NSN installation manual says that there are "bundled red wires with the injector wires". I do not see any red wires at all. I also think that it is just supplying the injectors with power, and the blk/ylw orng/ylw, and ylw orng wires are the switched grounds. But there is already power to the injectors....... Right? no need to worry about these "red wires"? Please help