hi , coming from the scooter the plug with the red and green wires to it is the positive and negative , both of these on my sons bike are showing constant live ,12.78 v.. , it shows exactly the same when the ignition is on but rises when the scooter is started , the black box beside the wiring in the picture is the exact same box as ours and as far as my research has gone the wire with the bullet head is a direct link to the cdi , the cdi supposedly sends a pulse to the l.c.u through this box and varies volts depending on how high you are revving or if you pull up at lights it drops the current so that your headlights arent drawing 12 v , the other wires you see in the picture (the ones that are bridged) these i think are a direct current to the headlights , the site i stole that picture off gave the bridged wires as a solution to the headlight issue but im not sure just bridging wires is whats best for the rest of the wiring loom , i spoke with some people who own bikes and they said the direct constant 12v current to the l.c.u is right and that there is some sort of switch inside the box , it makes sense i suppose because the battery is never drained , id be more interested to hear someone who is more used to this sort of system to find out your views , and or if you think you could sort out some sort of relay system to save me a few quid lol ...thanks zombie and everyone else for your patience but if we can solve it im sure it will help alot of other people , if you google this problem there are alot of people with the same problem ...thanks..