Ok, I got it.
What you've done is connect the red wire (postive) from the batts to the input pin of the regulator, then connect a wire from the regulator's output to the place on the circuit board where the red wire was going. Then, to ground the motor/FETs, you connected a wire from the ground pin on the regulator to one of the wires to the motor....have I gotten it straight?
Jesus, why am I still asking?