Minn Kota electric motor troubleshootin?

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I think my only excuse is I'm not an electrician: ) Plus I had heard that when you're charging your batteries all at once (I have an on board charging system) that you want each battery to be charged separately, by me installing that in line fuse, I'm able to disconnect the two batteries to allow them to charge on their own. Not sure if it's a real issue, but it's worked for me so far. Also the current circuit breaker on there was existing from the old trolling motor, I didn't know what it was, and from the sounds of it it's not able to handle the new trolling motor.
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