Here is something I found on my 02 pickup. I think it's different for 99-02 to 03-07.
For the 99-02 pickups, we have 3 cigarette lighters below the dash. One of them is on the 15a cigar fuse. The other two are on the 20a Aux PWR fuse. I pulled mine off before I could test which one was which. I THINK the Aux power fuse is dedicated for the two outlets. The Cigar fuse also has the data link connector on it. I think they did that to help diagnose the general use of the two main circuits.
Check all the outlets, and check these two fuses.