Wiring / Electrical question - Newbie

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Hi, I am working on my Parent's Model A that hasn't ran for a long....time and I need some help on the wiring. I ran some new wiring (don't worry I'll tidy it up once it's working) but I'm not familiar with 6 volt positive ground systems and have some questions. The first thing I couldn't figure out is why when I ground a test light to the engine and put the probe on the coil it always has power whether the key is on or off. This seems wrong to me. Also I replaced the ignition switch, but based on the wiring diagram it doesn't appear to be a basic switch. And there seems to be 2 wires running to the distributor - see picture. Will this work? I have the power from the starter running to the ammeter, then a wire running from the 2nd terminal of the ammeter to the one side of the coil, the generator, and the steering column. Then a wire running from the 2nd side of the coil to the ignition switch, and from the other side of the switch to the wire running to the distributor. And nothing with the hard single wire. Make sense?
Thanks
Darren