I've done some modifications to my mostly CB500 and It's been so long getting it together a few things have slipped my mind in the lighting area.
Main thing is the tailight, it isn't stock but I've used the wires and socket, I'm aware it's dual filament but it doesn't Illuminate during normal operation, but lights up when I apply the brakes, I can't recall if this is normal just seems like it should be on as a running light as well.