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If you want to rule out the 40amp breaker bar, re-wire the speed controllers to the 30 amp breakers on the other breaker panel. The motors will run with the 30 amp breakers, they'll just trip more often.
Your note about the left controller lighting up when no breaker was present is strange. Have you considered swapping out the motors? Or disconnecting the PWM inputs?
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Warren B
Pool Noodles. They're not just for bumpers anymore.
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