Hi , i can take some photos of my wiring if that helps , ive just had to resolder some of mine aswell. My bike is an 04 rev3 250 that i got on gumtree as a basket case , im sure it never had the brown wire either , the red wire on mine goes to the coil aswell. I noticed you said you tried refitting the kill switch but did you try for a spark with it unplugged ? I actually found your thread via gumtree , its a nice bike with some nice upgrades , seems a shame to sell out of frustration.