Amature Wiring Diagram. I Need Help.

You have a triple switch, and usually you can feed each switch with a separate wire from the DC fuse panel. I have the same switch panel, oddly... I would feed a separate line from the fuse panel to the switch panel for each basic load, one for the ceiling lights, one for the outside light and one for the water pump. I would use no smaller than 16 gauge for the lights, and 14 gauge for the water pump. I would use a 15 amp fuse for the water pump, and probably 10 amp fuses for the lights. Always remember that the fuse protects the wiring, not the load. Always match all of the wire in a circuit to the fuse that protects it. You have 20 gauge wiring to the loads, which is rated for only 7.5 amps, but are protecting it with a 15 amp fuse.

Brian