Why oh why would someone do this? Fuses are made that if a short occurs in a wire going to the fuse box the fuse is “tripped” to disconnect the flow of power and stop an overheat. It may have seemed like a good idea at the time instead of buying a new fuse just put some old wires inside and reinstall them in the fuse box.
PLEASE please don’t rig your fuses they are made to fail for a reason. New fuses are cheaper than buying a new car after a fire!