all electricity shuh off in my 1985 Porsche 928

You must have shorted something by touching a wire. ONLY replace fuses with the CORRECT AMP same fuse. By using a larger amp rated fuse you have the risk of melting wires and destroying your car's entire electrical system! You should only have power to the radio with the ignition key in the "Accessory" position or when the car is running. Check ALL the fuses with a fuse chart (owners manual) and make sure they are correct size and all good. You mentioned the radio "was working". Perhaps you've tried to install a radio that uses too much power? Remember this car is 1985, so make sure the radio spec power requirements aren't too much for the rated fuse.