Hi, I need help with an electrical diagram for a 78 bultaco Alpina 250. There have been many years and a house move between pull down and rebuild. Something has gone missing. I have no spark, and only have a wire from the case to the coil, not sure what else is needed. Should it have a relay or not? I tried to run a kill switch staight to the coil, that didnt work. Anyone know what should be done? Even if I can get hold of a photo copied diagram of the electrical system it would help. Thanks.....