If you really are concerned about fuses and their contacts, good or bad, replace them again with the EZ-ID or Smart-Glo kind that will light up when they pop. Makes tracking down a problem so much easier, and they aren't that much more than the regular ones. Readily available at auto parts stores.Top left is a new one for reference. I replaced all my fuses after I pulled one and saw the corrosion. Here is what they looked like.