Despite popular belief, there are no standard wiring colors for each wire in a car. The specifics of the wire coloring are dependent on the make, model and even year of the specific vehicle under consideration. The best way to determine how to know the appropriate wiring colors is to learn the basics of reading a car’s electrical diagram.
A basic electrical diagram has four symbols. These symbols represent the switch, battery, resistor and ground. Additional symbols represent variable battery source and the case ground. Advanced diagrams also will indicate the amps and circuit path. These symbols are universal, and memorizing them or having a copy handy is the best way to make sure you are looking for the right information.