Blown stop lights/hazard flasher fuse

First thing we need is the make/ model/ year of the car. Do you have a factory shop manual? The manual lists "what all" is on each fuse. In most manuals, this is in the electrical (chapter 8) right before the diagrams begin.

First thing I'd do physically, is simply open the trunk and examine the harness all the way from the lamps to the point it leaves the trunk. Then pull the rear seat and see if it is pinching the harness. Then pull the left rocker, and follow the harness through there for sharp sheet metal cuts, etc.

Not sure, the cigarette lighter may be on that fuse.