Does anyone know how many wires are soldered to the connector on the Advantage coils? I pulled the connector apart and see that there are 4 wires but only 3 are soldered to the connector. I can't tell if the black wire was soldered at one time or not. I didn't see any wire fall out either. It doesn't seem right that the wire would break close to the plastic and at the solder at the same time. Thanks !