When it comes to blown fuses the way you find the root cause and the way it's repaired is handled about the same on a 65 GTO as on a 2012 Chevrolet Malibu. Regardless A popped one is a sign of electrical problems. Often vehicle owners and mechanics alike will just go ahead and replace the fuse without looking further for any electrical problems.
This page talks about how to handle a burned fuse. The vehicle manufacturer sets the fuse amperage value at more than double what the circuit would normally carry. If a fuse blows for a given circuit, you can almost guarantee that even if the problem is intermittent that you will see the same fuse fail again.
Note: I added a video below that walks you through the procedure I use to hunt down electrical shorts. This is not the only thing that will blow an automotive fuse but it is a common cause.
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