Standard Wiring Diagram Color Code. These are the most common color codes used in boat wiring. Green identifies ground all the time and yellow is switched to ground.
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Thus if stripe a is green b is grey c is red and d is silver the resistor is a 5800 ohm 10 unit. Other wiring diagrams on this site are listed below. Main lines are represented by l1 l2 and so forth.
I have fit them for over 15 years maintained and repaired countless others not installed by me and have never come across a standardised wiring system.
These are the most common color codes used in boat wiring. It also might be helpful in future to include a common wiring scheme for the 02 models eg. Trailer wiring diagrams etrailer com. A black dot can be used to suggest the injunction of two lines.