Fuse location

I have a 1998 Chev Malibu with 80,000 miles. A 3.1 When I purchased the car a few months ago one cigarette lighter worked and the other didn't. I recently installed an after market radio. Following the installation the other cigarette lighter doesn't work. I cannot find the fuse on either side of the dash or under the hood that is for the lighters nor can I locate one that has been blown. Is there an inline fuse and if so where is it located?