Something I learned from John Parsons was the Delco shown and the 10,000 model Northeast distributor reversed polarity every time the engine was started. It took me a while to wrap my head around that. The condenser has two leads. The ignition switch only turns to the right 90 degrees at a time. Off start off start. It was done to make the points last longer. Look at a REAL wiring diagram for a late '16, '17' or early '18, it shows this.