1997 Nissan Altima Nissan Altima

A simple trick to finding a short is to replace the blown fuse with a pair of spade terminals, then use small jumper wires to connect them to a 12 volt light bulb. A brake light bulb works well. When the circuit is live and the short is present, the bulb will be full brightness and hot so be sure it's not laying on the carpet or against a plastic door panel. Now you can unplug electrical connectors and move things around to see what makes the short go away. When it does, the bulb will get dim or go out.

The circuit may only be live during cranking the engine or when the ignition switch is turned on. That's when the troubleshooting can be done. In this case the first suspect is likely to a wire that got pinched near the generator.