The dotted tracer marking look like the wires that go to the emission system. I wonder if it goes to the temperature sensor, part of the Electronic Spark Control System? The temperature sensor is mounted on the front face of the right door pillar, monitors the outside air temperature and relays this information to the amplifier. The amplifier, which is located under the instrument panel, controls the distributor modulator vacuum valve.
Damn you just beat me to it. Those colors look familiar, and the temp sensor on the right A pillar near the hinges popped into my head.
If that's what it is, I guess I can ignore it. There isn't anything on the front face of my right door pillar, didn't see anything under the instrument panel that might be an amplifier, and I'll use manifold vacuum for the vacuum advance. Thanks.
I did see a red/yellow in the wiring diagram that said 'to emission control', but it's the brown/yellow wire in my 73 harness that goes to the firewall bulkhead connector and into the engine bay, so I didn't want to throw any potentially invalid information into the thread. Of course they are labeled differently between the 72 and 73 diagrams, but both tagged as red/yellow.
