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[Fiero 86🇧🇪]

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[melsg5]

Is that the factory radio?
Did somebody install an aftermarket radio and cut wires?

 

[Fiero 86🇧🇪]

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[melsg5]

Not knowing why you cut wires as opposed to using a wire harness adapter and not knowing what instructions or wiring diagram you used I can only guess something that you tapped into was incorrect and now some other wire broke or shorted.
Using a wiring diagram and a multimeter you have to check if the correct wires are supplying power both with ignition on and ignition off.