Looks like someone has cut into the green wire with the brown for the headlight mod as you said,looks like you need to reconnect the green wires to get the normal light setup.I'm guessing the brown wire connected to the green goes to the back of the headlight bulb connector if this is reconnected the green the headlight mode should work. 
Also check the tail light bulbs as it is a double element & the one for the rear maybe blown.Bulbs required is a 12v,21/5w make sure you get the ones with the offset pins on bulb base.
Also check the tail light bulbs as it is a double element & the one for the rear maybe blown.Bulbs required is a 12v,21/5w make sure you get the ones with the offset pins on bulb base.