Is it fuse 12 that blows?
Is fuse 12 25Amp?
Does the fuse blow AFTER you turn key to run?
Do you have a multimeter?
with fuse 12 pulled, key at run,
on VDC, measure terminals and verify ~12VDC on one side and 0 VDC on the other
On Ohms, measure the fuse terminal that had 0 VDC to ground and verify the resistance is above 0 ohms, I don't know the gauge resistance, but if it is less say 10 ohms, that still would only be a couple amps
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