Gasgas.es has most of the manuals on it with wiring diagrams. That is where I got mine from in the past.
Hi, mine's a 2004 model, I downloaded the 2004 manual but unfortunately it doesn't include a wiring diagram.
I did a bit more digging and this is what I found...
2004 Manual - No wiring diagram.
2005 Manual - No wiring diagram.
2006 Manual - Wiring diagram but it's blurry/low resolution can't read wire colours.
2007 Manual - Wiring diagram but it's blurry/low resolution can't read wire colours.
2008 Manual - Wiring diagram but it's blurry/low resolution can't read wire colours.
2009 Manual - Good wiring diagram, everything is clear.
Here's an image of the EC wiring diagram from the 2009 manual, but I can't post it at full resolution...
Interestingly in the bottom right hand corner it's labelled as the 2006 diagram.