Where is the fuse for cigarette lighter a 1997 f150?

The fuse for the cigarette lighter in a 1997 Ford F-150 is located in the underhood fuse box. It's not always labeled "cigarette lighter," though. It might be labeled as "power outlet" or something similar. You'll need to consult your owner's manual for the exact fuse location and amperage. The manual should have a fuse box diagram showing the location of each fuse.