What specific fuse are you looking for? There is the fuse block under the hood but depending on the circuit there is also one under the knee blocker(under the steering wheel inside the dash.)
Sorry, I just saw your title lighter fuse. It is fuse #31 and/or fuse #1 under the hood.
Also if you open the driver's door the other fuses should be on the side of the dash.
Looking for a Used Liberty in your area?
CarGurus has 7,233 nationwide Liberty listings starting at $990.
Search Jeep Liberty Questions
Jeep Liberty Experts