1977 cb750 k wiring and lights... how was it stock

Ok, I'm in the process of putting my cb750 back together and I've got an electrical problem.

1)When I turn it on, the neutral light turns on, and stays on. The neutral light stays on weather it is in neutral or not. But, it does get brighter when it's in neutral. Is it supposed to be like this? My guess is I have a crossed wire somewhere, but I don't want to go chase it down and find out it's supposed to always be like that.

2) What lights are supposed to be on all the time? I know the headlight is supposed to be on, but one of the turn signals is always on too. It also flashes when I turn the signal on, but the rest of them are off until I turn on the flasher. Are they supposed to run all the time as running lights or are they supposed to be off and only used as indicators?

3) Same thing with the tail light. Is it a tail light or just a brake light? Right now it's off until I hit the brake. Is that normal?

Thanks for your help.