ultimatehandyman shows you how to Rewire a fuse from an older style consumer unit. What you need: fuse from an older style consumer unit, a tester/screwdriver, fuse wire of right thickness1. Use a tester to determine whether your fuse is in working condition or not. Once you are sure it is not working unscrew the screws partially which are found on both ends. 2. Unwind the old fuse wire from the screws and remove. Take the fuse wire that is of same rating as the one you just removed. 3. Insert the new fuse wire into the fuse until it pops out the other end, now wind the fuse wire on both sides around the screws making sure that it is below the washer. 4. Cut of the excess bits of the fuse wire. Make sure the connections are all tight. Test whether the fuse is working using the tester. 5. Before inserting the fuse back into the consumer unit is switched off.