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If it's just surface rust you can clean the contacts , use wd40 or ? and a piece of red scotch brite and a small screw driver , it's a pain to do but works . if you have a spot sand blaster you can put glass beads in it and hit the contacts with low pressure .
as for replacements time to hit the junk yards and trucks being parted out or switch it to a new style painless fuse box .
Thank you i will try cleaning it after I took it loose and looked it dosent look as bad as I thought but I have no power in the box I have my wires hooked to the solenoid any ideas on that what wire is supposed to supply the fuse box with power ? Thanks