those parts skunk listed will work fine. Mercruiser uses a 90 amp fuse to the accessory feed on sterndrives. Most older outboard boats i work on aren't fused at all. I believe(IIRC) USCG requires a fuse within 18 inches of the power feed. SO its always a good idea to use a fuse or a breaker coming out of the battery switch. Like Skunk said, the face mount breakers can be used as a switch. I prefer not to use that type in this application as they can be tripped easy unintentionally( they do have their place). I prefer fuses as I keep a box of spare fuses on board, you get a bad breaker, you're stuck. I can feed it fuses of increasing size till I'm at the dock where I can do a more permanent repair.
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