I decided to only replace the wires that needed replacing at the moment to keep it as original as possible. Some wires had already been spliced, so those may need attention depending on the security of the splice. So far what I've seen they are just wrapped together and taped up. I prefer solder and shrink tube if I have to splice.
I took off the rear fender for the first time last night. There was 50 years worth of dirt and grease under there that had to be mucked out. It was much easier to run the wiring with the fender off. Anticipating the need to remove the fender to change the rear tire, I used two barrel connectors to attach the stop and tail light wires; naturally installed in opposite directions so I don't mix up the wires.
The horn and brake light switch got hooked up too. I modified the wiring slightly from stock and ran the stop light wire down between the electrical boxes to the switch rather than in the right one and back out again. Because of the heavy insulation 105'C MTW wire I'm using it just made more sense. BEEP BEEP! That works.
The adventure came when trying to get the oil and charge indicators to work. The charge indicator had a spring left in there by someone who thought they were going to fix it. It ended up shorting out the connection inside the bulb holder and kept the light from coming on. With that removed and cleaned out with a little bare hookup wire wrapped around the bulb for extra contact along the sides the red charge indicator worked fine. (Is it supposed to be the red one?)
The oil indicator threw me for a little while before I realized that the bulbs are only 2.5v and there is an integral dropping resistor wrapped around the bulb holder fixture.... and that some genius while trying to test the bulb (me) had vaporized the end of the resistor wire. They say its the same bulb holder used on a Rover P4 (Like I'll ever find one of those in the states). A dab of solder fixed that up and I have an operational oil pressure switch light. It felt re-assuring to turn on the new key, and see indicators lamps smiling at me.
The next step is the scary part. When I fire it up, will the indicators go out? Will it charge the battery and is there enough oil pressure. I'll try that this weekend.