GS, You don't mention what size wire the original leading back to the battery is or the fuse size. But, at some point you're going to start overloading that lead in both those areas. Best way to handle it is to use the original lead wire as a "fish wire", attach 2 larger gauge wires to it(one hot and one ground), and pull through so that you now have a sufficient size wires to feed several devices. Then someplace inconspicuous, install a buss bar/fuse block to wire all your devices into each with a dedicated fuse and do away with the inline fuses to each device but sizing the correct fuse on the block.
The way you're attempting to operate them will draw too much current and start blowing fuses. The easy thing to do is to oversize the current in line fuse but then you're not protecting your electronics to the manufacturers specifications.
I'm sure you probably already realize that this is the right way to do it even though it's not the quickest.
Good luck
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