Scootergrisen

hi all , im new to the forum , ive found lots of great advice already so thankyou , i wonder if anyone can help me with this problem i have , my scooters headlight had blown and thanks to this forum i found out that it was the light control unit , it had burned out , i checked the fuses and noticed one of the 7amp fuses on the red wire had blown so i removed parts til i found the problem, now i checked the two wire plug that attatched to the l.c.u and it is constantly live even without the ignition on , i have stripped the bike and cant find a short ...i have added a picture i had seen on the internet as an example , this is not my bike but has the same wire set up any ideas would be great ...thankyou ..