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Let's work backwards until we find the problem... With no power connected to the bus bars at all, turn on the 12v power to the control board. Measure voltage across R16 when there's zero throttle and slowly increase throttle. What happens? It should start at 12v, and then go down to zero volts briefly, and then back to 12v, and one of the LEDs should blink fast.
Next, CAREFULLY measure the voltage from Pin 2 to pin 3 of U6 while throttle starts at zero, and increases.
Next start at zero throttle, and gradually increase throttle while measuring voltage across R12. What happens?
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