There’s a problem with fuses. On the face of it, testing would seem to be a one-shot deal — exceed the rated current and see if it blows. But once you know the answer, the device is useless. If only ...

I've had my car (07 Kia Spectra) for a few years now, and the accessory plug has never worked. It didn't really bother me, but I decided to look into it. I checked the fuse and it was blown. I ...