They are marked on your main map by a small green dot and on the mini-map with the green fuse icon. Five fuses will be automatically added to Lincoln's inventory after completing Thicker Than Blood and John Donovan will give him another three in The Way of Flesh.
- There are 544 fuses spread throughout New Bordeaux, counting the eight given to Lincoln. 267 of them will be needed to wiretap all junction boxes, leaving 277 extra.
- There is a fuse in Tickfaw Harbor located on a dock to the northeast inside a shack that will not show on the map, as it's outside the portion of the district that's covered by wiretapping.