Hi,
What motor encoder cable?
Why have you not posted link to specs/data of the motor?
Nema 43 means nothing when it comes to spec or type of I/O.
Nema 43 is a size format.
How about you now post a proper circuit diagram so we can see what your connections are now?
Where is your stepper in the images you supplied?
Please a picture of the stepper.
Tom.... 
