Yes the car was running fine with the 318 in it with the old harness. In August 2019 I took a 1970 340 in to get rebuilt and put in this 69 Dart. The shop was busy and it took 14 months to get the car back but just before it was finished when he was about to start it for the first time the harness shorted out...I wasn't there at the time. It was repaired with some wiring from a dodge Van as far as I know. After that this over charging issue came up as soon as it was started. He's changed voltage regulators and alternators. witch doesn't fix the problem. I'm sorry for going all over the place in my head with this...But I'm thinking the most sensable thing to do is take the grimy old harness out of there and get a painless or kwik wire kit put in it
