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if it is the kind that has a little wire whip that comes out of the new brake light assem it just plugs right into where the stock bulb would go. at least thats how mine worked
the plug is under the headliner. I had to pop the 2 tabs in the back (mine is an extended cab) and reach in and unplug it. I had to bend it quite a bit to reach it but it is definitly doable. good luck!