Join Date: Apr 2006
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Re: Need help with wiring boat.
Each power source (battery, alternator, shore power charger, etc.) should have a fuse located on the output, and fused at whichever is less: The size of the load it is connected to, ~110~120% of the maximum output of the device, or the ampacity of the wire. This last is based on the wire size and type and can be looked up online.
Forget the *switch*, you don't fuse power sources there. You fuse them at the source.