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If you can jump it and it starts, no it won;t be a fuse.
It can be a bad battery pulling the amps away from the other batteries or a bad alternator with a bad diode that is draining the batteries down as the truck sits.
Start at basics and check the batteries by load testing them all to see if any are bad, then check the alternator. Bench testing at the parts store will work if needed or if able to start the truck, can be done on the truck with a alternator tester.
Most likely you will find a bad battery pulling the other batteries down. A plate is most likely cracked in the battery which will give enough to power items on, but not enough amps to cranks the battery. Bad or cracked plates steal amps, but show good volts. This is why load testing is best.
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