The bad thing when they are in parallel, is that the motor with the bigger load will get more current and as a result the other one will get less current and could skip steps.
Ok, on to the new code.
When I purchase Steppers motors I do tend to buy the ones that have a cable plug in them.
The most common elements are capacitor, resistor, and battery.
R systemslave: It has 16 amps of dedicated power.
The first thing is to check continuity: find 2 pairs of wires, which are the ends of two separate coils.