Found out through testing I have 2 potentiometers that when fully turned on stop engine from functioning. So I backed off both about halfway. Engines now work but sound is low. Question can potentiometer be bypassed for full volume without any negative effects? I never thought that potentiometer would stop engine from functioning.
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unless maybe one side of the potentiometer is touching ground ? doesn't make any sense i would check potentiometer to ground with ohm meter with board disconnected for continuity or short !