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Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Your motor has some associated circuitry that was probably blown out by the power polarity reversal applied to it. Not just the fuse, but something else, now is shorted out by the damage caused by that mistake.
To fix it, the faulty or damaged component will have to be located.
I'm not sure. I have asked that your question be transferred to the Small Engines category, but I am sure of that much since I am an Electronics categories Expert. Your question was wrongly sorted into Electronic Musical Instruments, but it will be reclassified soon, and then a Small Engine Expert will take up the case.
Having done all I could for the case, I have Opted Out, opening it to the Small Engines Expert that will take it up. Thanks.