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The pics will help a whole lot but there has to be a short somewhere cause you are blowing a 50amp fuse...thats alot of current. Also if it is fused at 40 amps and it blows then putting a 50amp fuse in there will likely damage what ever it is hooked to. The fuse is there to protect the equipment now if you are putting bigger fuses in there then you are going to burn something up If you haven't already.
Just from what you wrote you should try to isolate each piece of equpment from the other and power up seperately, this will tell you if they all work individually, if they all power up then I would add one at a time until the fuse blows with the proper fuse being in there of course, that should tell you which component is causing the problem. Note: I would take them off of the power distrubution block and run striaght to the battery if you can, at least just to test it.
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