No power to garage after cleaning fuse contacts and shorting a main circuit
You probably blew the cartridge fuse, the one that looks like a shot gun shell,  non contact testers may see a voltage on an opened fuse of this type as the material inside to reduce the arc flash can be slightly conductive, no real current is available but enough voltage to trip the non contact tester this is why nothing is working. Try replacing the fuse or get a volt meter and measure across the fuse a good fuse will show 0 volts across it but an open fuse 120 across.