12 V DC basics

Generic recreational DC systems commonly contain:

battery bank

battery switch or isolation system

charging source

distribution panel

overcurrent protection

positive conductors

negative return conductors

loads

Safety concepts:

isolate power before service where appropriate

protect circuits against overcurrent

keep terminals clean and tight

use marine-suitable components

address corrosion

do not substitute automotive wiring practices blindly

follow the vessel wiring diagram

Outrun diagrams should show conceptual architecture, not claim all vessels are wired identically.