The YNZ harness? The harnesses they sell are appropriate for the application. A harness for your '47 would be made of the same gauge wire as the factory harness, appropriate for 6v. Since 12v pulls less amps it will work well for 12v as well.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.