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I have a couple fuses that fit loosely into the interior fuse panel. They fail to complete the circuit sometimes due to their loose connection. Bending the prongs on the fuse has helped some.
the fuse obviously has not changed, so the contacts in the box must be damaged or bent. A cheaper way to get around this might be to melt a big drop of solder on each fuse leg so it will wedge into the box contacts ? ......... other than that, your stuck removing and trying to "fix" or replace the box.