Are there actually 3x 293s on the shield? I wonder which one is proving the power to the connector you're using for the motor.Apart from that, are you enabling the motors though: you need 5V on 293 pin 1 for a 293's "left side motor" and 5V on 293 pin 8 for the "right side motor". I don't know which Arduino pins those translate to.And then you need high/low or low/high on 293's pin 2/7 for left side and 293's pin 10/15 for the right, whatever Arduino pins those connect to.
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