67 Barracuda Ignition Issue

Thanks everyone for your replies. I replaced the J2 wire and the run voltage at the coil positive is just over 6 volts. The start voltage comes in at 10.7 volts. Car starts and runs with this set-up. I tried fishing the old J2 wire out of the wiring harness by peeling back the harness casing slowly and carefully. Starting at the coil positive pulled out the wire and got back behind the distributor and then the wire went into an even bigger clump of encased wires. The wire looked fine up to that point. Rather than digging the old J2 wire out any further, I coiled it up and taped it up there. My new J2 wire is spliced in about 6 inches from the ballast and is taped up to the harness along the firewall and back around to the coil positive. I have run the engine both hot and cold for over an hour at a time with no further issues. Any issue with just leaving the old J2 wire in the harness? I have to say the last 24” of the old J2 wire buried in the harness has my curiosity up. The wiring harness is fairly new and there is no visible damage that I have observed. So it seems like there is a bad splice (unlikely) stuck in there somewhere, or the wire got damaged (heat maybe) and failed somewhere in the harness.