G'Day Lee, sounds to me like you're a bit low on voltage/current for the motors. I also had problems with stalls when I tried to run on a 12v car battery. I don't do that anymore.
Try using a 15v/3A supply from d1ck smith or Jaycar. That will fix the problem. The mount can take up to 18v without complaint and I have found this gives the motors more torque.
cheers, Bird
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