This is a power supply for recharging a small portable vacuum cleaner that you there's a 12 volt sealed lead acid battery. The cord has been rather badly chewed up. I would like to say by squirrels or rats, but in fact it was kittens. And yes, we have taken precautions to be sure the kittens don't chew up any 120 volt line cords. The power supply is sealed rather tightly and very crowded inside. It's not very practical to replace the cord. We believe the fuse has not been blown. It should be possible simply to repair the cord by shortening it. So we go along the cord finding the damaged areas and selecting large sections to cut out. The specifications on the power supply say that it's a positive center. We cut the cord and strip it and check it to find out which side is the positive.