greenwing

I have had similar difficulties in reconstituting the lights on my 1972 MAR. All the original wiring has been stripped so I am starting from there. What I have noted is that there are 5 wires coming from the motoplat, blue, black, whit red and green. The blue and black go to the coil which would seem correct as the bike starts and runs very nicely. There was no provisions for a battery in this bake, no voltage regulator and such. I assume the lights ran of unrectified AC power. From what I have been able to infer from my investigations are that the white wire might supply power to the headlight, the red wire might power the tail light and the green might power the brake light ( though I see to accommodations for a brake light switch). I assume the power return is through the frame and engine back to the motoplat. I have been unable to find any corroborating information for my observations. Would any one be willing to enlighten me?