Ford puma keeps blowing ignition fuse why ?

puma ran fine today stopped at a shop turned it of my daughter put the stereo on when i was in the shop when i tried to start it the fuse had blown changed fuse car started fine why ???
Ford puma keeps blowing ignition fuse why ?
if u can look behind the fuse box to see if every thing ok and nothing burnt out there suffer with faulty fuse boxes dont worry if it is get a second hand one and a garage will fix it for about 30 quid

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