Okay, then you need to check the voltages on the back of the alternator to make sure the connections and wires are good.
You should have +12V on the large yellow wire and the orange/light blue wire at all times. With the key on you should also have +12V on the light green/red wire from the instrument cluster. If you don't have voltage on the yellow or orange wires the mega fuse might be blown.
There is a field test screw on the back of the alternator for testing, but you have to be very careful using it. When you ground the screw, it will send full current through the field coil, and the alternator should produce maximum output. However, the voltage will not be regulated, so the high voltage can damage other components. Therefore, you must have the screw grounded for only a very short time, like one or two seconds. Obviously have your volt meter set up and ready well before you do this.