54 Plymouth 6 voltage system to a 12 voltage system

Yes, that is correct. Honestly, it is not like i drive the car in the wet and cold with the blowers and wipers running all the time. I had thought about putting a ballast resistor in their power feed to drop the voltage down to 8 - 10 volts and may do that this winter.

Yes, I know that there are other ways to build the power supply, but you can but the USB adapter at any grocery store checkout for a couple bucks. It was just more convenient, LOL.