Why would the ignition starter fuse in a 2002 grand am blow when you start the car?

what size fuse is it it would need to be a 30 amp fuse for the starter solenoid after that your starter solenoid could be shorting if you take the wire that comes from the key off the starter (normally the small wire on its own going onto the solenoid on top of the starter)then turn the key same as if you were starting the engine if the fuse doesn't blow then you need a new solenoid for the starter or a new starter if the price is right

if the fuse does blow with the wire off the solenoid then you have a short in the wiring loom check the loom for break or cracks there is a good chance the wire is after wearing against the engine somewhere if this is the case tape it over and tie it back from the engine