The architecture connects a power source to a plurality of electrical loads. The method is implemented automatically by a processing system and comprises the steps of obtaining (E01) data relating to a plurality of known electrical architectures, establishing (E1) a list of electrical components of the target architecture, determination (E2) of two tree starting points corresponding to a positive terminal and a negative terminal of a power supply source, construction of a power shaft starting from the first point of departure and construction of a mass tree starting from the second starting point. For the construction of each of the shafts, the processing system determines (E5) all components connected downstream at the starting point and generates (E9) electrical connections between the components of the tree according to father attributes and / or son of said determined components. A representation of each tree having the identified starting point, the determined components and the generated links is then generated.
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