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You have a direct short to ground on that power feed circuit . You need to find a power distribution diagram to see what all gets is power from that fuse . Isolate the circuits till the fuse doesn't blow any more , then trace out that circuit that blows the fuse .
Which Ignition fuse ? Which fuse box is it in ? under hood , passenger compartment ?
IGN A
40A
Ignition Switch RUN, START, RUN/START/ACCY
IGN B
40A
Ignition Switch RUN/ACC, RUN/START
Could be ignition switch problem , Chevy has had problems with them .
You may have an open circuit or short. Short at the module and work backwards following the wires looking for and issues like bare wires, pinched, cut or even burnt.
If it's the main Fuse, rated above 40Amps, then usually only two components are directly connected to this circuit. The starter motor and the alternator. Both can get critical short to ground, that may blow such fuse.The thick battery cable goes directly to the starter motor and a smaller high amp wire is looped from there to the alternator. Third less likely would be main supply to ignition key switch.
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