1980 Peugeot 103 Electrical (click on pics for larger views)

Ground wires are yellow/green, the three pole plug is white to white, black to red, and silver to brown. The white, red , brown end goes up to the headlight. On the other side of the plug, the white, black and silver (and a yellow/green) come up from the magneto. The black on this end of the plug actually comes up from the magneto to the coil and then another wire segment goes to the plug.

Inside the headlight. The headlamp has a black frame ground wire and a silver wire jumped off a 3 pole plug.

The Headlight switch has a brown, blue and white which came from the headlight 3 pole plug.