Posted by MarkB_MI on January 03, 2020 at 04:16:20 from (174.230.24.5):
In Reply to: Melted fuse posted by ztw2009 on January 02, 2020 at 20:19:58:
That happens when the contacts become corroded. If there was one ohm of resistance between the fusebox contact and the fuse, at only 10 amps that would be a whopping 100 watts heating up the fuse.
Although you can measure the resistance across each fuse to see what the contact resistance is, it's tricky to measure low resistance with a typical multimeter. Alternatively, you can energize each circuit and see if you can measure any voltage drop across the fuse for that circuit; if you see even a tenth of a volt, that's enough to be concerned about.
I wouldn't bother with multimeter checks, though. Pull each fuse and inspect its contacts. If you see bright scratch marks like you see on the unburned contact in your photo, then it should be fine.
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