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Fresh starter might be bad. Especially if it's a rebuilt one. To blow the 400A mega fuse it takes a dead short to ground.
No other circuit in the car pulls more than 40A and they all are fused separately.
Plus something else would short when key is in run position.
Make sure starter connections are not shorting out.
Since it's a friends car are the battery connections on right and not reversed?
 

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Premium Member
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I would try another starter and disconnect the positive wire to the alternator after changing the starter and before testing the starter to see if it cranks OK. Then reconnect alternator and test again.
Not likely a dead short in the alternator but anything is possible.
I don't have your car but usually the mega fuse is replaceable , it is in my cars.
 
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