Boat wiring diagram?

[Skools Out]

i always go buy a 12/3 or 14/3 100ft drop cord and cut it for all my wiring. that way you have an extra wire at all accessories. it's plenty heavy enough wire and it's oil and gas safe. just count how many you need to the back and write on the wires with a sharpie marker what they are and pull all at once then run your front wiring. One 100 ft cord will rewire your whole boat and they are cheaper than reg wire. just crimp on the ends and go.