Join Date: Apr 2006
Thanked 173 Times in 170 Posts
Rep Power: 12
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.