If you have everything unplugged, and your still blowing the fuse, then you have a short to ground somewhere. Here is a picture of the schematic, not really that much going on in this system. I would be checking the main starter wire for chaffing along with any other wires in the area, including the wires coming out of the fuse box. And see if you can at least hear the starter relay click when you try to start it. If you can't hear it, try swapping it with another relay in the fuse box that doesn't have an important function, like fog lamps, or the horn, temporarily of course. If you get tired of blowing large fuses, you can get a circuit breaker of the same amperage at any parts store along with some wire and blade type terminals, and you can insert the blade terminals in the sbf number 4 slots and connect it to the circuit breaker. And inst of blowing a fuse all the time, it will just reset automatically. just make sure it doesn't get too hot. I hope this info helps!
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