Matty, the color of the wires should not change in a single run plug to plug. However ground wires can have several colors, and the color can be different on the connecting plug. For example on the B22 connector are the following ground pins/colors: 3/BW,15/BW, 13/BY,14/B,16/GW, but on the mating E3 connector on the engine the colors change to 3/BR, 15/BL, 13/BL, 14/BY and 16/BR. I spent many hours making a mapping table but it still has some open items that need resolving i.e.: fuel and A/C connections (see may last post).