Purple, not sure if your "whoops" means your bikes headlight actually comes on with the key or not. If it does not please confirm the year of the bike and tell me the color of the wires going to the rectifier regulator? Are there 3 white and one red wire - or are they: white, yellow, brown and red? I have a few conflicting schematics I'm trying to associate to the correct year bike. Thanks... (if you don't have the time no problem..