- No sleeve on a wire of which only the serves as a reference marker : reference on diagrams : F.Gr, F.Ve, F.Bc.... - Coloured sleeve on a wire whose also serves as a reference marker : reference on diagrams : FN-Bl, F.Ve-Bc.... - Wire without a reference marker : This is a wire whose position cannot give rise to any confusion. - IMPORTANT : The references for the parts and harnesses are arbitrary : they are selected solely to enable the diagrams to be used. In reality the of the and wires are the only references used on the wires making up