Ok I need to hook up a resisitor box. I know the black wires go to the injectors and the red wire goes to the remaining wires on the harness. I have also looked at diagrams and pictures. What I dont get is when you take the multimeter and touch the spots on the harness to see which one are the injectors. Ive done this and the meter doesnt read anything. Does the battery on the car need to be on ? Does the ECU need to be hooked up ? ( took it off to get it chipped ) What exactly do I need to do right to get the readings ?