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Test the alternator output with a multimeter, then test the battery's charge voltage, finally test the voltage at the fuse box. If the fuse box is seeing the alternator's output voltage but the battery isn't, then it's probably a fuse issue; If the fuse box isn't seeing the alternator output then it's a fusable link issue. Yes, you can straight wire from the alt to the fuse box, just make sure you use 4ga or better with minimum 140amp fuse; or you can just straight wire it without the fuse, lots of people do it, but I highly recommend the fuse.
 
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