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The ABYC would give you coloring codes as well as the gauge of wire+length of run+amps used. I have had great success with Blue Sea product line and used tinned wire with heat shrink fittings (I actually got rid of my automotive fittings and use marine grade heat shrink everywhere). Get a heavy duty crimper and in a pinch I use wind resistant log lighters for the shrinking. Good luck and welcome.
Garris