Puch 7-Wire has 4 seperate +6 volt feeds. At least at the connection block and cable harness.
Grey to tail lite
Green to brake switches
Yellow to headlite switch
Blue/Black to horn switch
Unless two of four wires feed from the same magneto coil then I'll have 4 magneto coils and then the possibility for the 180 degree out-of-phase condition is greater. Also the "possibility" of converting the lights to 12V exists if the charge is great enough (which I doubt). My current 6v 21 watt headlite and 6V 10 watt tail lite dim at idle. Ya can't make chicken salad out of chicken.......poop. <---replace with appropriate colorful metaphor.