Sounds like your endstops are connected to - and + on your PCB. When you trigger the endstop you are tripping the fuse. Connect them to - and S(ignal).
Not sure if its because I bought the components from Netherlands, both the motor and endstop wire colours are different from the prusa manual!
It's because you didn't care to compare the pinout of each connector and what each wire means. Currents and voltages don't care what the colour of their wire's isolation is, right?