Even though he (earlymopar) posted right after you posted that photo, he's talking about the diagrams back in post #2358481 - 08/23/17 08:57 AM.

To be clear, I'm not aware of a parallel wired circuit from the factory. Chrysler normally ran the Battery and Alternator wires to the bulkhead connectors. In some heavy duty applications, they ran those wires through the firewall. This eliminated any possibility of poor connection or higher resistance at the Packard 56 bulkhead connectors.