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Welcome, I'm Chris (aka Moose).
Just to make sure I understand, the fuse blows immediate when the key is turned to the run position?
Left side of the dash remove the ST and IGN fuses, tell me there amp reading and turn the key on, does the AM2 fuse still fail?
I do not like diagnosing what if and what if, that results in alot of extra work leading down a diagnostic path that is of no use. I am trying to find out which circuit has the short. It would be best to just reply later when you can and we will go from there.