67 Dart electrical problem

My dart has no spark coming from the coil wire. My car has the original wiring harness with a Pertronix ignitor 1 ignition conversion. The ballast resistor wires have been soldered together so the ballast resistor is bypassed per instructions by Pertronix. Car ran great until recently. Found a light grey looking wire with no connector on it. Either the wire snapped in half or the connector snapped off. This wire was wrapped in the harness that runs from the alternator and picks up the temp sensor wire? I didn't find a matching broken end, so maybe there was a connector that broke off. Did this wire have a connector that went to the coil? The wiring diagram looks like it is saying there is a grey wire along with the wire from the distributor and the blue wire to one side of the ballast resistor? 3 wires total to coil in factory stock configuration? If so that could be my problem but I am a moron when it comes to electrical. Any help is GREATLY appreciated-trying to get my car running for Cruisin the Coast. Thanks. Picture is of back right of intake. Small block.