How to hook up another stepper motor.

The side of the TB3 has 4 pins on the AUX Step Motor port that are visible.  From left to right on our standard , these connect to our standard jumper like so.

Black - A
RED  - A'

Orange -B
Yellow - B'

There is no worldwide standard on wire color unfortunately. You will have to test the wires with a multimeter on the motor. Figure our which pairs are connected but have resistance. For example if you had RED,BLUE,GREEN,BLACK on your motor and RED and GREEN had resistance, they are a pair. You would also find that BLUE AND BLACK would be the other pair.

Once you know your pairs on the motor, then these need to connect to the jumper wire pairs. ON our stock jumper wire, the pairs are in order Black Red Orange Yellow. Black and Red are a pair, and Orange and Yellow are a pair.

So the following would work in our example:

RED motor --> Black Jumper
GREEN motor --> Red Jumper
BLUE motor --> Orange Jumper
BLACK motor --> Yellow Jumper

Note that polarity doesn't matter. If you flip any pair you get a direction change on the motor.

Original example - let's say it turns clockwise by default.

RED motor --> Black Jumper
GREEN motor --> Red Jumper
BLUE motor --> Orange Jumper
BLACK motor --> Yellow Jumper.

This would turn CCW by default since I flopped the Green and Red motor wires.

GREEN motor --> Black Jumper
RED motor --> Red Jumper
BLUE motor --> Orange Jumper
BLACK motor --> Yellow Jumper.

In fact many iterations will work. Pololu does a good job explaining it here - http://www.pololu.com/product/1200/faqs