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Hello Marcus, welcome to Just Answer, my name is***** will try to answer your electrical question today.
If the fuse is still blowing one of the wires is actually shorting to ground is this a metal box ? it's possible the neutral and black wire are skinned and touching each other or the metal of the clamp where they enter the box in the ceiling, I know you likely haven't moved them around too much, but if they were skinned some when they were installed it's possible they were moved some and are shorting now. I'd examine the j box in the ceiling thoroughly to see where the circuit is shorting out.