plug, snap it back together, screw the tip back on and hide it behind the dash somewhere.