i need to find the fuse for the amp in my sreg ford galaxy?

trying to mfit new head unit, all gone wrong, found amp and now found the speaker wires that plug into the amp, so unplugged and tested to see they were def speaker but 1 of them sparked'so now have no power to head unit, i'm asuming it blew a fuse but can't find it in manual, the head unit was not connected at the time, thats the only thing differant to what i did before when the head unit had power but no speaker connection, please help