I turned the key in nothing happens

I I have a 2000 Craftsman riding lawn mower that won't start I turned the key in nothing happens it was running good and all of a sudden it just quit and didn't start anymore the motor turns good if you turn it by hand I replaced the solenoid and the starter and still won't do nothing it's like I don't have fire two the ignition how does the wires go onto the solenoid you have two red and then the negative black I can't remember how they went and which side they went on