The mystery circuit

[*rfaulk34*]

The outside outlets are wired in series off the GFI. When the GFI blows, it only blows that outlet and anything behind it. There's still power coming from your breaker box to the GFI it's just being stopped by the outlet itself. If you reset the GFI and plug your radio in with it turned on, you can test each breaker in the box and when the radio goes off, that's the one.