Your easiest and cheapest way to go is buy an outlet and your local auto parts store. You will also need some flat female connector clips, 1ft of 12-18 gauge wire, a test light and wire crimpers. You will need a dremel or fine circular file, a drill and a razor blade. You may want some electrical tape but if you get the shielded connector clips then no tape will be needed.
The plug for the cigarette kit is just behind the side panel on the passenger side. You can get to it by removing the glove box and then pulling the panel out. Careful by the parking brake there is a clip. You have to pull the panel down to unhook it. Once you've done that, you should be able to see a white plug with three wires going to it. It is clipped into a piece of metal. Unclip the plug from there. Now you need a test light. The black wire going to the plug is ground. You can clip the test light to that prong. Turn the key on in the car and check the other two prongs on the plug. Whichever one lights the test light is your power. The other prong will not be used. Now that you know which wire is you power you can cut the mounting hole for the power outlet. Take the panel you pulled out and figure out where you want your outlet to be on it. Be sure to check the clearance for the outlet, you don't want it to hit the metal plate that is behind the dash when you re-install the panel. Once you've got your mounting point figured out, you'll want to take the razor blade and cut the cloth covering off that area. Makes it a lot easier cutting the hole for the outlet. I used a socket that was little smaller than the power outlet to help guide my razor blade. The cloth is glued down so once you cut the circle, you'll have to peel the circle section off. Now with a 3/8 or 1/2 drill bit, make your hole. The use the dremel or file to enlarge the hole until you can fit the power outlet in. Once you've mounted the power outlet to the panel, cut the 12-18 gauge wire for your power. Put a female connector clip on each end. Make two of these wires if the power outlet didn't come any wire. Once you're done with that, plug the wires to the power outlet and the plug behind the dash. Re-install the panel and the glove box and viola! An extra power outlet.
My cost was about $7 and an hour or less of my time, compared to the $62 the dealership wanted for the cigarette option. I also found a four way power splitter which is handy when you've got a couple friends with ya and everyone needs to charge their phones. I use the splitter in the center console and the radar detector goes to the new power outlet, which keeps the wire from hanging in front of the radio and around my shifter. If you have any questions email me, I'd be happy to help.
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