[Jon Stratis]

What are the lights on the speed controllers doing when this is happening? That can tell you a lot about where the problem is - if the lights show movement, then the problem is likely somewhere in the control path - a shorted PWM or some shavings shorting something on the roboRIO pins. If the controllers show no signal (flashing orange), then the problem isn't in the control wiring - look for a short between the controller and the motor, compounded with another short elsewhere that's allowing the motor to get power around the speed controller.