Minn Kota electric motor troubleshootin?

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What size would you recommend? The manufacturer told me to run a 50 amp fuse to the motor so I'm guessing just replace the old circuit breaker with a 24 v 50 amp one so that it matches my 50 amp fuse? Mind you that circuit breaker was there when I bought the boat, but at the time the boat was running a lesser powered trolling motor.
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