Keeps blowing ignition fuse - 1996 Subaru Legacy

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.

Ignition Switch / Starter Fuse keeps blowing. - CarGurus

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CarGurusAug 14, 2010 - Ignition Switch / Starter Fuse keeps blowing. - I own a 2002 Ford Focus, 2.0l SPI engine. 5-speed manual trans. Recently bought from a friend's ...

Check this site for ignition fuse blow issues:

ignition fuse keeps blowing Car Forums and Automotive Chat

you have a short in that circuit chck your harness for wiring that might be exposed to ground or pinched

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.

when at startup or driving

try looking for a short in the wiring harness and do they run to the same fuse

It MUST be the starter relay coil - or the power wire that feeds it. Likely a short in the relay coil (AKA starter selenoid).

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