Sorry - I understand now. 30A is the smallest, I think, they make. It's probably 200% too big for the jonboat application but it will still blow really, really quick if there's a short somewhere between the battery and the first fuse panel. I used 80A main fuses in the duck boat so I could put a fuse between the batteries and the starting current of the motor and put the motor behind the Off/On/Combine switch - it's only a F20 so it doesn't pull any more than that. I did it on both batteries so I could combine them if the starting battery is dead. Putting the motor behind the switch lets me turn everything off. If someone had a bigger motor they would probably still need to hook the motor directly to the battery.
There's a thread on another site where a guy's motor started itself a couple of times just sitting in the driveway - that's why I try to put the motor behind the switch and the switch behind a fuse - where possible. I don't have the big boat fused until after the switch. The switch still shuts the motor off but I didn't want to fuse the starting of a F150.
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