The shop manual shows this fuse is for the parking/taillight's. Unfortunately this is a very long circuit going from all the way from front to rear of vehicle.
You will need to get a circuit breaker to do testing with, see if any of the bulbs look dimmer than the others while they are working. You will need to remove each socket, see if it has had water in it [rusted, corroded etc] and inspect the wiring [wiggle to see if shorts out] to each as far as you can see looking for the insulation being rubbed thru or burnt [especially next to metal body parts] pay attention to the brown wire.
You could find it right off the bat or could take hours.. don't forget license plate lamps.