I would try changing the bulbs first. If your tail lights are like mine used to be they would fill up with water and they the bulb would burn out. The lenses will hold about 2 cups of water if you let it. Pull you tail light off, see if there is any moisture in the lens housing. Then replace the bulbs and see if they work. You may also have to do a little cleaning up of the metal strip that holds all the bulbs. Since mine got wet there was a bunch of corrosion on it, which kept the lights from working properly.

Note: If your tail lights are collecting water. Get some closed cell foam and make new gaskets, it's much cheaper than dropping $60 for two gaskets.

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