Ive fixed a few of them. The issues Ive seen are the handles skip so it gets a weird voltage at start up or no voltage at all. The pots get bent on the brackets and they turn any more, or the FETs blow in which case you get a direct short tripping the 12 amp breaker or you get nothing when you move the throttle. It all depends on how the FETs fail. I have 2 of them and have had no issues with either
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