First we will connect the wires to the ECM side of the cable. Carefully strip an area of the insulation of the target harness wire by prying the insulation back without cutting any strands of wire. Then using the same twist solder and tape techniques as all the other wires, make the six connections. This is the most difficult step of the whole installation, as the harness is in a bad place to work comfortably. I found it easiest to kneel on a soft cloth just outside the open passenger door while leaning into the car to make the connections.